zed 0.82.2

Merge pull request #2371 from zed-industries/refresh-entry-delay
Restructure background scanner to handle refresh requests even while scanning directories
2023-04-13 12:50:49 -07:00 · 2023-04-13 12:49:52 -07:00 · 2023-04-13 13:53:57 -04:00 · 2023-04-13 10:52:39 +02:00 · 2023-04-13 10:50:15 +02:00 · 2023-04-12 13:31:19 -04:00
375 changed files with 22481 additions and 8411 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -518,6 +518,7 @@ dependencies = [
 "menu",
 "project",
 "serde",
+ "serde_derive",
 "serde_json",
 "settings",
 "smol",
@@ -784,6 +785,7 @@ dependencies = [
 "gpui",
 "itertools",
 "language",
+ "outline",
 "project",
 "search",
 "settings",
@@ -1097,6 +1099,7 @@ dependencies = [
 "ipc-channel",
 "plist",
 "serde",
+ "serde_derive",
 ]

 [[package]]
@@ -1111,7 +1114,6 @@ dependencies = [
 "futures 0.3.25",
 "gpui",
 "image",
- "isahc",
 "lazy_static",
 "log",
 "parking_lot 0.11.2",
@@ -1119,8 +1121,10 @@ dependencies = [
 "rand 0.8.5",
 "rpc",
 "serde",
+ "serde_derive",
 "settings",
 "smol",
+ "staff_mode",
 "sum_tree",
 "tempfile",
 "thiserror",
@@ -1188,7 +1192,7 @@ dependencies = [

 [[package]]
 name = "collab"
-version = "0.8.0"
+version = "0.8.2"
 dependencies = [
 "anyhow",
 "async-tungstenite",
@@ -1228,6 +1232,7 @@ dependencies = [
 "sea-orm",
 "sea-query",
 "serde",
+ "serde_derive",
 "serde_json",
 "settings",
 "sha-1 0.9.8",
@@ -1269,6 +1274,7 @@ dependencies = [
 "postage",
 "project",
 "serde",
+ "serde_derive",
 "settings",
 "theme",
 "util",
@@ -1327,6 +1333,47 @@ dependencies = [
 "theme",
 ]

+[[package]]
+name = "copilot"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "async-compression",
+ "async-tar",
+ "collections",
+ "context_menu",
+ "futures 0.3.25",
+ "gpui",
+ "language",
+ "log",
+ "lsp",
+ "node_runtime",
+ "serde",
+ "serde_derive",
+ "settings",
+ "smol",
+ "theme",
+ "util",
+ "workspace",
+]
+
+[[package]]
+name = "copilot_button"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "context_menu",
+ "copilot",
+ "editor",
+ "futures 0.3.25",
+ "gpui",
+ "settings",
+ "smol",
+ "theme",
+ "util",
+ "workspace",
+]
+
 [[package]]
 name = "core-foundation"
 version = "0.9.3"
@@ -1739,6 +1786,7 @@ dependencies = [
 "log",
 "parking_lot 0.11.2",
 "serde",
+ "serde_derive",
 "smol",
 "sqlez",
 "sqlez_macros",
@@ -1926,6 +1974,7 @@ dependencies = [
 "clock",
 "collections",
 "context_menu",
+ "copilot",
 "ctor",
 "db",
 "drag_and_drop",
@@ -1947,6 +1996,7 @@ dependencies = [
 "rand 0.8.5",
 "rpc",
 "serde",
+ "serde_derive",
 "settings",
 "smallvec",
 "smol",
@@ -2100,6 +2150,7 @@ dependencies = [
 "project",
 "search",
 "serde",
+ "serde_derive",
 "settings",
 "sysinfo",
 "theme",
@@ -2296,6 +2347,7 @@ dependencies = [
 "regex",
 "rope",
 "serde",
+ "serde_derive",
 "serde_json",
 "smol",
 "tempfile",
@@ -2582,9 +2634,9 @@ dependencies = [

 [[package]]
 name = "glob"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
+checksum = "d2fabcfbdc87f4758337ca535fb41a6d701b65693ce38287d856d1674551ec9b"

 [[package]]
 name = "globset"
@@ -2664,8 +2716,10 @@ dependencies = [
 "postage",
 "rand 0.8.5",
 "resvg",
+ "schemars",
 "seahash",
 "serde",
+ "serde_derive",
 "serde_json",
 "simplelog",
 "smallvec",
@@ -3275,6 +3329,7 @@ dependencies = [
 "regex",
 "rpc",
 "serde",
+ "serde_derive",
 "serde_json",
 "settings",
 "similar",
@@ -3470,6 +3525,7 @@ dependencies = [
 "parking_lot 0.11.2",
 "postage",
 "serde",
+ "serde_derive",
 "serde_json",
 "sha2 0.10.6",
 "simplelog",
@@ -3490,6 +3546,7 @@ dependencies = [
 "prost-types 0.8.0",
 "reqwest",
 "serde",
+ "serde_derive",
 "sha2 0.10.6",
 ]

@@ -3530,6 +3587,7 @@ dependencies = [
 "parking_lot 0.11.2",
 "postage",
 "serde",
+ "serde_derive",
 "serde_json",
 "smol",
 "unindent",
@@ -3895,6 +3953,23 @@ dependencies = [
 "memoffset 0.6.5",
 ]

+[[package]]
+name = "node_runtime"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "async-compression",
+ "async-tar",
+ "futures 0.3.25",
+ "gpui",
+ "parking_lot 0.11.2",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "smol",
+ "util",
+]
+
 [[package]]
 name = "nom"
 version = "7.1.1"
@@ -4449,6 +4524,7 @@ dependencies = [
 "bincode",
 "plugin_macros",
 "serde",
+ "serde_derive",
 ]

 [[package]]
@@ -4459,6 +4535,7 @@ dependencies = [
 "proc-macro2",
 "quote",
 "serde",
+ "serde_derive",
 "syn",
 ]

@@ -4470,6 +4547,7 @@ dependencies = [
 "bincode",
 "pollster",
 "serde",
+ "serde_derive",
 "serde_json",
 "smol",
 "wasi-common",
@@ -4511,14 +4589,15 @@ checksum = "5da3b0203fd7ee5720aa0b5e790b591aa5d3f41c3ed2c34a3a393382198af2f7"

 [[package]]
 name = "postage"
-version = "0.4.1"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a63d25391d04a097954b76aba742b6b5b74f213dfe3dbaeeb36e8ddc1c657f0b"
+checksum = "af3fb618632874fb76937c2361a7f22afd393c982a2165595407edc75b06d3c1"
 dependencies = [
 "atomic",
 "crossbeam-queue",
 "futures 0.3.25",
 "log",
+ "parking_lot 0.12.1",
 "pin-project",
 "pollster",
 "static_assertions",
@@ -4607,12 +4686,15 @@ dependencies = [
 "client",
 "clock",
 "collections",
+ "ctor",
 "db",
+ "env_logger",
 "fs",
 "fsevent",
 "futures 0.3.25",
 "fuzzy",
 "git",
+ "glob",
 "gpui",
 "ignore",
 "language",
@@ -4627,6 +4709,7 @@ dependencies = [
 "regex",
 "rpc",
 "serde",
+ "serde_derive",
 "serde_json",
 "settings",
 "sha2 0.10.6",
@@ -4992,6 +5075,7 @@ dependencies = [
 "settings",
 "smol",
 "text",
+ "util",
 "workspace",
 ]

@@ -5249,6 +5333,7 @@ dependencies = [
 "rand 0.8.5",
 "rsa",
 "serde",
+ "serde_derive",
 "smol",
 "smol-timeout",
 "tempdir",
@@ -5672,6 +5757,7 @@ dependencies = [
 "postage",
 "project",
 "serde",
+ "serde_derive",
 "serde_json",
 "settings",
 "smallvec",
@@ -5858,11 +5944,14 @@ dependencies = [
 "gpui",
 "json_comments",
 "postage",
+ "pretty_assertions",
 "schemars",
 "serde",
+ "serde_derive",
 "serde_json",
 "serde_path_to_error",
 "sqlez",
+ "staff_mode",
 "theme",
 "toml",
 "tree-sitter",
@@ -6273,6 +6362,14 @@ version = "1.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a8f112729512f8e442d81f95a8a7ddf2b7c6b8a1a6f509a95864142b30cab2d3"

+[[package]]
+name = "staff_mode"
+version = "0.1.0"
+dependencies = [
+ "anyhow",
+ "gpui",
+]
+
 [[package]]
 name = "static_assertions"
 version = "1.1.0"
@@ -6480,6 +6577,7 @@ dependencies = [
 "procinfo",
 "rand 0.8.5",
 "serde",
+ "serde_derive",
 "settings",
 "shellexpand",
 "smallvec",
@@ -6511,6 +6609,7 @@ dependencies = [
 "project",
 "rand 0.8.5",
 "serde",
+ "serde_derive",
 "settings",
 "shellexpand",
 "smallvec",
@@ -6570,6 +6669,7 @@ dependencies = [
 "indexmap",
 "parking_lot 0.11.2",
 "serde",
+ "serde_derive",
 "serde_json",
 "serde_path_to_error",
 "toml",
@@ -6588,6 +6688,7 @@ dependencies = [
 "postage",
 "settings",
 "smol",
+ "staff_mode",
 "theme",
 "util",
 "workspace",
@@ -7472,11 +7573,15 @@ dependencies = [
 "dirs 3.0.2",
 "futures 0.3.25",
 "git2",
+ "isahc",
 "lazy_static",
 "log",
 "rand 0.8.5",
+ "serde",
 "serde_json",
+ "smol",
 "tempdir",
+ "url",
 ]

 [[package]]
@@ -7563,6 +7668,7 @@ dependencies = [
 "project",
 "search",
 "serde",
+ "serde_derive",
 "serde_json",
 "settings",
 "tokio",
@@ -8346,6 +8452,7 @@ dependencies = [
 "postage",
 "project",
 "serde",
+ "serde_derive",
 "serde_json",
 "settings",
 "smallvec",
@@ -8409,7 +8516,7 @@ checksum = "09041cd90cf85f7f8b2df60c646f853b7f535ce68f85244eb6731cf89fa498ec"

 [[package]]
 name = "zed"
-version = "0.78.0"
+version = "0.82.2"
 dependencies = [
 "activity_indicator",
 "anyhow",
@@ -8430,6 +8537,8 @@ dependencies = [
 "collections",
 "command_palette",
 "context_menu",
+ "copilot",
+ "copilot_button",
 "ctor",
 "db",
 "diagnostics",
@@ -8456,6 +8565,7 @@ dependencies = [
 "libc",
 "log",
 "lsp",
+ "node_runtime",
 "num_cpus",
 "outline",
 "parking_lot 0.11.2",
@@ -8472,12 +8582,14 @@ dependencies = [
 "rust-embed",
 "search",
 "serde",
+ "serde_derive",
 "serde_json",
 "serde_path_to_error",
 "settings",
 "simplelog",
 "smallvec",
 "smol",
+ "staff_mode",
 "sum_tree",
 "tempdir",
 "terminal_view",
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,6 +13,8 @@ members = [
    "crates/collections",
    "crates/command_palette",
    "crates/context_menu",
+    "crates/copilot",
+    "crates/copilot_button",
    "crates/db",
    "crates/diagnostics",
    "crates/drag_and_drop",
@@ -35,6 +37,7 @@ members = [
    "crates/lsp",
    "crates/media",
    "crates/menu",
+    "crates/node_runtime",
    "crates/outline",
    "crates/picker",
    "crates/plugin",
@@ -51,6 +54,7 @@ members = [
    "crates/snippet",
    "crates/sqlez",
    "crates/sqlez_macros",
+    "crates/staff_mode",
    "crates/sum_tree",
    "crates/terminal",
    "crates/text",
@@ -68,8 +72,10 @@ resolver = "2"

 [workspace.dependencies]
 serde = { version = "1.0", features = ["derive", "rc"] }
+serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
 serde_json = { version = "1.0", features = ["preserve_order", "raw_value"] }
 rand = { version = "0.8" }
+postage = { version = "0.5", features = ["futures-traits"] }

 [patch.crates-io]
 tree-sitter = { git = "https://github.com/tree-sitter/tree-sitter", rev = "c51896d32dcc11a38e41f36e3deb1a6a9c4f4b14" }
--- a/assets/icons/copilot_16.svg
+++ b/assets/icons/copilot_16.svg
@@ -0,0 +1,12 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
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--- a/assets/icons/link_out_12.svg
+++ b/assets/icons/link_out_12.svg
@@ -0,0 +1,5 @@
+<svg width="10" height="10" viewBox="0 0 10 10" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M5.5 1H7.5H8.75C8.88807 1 9 1.11193 9 1.25V4.5" stroke="#838994" stroke-linecap="round"/>
+<path d="M3.64645 5.64645C3.45118 5.84171 3.45118 6.15829 3.64645 6.35355C3.84171 6.54882 4.15829 6.54882 4.35355 6.35355L3.64645 5.64645ZM8.64645 0.646447L3.64645 5.64645L4.35355 6.35355L9.35355 1.35355L8.64645 0.646447Z" fill="#838994"/>
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+</svg>
--- a/assets/icons/zed_plus_copilot_32.svg
+++ b/assets/icons/zed_plus_copilot_32.svg
@@ -0,0 +1,14 @@
+<svg width="93" height="32" viewBox="0 0 93 32" fill="none" xmlns="http://www.w3.org/2000/svg">
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+</svg>
--- a/assets/keymaps/atom.json
+++ b/assets/keymaps/atom.json
@@ -55,7 +55,7 @@
    "bindings": {
      "ctrl-[": "project_panel::CollapseSelectedEntry",
      "ctrl-b": "project_panel::CollapseSelectedEntry",
-      "h": "project_panel::CollapseSelectedEntry",
+      "alt-b": "project_panel::CollapseSelectedEntry",
      "ctrl-]": "project_panel::ExpandSelectedEntry",
      "ctrl-f": "project_panel::ExpandSelectedEntry",
      "ctrl-shift-c": "project_panel::CopyPath"
--- a/assets/keymaps/default.json
+++ b/assets/keymaps/default.json
@@ -176,7 +176,10 @@
                {
                    "focus": false
                }
-            ]
+            ],
+            "alt-\\": "copilot::NextSuggestion",
+            "alt-]": "copilot::NextSuggestion",
+            "alt-[": "copilot::PreviousSuggestion"
        }
    },
    {
@@ -474,6 +477,7 @@
            "cmd-c": "project_panel::Copy",
            "cmd-v": "project_panel::Paste",
            "cmd-alt-c": "project_panel::CopyPath",
+            "alt-cmd-shift-c": "project_panel::CopyRelativePath",
            "f2": "project_panel::Rename",
            "backspace": "project_panel::Delete",
            "alt-cmd-r": "project_panel::RevealInFinder"
--- a/assets/settings/default.json
+++ b/assets/settings/default.json
@@ -3,11 +3,21 @@
    "theme": "One Dark",
    // The name of a font to use for rendering text in the editor
    "buffer_font_family": "Zed Mono",
+    // The OpenType features to enable for text in the editor.
+    "buffer_font_features": {
+        // Disable ligatures:
+        // "calt": false
+    },
    // The default font size for text in the editor
    "buffer_font_size": 15,
    // The factor to grow the active pane by. Defaults to 1.0
    // which gives the same size as all other panes.
    "active_pane_magnification": 1.0,
+    // Enable / disable copilot integration.
+    "enable_copilot_integration": true,
+    // Controls whether copilot provides suggestion immediately
+    // or waits for a `copilot::Toggle`
+    "copilot": "on",
    // Whether to enable vim modes and key bindings
    "vim_mode": false,
    // Whether to show the informational hover box when moving the mouse
@@ -20,7 +30,7 @@
    // Whether to pop the completions menu while typing in an editor without
    // explicitly requesting it.
    "show_completions_on_input": true,
-    // Whether the screen sharing icon is showed in the os status bar.
+    // Whether the screen sharing icon is shown in the os status bar.
    "show_call_status_icon": true,
    // Whether to use language servers to provide code intelligence.
    "enable_language_server": true,
@@ -115,7 +125,7 @@
    // Settings specific to the terminal
    "terminal": {
        // What shell to use when opening a terminal. May take 3 values:
-        // 1. Use the system's default terminal configuration (e.g. $TERM).
+        // 1. Use the system's default terminal configuration in /etc/passwd
        //      "shell": "system"
        // 2. A program:
        //      "shell": {
--- a/crates/activity_indicator/src/activity_indicator.rs
+++ b/crates/activity_indicator/src/activity_indicator.rs
@@ -2,8 +2,10 @@ use auto_update::{AutoUpdateStatus, AutoUpdater, DismissErrorMessage};
 use editor::Editor;
 use futures::StreamExt;
 use gpui::{
-    actions, elements::*, platform::CursorStyle, Action, AppContext, Entity, ModelHandle,
-    MouseButton, MutableAppContext, RenderContext, View, ViewContext, ViewHandle,
+    actions,
+    elements::*,
+    platform::{CursorStyle, MouseButton},
+    Action, AppContext, Entity, ModelHandle, RenderContext, View, ViewContext, ViewHandle,
 };
 use language::{LanguageRegistry, LanguageServerBinaryStatus};
 use project::{LanguageServerProgress, Project};
@@ -46,7 +48,7 @@ struct Content {
    action: Option<Box<dyn Action>>,
 }

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(ActivityIndicator::show_error_message);
    cx.add_action(ActivityIndicator::dismiss_error_message);
 }
--- a/crates/auto_update/Cargo.toml
+++ b/crates/auto_update/Cargo.toml
@@ -22,7 +22,8 @@ anyhow = "1.0.38"
 isahc = "1.7"
 lazy_static = "1.4"
 log = "0.4"
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_json = { version = "1.0", features = ["preserve_order"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
+serde_json = { workspace = true }
 smol = "1.2.5"
 tempdir = "0.3.7"
--- a/crates/auto_update/src/auto_update.rs
+++ b/crates/auto_update/src/auto_update.rs
@@ -1,12 +1,11 @@
 mod update_notification;

 use anyhow::{anyhow, Context, Result};
-use client::{http::HttpClient, ZED_SECRET_CLIENT_TOKEN};
-use client::{ZED_APP_PATH, ZED_APP_VERSION};
+use client::{ZED_APP_PATH, ZED_APP_VERSION, ZED_SECRET_CLIENT_TOKEN};
 use db::kvp::KEY_VALUE_STORE;
 use gpui::{
    actions, platform::AppVersion, AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle,
-    MutableAppContext, Task, WeakViewHandle,
+    Task, WeakViewHandle,
 };
 use serde::Deserialize;
 use settings::Settings;
@@ -14,6 +13,7 @@ use smol::{fs::File, io::AsyncReadExt, process::Command};
 use std::{ffi::OsString, sync::Arc, time::Duration};
 use update_notification::UpdateNotification;
 use util::channel::ReleaseChannel;
+use util::http::HttpClient;
 use workspace::Workspace;

 const SHOULD_SHOW_UPDATE_NOTIFICATION_KEY: &str = "auto-updater-should-show-updated-notification";
@@ -49,7 +49,7 @@ impl Entity for AutoUpdater {
    type Event = ();
 }

-pub fn init(http_client: Arc<dyn HttpClient>, server_url: String, cx: &mut MutableAppContext) {
+pub fn init(http_client: Arc<dyn HttpClient>, server_url: String, cx: &mut AppContext) {
    if let Some(version) = (*ZED_APP_VERSION).or_else(|| cx.platform().app_version().ok()) {
        let server_url = server_url;
        let auto_updater = cx.add_model(|cx| {
@@ -63,10 +63,10 @@ pub fn init(http_client: Arc<dyn HttpClient>, server_url: String, cx: &mut Mutab
            cx.observe_global::<Settings, _>(move |updater, cx| {
                if cx.global::<Settings>().auto_update {
                    if update_subscription.is_none() {
-                        *(&mut update_subscription) = Some(updater.start_polling(cx))
+                        update_subscription = Some(updater.start_polling(cx))
                    }
                } else {
-                    (&mut update_subscription).take();
+                    update_subscription.take();
                }
            })
            .detach();
@@ -95,7 +95,7 @@ pub fn init(http_client: Arc<dyn HttpClient>, server_url: String, cx: &mut Mutab

 pub fn notify_of_any_new_update(
    workspace: WeakViewHandle<Workspace>,
-    cx: &mut MutableAppContext,
+    cx: &mut AppContext,
 ) -> Option<()> {
    let updater = AutoUpdater::get(cx)?;
    let version = updater.read(cx).current_version;
@@ -124,7 +124,7 @@ pub fn notify_of_any_new_update(
 }

 impl AutoUpdater {
-    pub fn get(cx: &mut MutableAppContext) -> Option<ModelHandle<Self>> {
+    pub fn get(cx: &mut AppContext) -> Option<ModelHandle<Self>> {
        cx.default_global::<Option<ModelHandle<Self>>>().clone()
    }

--- a/crates/auto_update/src/update_notification.rs
+++ b/crates/auto_update/src/update_notification.rs
@@ -1,8 +1,8 @@
 use crate::ViewReleaseNotes;
 use gpui::{
    elements::{Flex, MouseEventHandler, Padding, ParentElement, Svg, Text},
-    platform::{AppVersion, CursorStyle},
-    Element, Entity, MouseButton, View, ViewContext,
+    platform::{AppVersion, CursorStyle, MouseButton},
+    Element, Entity, View, ViewContext,
 };
 use menu::Cancel;
 use settings::Settings;
--- a/crates/breadcrumbs/Cargo.toml
+++ b/crates/breadcrumbs/Cargo.toml
@@ -18,6 +18,7 @@ search = { path = "../search" }
 settings = { path = "../settings" }
 theme = { path = "../theme" }
 workspace = { path = "../workspace" }
+outline = { path = "../outline" }
 itertools = "0.10"

 [dev-dependencies]
--- a/crates/breadcrumbs/src/breadcrumbs.rs
+++ b/crates/breadcrumbs/src/breadcrumbs.rs
@@ -1,5 +1,6 @@
 use gpui::{
-    elements::*, AppContext, Entity, RenderContext, Subscription, View, ViewContext, ViewHandle,
+    elements::*, platform::MouseButton, AppContext, Entity, RenderContext, Subscription, View,
+    ViewContext, ViewHandle,
 };
 use itertools::Itertools;
 use search::ProjectSearchView;
@@ -14,6 +15,7 @@ pub enum Event {
 }

 pub struct Breadcrumbs {
+    pane_focused: bool,
    active_item: Option<Box<dyn ItemHandle>>,
    project_search: Option<ViewHandle<ProjectSearchView>>,
    subscription: Option<Subscription>,
@@ -22,6 +24,7 @@ pub struct Breadcrumbs {
 impl Breadcrumbs {
    pub fn new() -> Self {
        Self {
+            pane_focused: false,
            active_item: Default::default(),
            subscription: Default::default(),
            project_search: Default::default(),
@@ -39,24 +42,53 @@ impl View for Breadcrumbs {
    }

    fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
+        let active_item = match &self.active_item {
+            Some(active_item) => active_item,
+            None => return Empty::new().boxed(),
+        };
+        let not_editor = active_item.downcast::<editor::Editor>().is_none();
+
        let theme = cx.global::<Settings>().theme.clone();
-        if let Some(breadcrumbs) = self
-            .active_item
-            .as_ref()
-            .and_then(|item| item.breadcrumbs(&theme, cx))
-        {
-            Flex::row()
-                .with_children(Itertools::intersperse_with(breadcrumbs.into_iter(), || {
-                    Label::new(" 〉 ", theme.breadcrumbs.text.clone()).boxed()
-                }))
-                .contained()
-                .with_style(theme.breadcrumbs.container)
+        let style = &theme.workspace.breadcrumbs;
+
+        let breadcrumbs = match active_item.breadcrumbs(&theme, cx) {
+            Some(breadcrumbs) => breadcrumbs,
+            None => return Empty::new().boxed(),
+        };
+
+        let crumbs = Flex::row()
+            .with_children(Itertools::intersperse_with(breadcrumbs.into_iter(), || {
+                Label::new(" 〉 ", style.default.text.clone()).boxed()
+            }))
+            .constrained()
+            .with_height(theme.workspace.breadcrumb_height)
+            .contained();
+
+        if not_editor || !self.pane_focused {
+            return crumbs
+                .with_style(style.default.container)
                .aligned()
                .left()
-                .boxed()
-        } else {
-            Empty::new().boxed()
+                .boxed();
        }
+
+        MouseEventHandler::<Breadcrumbs>::new(0, cx, |state, _| {
+            let style = style.style_for(state, false);
+            crumbs.with_style(style.container).boxed()
+        })
+        .on_click(MouseButton::Left, |_, cx| {
+            cx.dispatch_action(outline::Toggle);
+        })
+        .with_tooltip::<Breadcrumbs, _>(
+            0,
+            "Show symbol outline".to_owned(),
+            Some(Box::new(outline::Toggle)),
+            theme.tooltip.clone(),
+            cx,
+        )
+        .aligned()
+        .left()
+        .boxed()
    }
 }

@@ -103,4 +135,8 @@ impl ToolbarItemView for Breadcrumbs {
            current_location
        }
    }
+
+    fn pane_focus_update(&mut self, pane_focused: bool, _: &mut gpui::AppContext) {
+        self.pane_focused = pane_focused;
+    }
 }
--- a/crates/call/Cargo.toml
+++ b/crates/call/Cargo.toml
@@ -34,7 +34,7 @@ util = { path = "../util" }
 anyhow = "1.0.38"
 async-broadcast = "0.4"
 futures = "0.3"
-postage = { version = "0.4.1", features = ["futures-traits"] }
+postage = { workspace = true }

 [dev-dependencies]
 client = { path = "../client", features = ["test-support"] }
--- a/crates/call/src/call.rs
+++ b/crates/call/src/call.rs
@@ -10,15 +10,15 @@ use futures::{future::Shared, FutureExt};
 use postage::watch;

 use gpui::{
-    AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle, MutableAppContext,
-    Subscription, Task, WeakModelHandle,
+    AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle, Subscription, Task,
+    WeakModelHandle,
 };
 use project::Project;

 pub use participant::ParticipantLocation;
 pub use room::Room;

-pub fn init(client: Arc<Client>, user_store: ModelHandle<UserStore>, cx: &mut MutableAppContext) {
+pub fn init(client: Arc<Client>, user_store: ModelHandle<UserStore>, cx: &mut AppContext) {
    let active_call = cx.add_model(|cx| ActiveCall::new(client, user_store, cx));
    cx.set_global(active_call);
 }
--- a/crates/call/src/room.rs
+++ b/crates/call/src/room.rs
@@ -10,9 +10,7 @@ use client::{
 use collections::{BTreeMap, HashMap, HashSet};
 use fs::Fs;
 use futures::{FutureExt, StreamExt};
-use gpui::{
-    AsyncAppContext, Entity, ModelContext, ModelHandle, MutableAppContext, Task, WeakModelHandle,
-};
+use gpui::{AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle, Task, WeakModelHandle};
 use language::LanguageRegistry;
 use live_kit_client::{LocalTrackPublication, LocalVideoTrack, RemoteVideoTrackUpdate};
 use postage::stream::Stream;
@@ -64,16 +62,13 @@ pub struct Room {
 impl Entity for Room {
    type Event = Event;

-    fn release(&mut self, cx: &mut MutableAppContext) {
+    fn release(&mut self, cx: &mut AppContext) {
        if self.status.is_online() {
            self.leave_internal(cx).detach_and_log_err(cx);
        }
    }

-    fn app_will_quit(
-        &mut self,
-        cx: &mut MutableAppContext,
-    ) -> Option<Pin<Box<dyn Future<Output = ()>>>> {
+    fn app_will_quit(&mut self, cx: &mut AppContext) -> Option<Pin<Box<dyn Future<Output = ()>>>> {
        if self.status.is_online() {
            let leave = self.leave_internal(cx);
            Some(
@@ -176,7 +171,7 @@ impl Room {
        initial_project: Option<ModelHandle<Project>>,
        client: Arc<Client>,
        user_store: ModelHandle<UserStore>,
-        cx: &mut MutableAppContext,
+        cx: &mut AppContext,
    ) -> Task<Result<ModelHandle<Self>>> {
        cx.spawn(|mut cx| async move {
            let response = client.request(proto::CreateRoom {}).await?;
@@ -219,7 +214,7 @@ impl Room {
        call: &IncomingCall,
        client: Arc<Client>,
        user_store: ModelHandle<UserStore>,
-        cx: &mut MutableAppContext,
+        cx: &mut AppContext,
    ) -> Task<Result<ModelHandle<Self>>> {
        let room_id = call.room_id;
        cx.spawn(|mut cx| async move {
@@ -257,7 +252,7 @@ impl Room {
        self.leave_internal(cx)
    }

-    fn leave_internal(&mut self, cx: &mut MutableAppContext) -> Task<Result<()>> {
+    fn leave_internal(&mut self, cx: &mut AppContext) -> Task<Result<()>> {
        if self.status.is_offline() {
            return Task::ready(Err(anyhow!("room is offline")));
        }
@@ -275,6 +270,7 @@ impl Room {
            if let Some(project) = project.upgrade(cx) {
                project.update(cx, |project, cx| {
                    project.disconnected_from_host(cx);
+                    project.close(cx);
                });
            }
        }
@@ -423,7 +419,7 @@ impl Room {
            false
        });

-        let response = self.client.request(proto::RejoinRoom {
+        let response = self.client.request_envelope(proto::RejoinRoom {
            id: self.id,
            reshared_projects,
            rejoined_projects,
@@ -431,6 +427,8 @@ impl Room {

        cx.spawn(|this, mut cx| async move {
            let response = response.await?;
+            let message_id = response.message_id;
+            let response = response.payload;
            let room_proto = response.room.ok_or_else(|| anyhow!("invalid room"))?;
            this.update(&mut cx, |this, cx| {
                this.status = RoomStatus::Online;
@@ -447,7 +445,7 @@ impl Room {
                for rejoined_project in response.rejoined_projects {
                    if let Some(project) = projects.get(&rejoined_project.id) {
                        project.update(cx, |project, cx| {
-                            project.rejoined(rejoined_project, cx).log_err();
+                            project.rejoined(rejoined_project, message_id, cx).log_err();
                        });
                    }
                }
--- a/crates/cli/Cargo.toml
+++ b/crates/cli/Cargo.toml
@@ -17,7 +17,8 @@ anyhow = "1.0"
 clap = { version = "3.1", features = ["derive"] }
 dirs = "3.0"
 ipc-channel = "0.16"
-serde = { version = "1.0", features = ["derive", "rc"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }

 [target.'cfg(target_os = "macos")'.dependencies]
 core-foundation = "0.9"
--- a/crates/client/Cargo.toml
+++ b/crates/client/Cargo.toml
@@ -17,17 +17,17 @@ db = { path = "../db" }
 gpui = { path = "../gpui" }
 util = { path = "../util" }
 rpc = { path = "../rpc" }
+staff_mode = { path = "../staff_mode" }
 sum_tree = { path = "../sum_tree" }
 anyhow = "1.0.38"
 async-recursion = "0.3"
 async-tungstenite = { version = "0.16", features = ["async-tls"] }
 futures = "0.3"
 image = "0.23"
-isahc = "1.7"
 lazy_static = "1.4.0"
 log = { version = "0.4.16", features = ["kv_unstable_serde"] }
 parking_lot = "0.11.1"
-postage = { version = "0.4.1", features = ["futures-traits"] }
+postage = { workspace = true }
 rand = "0.8.3"
 smol = "1.2.5"
 thiserror = "1.0.29"
@@ -35,7 +35,8 @@ time = { version = "0.3", features = ["serde", "serde-well-known"] }
 tiny_http = "0.8"
 uuid = { version = "1.1.2", features = ["v4"] }
 url = "2.2"
-serde = { version = "*", features = ["derive"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 settings = { path = "../settings" }
 tempfile = "3"

@@ -44,3 +45,4 @@ collections = { path = "../collections", features = ["test-support"] }
 gpui = { path = "../gpui", features = ["test-support"] }
 rpc = { path = "../rpc", features = ["test-support"] }
 settings = { path = "../settings", features = ["test-support"] }
+util = { path = "../util", features = ["test-support"] }
--- a/crates/client/src/client.rs
+++ b/crates/client/src/client.rs
@@ -1,7 +1,6 @@
 #[cfg(any(test, feature = "test-support"))]
 pub mod test;

-pub mod http;
 pub mod telemetry;
 pub mod user;

@@ -11,14 +10,17 @@ use async_tungstenite::tungstenite::{
    error::Error as WebsocketError,
    http::{Request, StatusCode},
 };
-use futures::{future::LocalBoxFuture, AsyncReadExt, FutureExt, SinkExt, StreamExt, TryStreamExt};
+use futures::{
+    future::LocalBoxFuture, AsyncReadExt, FutureExt, SinkExt, StreamExt, TryFutureExt as _,
+    TryStreamExt,
+};
 use gpui::{
    actions,
+    platform::AppVersion,
    serde_json::{self, Value},
-    AnyModelHandle, AnyViewHandle, AnyWeakModelHandle, AnyWeakViewHandle, AppContext, AppVersion,
-    AsyncAppContext, Entity, ModelHandle, MutableAppContext, Task, View, ViewContext, ViewHandle,
+    AnyModelHandle, AnyViewHandle, AnyWeakModelHandle, AnyWeakViewHandle, AppContext,
+    AsyncAppContext, Entity, ModelHandle, Task, View, ViewContext, ViewHandle,
 };
-use http::HttpClient;
 use lazy_static::lazy_static;
 use parking_lot::RwLock;
 use postage::watch;
@@ -41,6 +43,7 @@ use telemetry::Telemetry;
 use thiserror::Error;
 use url::Url;
 use util::channel::ReleaseChannel;
+use util::http::HttpClient;
 use util::{ResultExt, TryFutureExt};

 pub use rpc::*;
@@ -68,7 +71,7 @@ pub const CONNECTION_TIMEOUT: Duration = Duration::from_secs(5);

 actions!(client, [SignIn, SignOut]);

-pub fn init(client: Arc<Client>, cx: &mut MutableAppContext) {
+pub fn init(client: Arc<Client>, cx: &mut AppContext) {
    cx.add_global_action({
        let client = client.clone();
        move |_: &SignIn, cx| {
@@ -130,7 +133,7 @@ pub enum EstablishConnectionError {
    #[error("{0}")]
    Other(#[from] anyhow::Error),
    #[error("{0}")]
-    Http(#[from] http::Error),
+    Http(#[from] util::http::Error),
    #[error("{0}")]
    Io(#[from] std::io::Error),
    #[error("{0}")]
@@ -294,7 +297,7 @@ impl<T: Entity> PendingEntitySubscription<T> {

        state
            .entities_by_type_and_remote_id
-            .insert(id, WeakSubscriber::Model(model.downgrade().into()));
+            .insert(id, WeakSubscriber::Model(model.downgrade().into_any()));
        drop(state);
        for message in messages {
            self.client.handle_message(message, cx);
@@ -461,7 +464,7 @@ impl Client {
        self.state
            .write()
            .entities_by_type_and_remote_id
-            .insert(id, WeakSubscriber::View(cx.weak_handle().into()));
+            .insert(id, WeakSubscriber::View(cx.weak_handle().into_any()));
        Subscription::Entity {
            client: Arc::downgrade(self),
            id,
@@ -471,18 +474,22 @@ impl Client {
    pub fn subscribe_to_entity<T: Entity>(
        self: &Arc<Self>,
        remote_id: u64,
-    ) -> PendingEntitySubscription<T> {
+    ) -> Result<PendingEntitySubscription<T>> {
        let id = (TypeId::of::<T>(), remote_id);
-        self.state
-            .write()
-            .entities_by_type_and_remote_id
-            .insert(id, WeakSubscriber::Pending(Default::default()));

-        PendingEntitySubscription {
-            client: self.clone(),
-            remote_id,
-            consumed: false,
-            _entity_type: PhantomData,
+        let mut state = self.state.write();
+        if state.entities_by_type_and_remote_id.contains_key(&id) {
+            return Err(anyhow!("already subscribed to entity"));
+        } else {
+            state
+                .entities_by_type_and_remote_id
+                .insert(id, WeakSubscriber::Pending(Default::default()));
+            Ok(PendingEntitySubscription {
+                client: self.clone(),
+                remote_id,
+                consumed: false,
+                _entity_type: PhantomData,
+            })
        }
    }

@@ -505,7 +512,7 @@ impl Client {
        let mut state = self.state.write();
        state
            .models_by_message_type
-            .insert(message_type_id, model.downgrade().into());
+            .insert(message_type_id, model.downgrade().into_any());

        let prev_handler = state.message_handlers.insert(
            message_type_id,
@@ -1188,6 +1195,14 @@ impl Client {
        &self,
        request: T,
    ) -> impl Future<Output = Result<T::Response>> {
+        self.request_envelope(request)
+            .map_ok(|envelope| envelope.payload)
+    }
+
+    pub fn request_envelope<T: RequestMessage>(
+        &self,
+        request: T,
+    ) -> impl Future<Output = Result<TypedEnvelope<T::Response>>> {
        let client_id = self.id;
        log::debug!(
            "rpc request start. client_id:{}. name:{}",
@@ -1196,7 +1211,7 @@ impl Client {
        );
        let response = self
            .connection_id()
-            .map(|conn_id| self.peer.request(conn_id, request));
+            .map(|conn_id| self.peer.request_envelope(conn_id, request));
        async move {
            let response = response?.await;
            log::debug!(
@@ -1396,10 +1411,11 @@ pub fn decode_worktree_url(url: &str) -> Option<(u64, String)> {
 #[cfg(test)]
 mod tests {
    use super::*;
-    use crate::test::{FakeHttpClient, FakeServer};
+    use crate::test::FakeServer;
    use gpui::{executor::Deterministic, TestAppContext};
    use parking_lot::Mutex;
    use std::future;
+    use util::http::FakeHttpClient;

    #[gpui::test(iterations = 10)]
    async fn test_reconnection(cx: &mut TestAppContext) {
@@ -1594,14 +1610,17 @@ mod tests {

        let _subscription1 = client
            .subscribe_to_entity(1)
+            .unwrap()
            .set_model(&model1, &mut cx.to_async());
        let _subscription2 = client
            .subscribe_to_entity(2)
+            .unwrap()
            .set_model(&model2, &mut cx.to_async());
        // Ensure dropping a subscription for the same entity type still allows receiving of
        // messages for other entity IDs of the same type.
        let subscription3 = client
            .subscribe_to_entity(3)
+            .unwrap()
            .set_model(&model3, &mut cx.to_async());
        drop(subscription3);

@@ -1630,11 +1649,13 @@ mod tests {
            },
        );
        drop(subscription1);
-        let _subscription2 =
-            client.add_message_handler(model, move |_, _: TypedEnvelope<proto::Ping>, _, _| {
+        let _subscription2 = client.add_message_handler(
+            model.clone(),
+            move |_, _: TypedEnvelope<proto::Ping>, _, _| {
                done_tx2.try_send(()).unwrap();
                async { Ok(()) }
-            });
+            },
+        );
        server.send(proto::Ping {});
        done_rx2.next().await.unwrap();
    }
--- a/crates/client/src/http.rs
+++ b/crates/client/src/http.rs
@@ -1,57 +0,0 @@
-pub use anyhow::{anyhow, Result};
-use futures::future::BoxFuture;
-use isahc::{
-    config::{Configurable, RedirectPolicy},
-    AsyncBody,
-};
-pub use isahc::{
-    http::{Method, Uri},
-    Error,
-};
-use smol::future::FutureExt;
-use std::{sync::Arc, time::Duration};
-pub use url::Url;
-
-pub type Request = isahc::Request<AsyncBody>;
-pub type Response = isahc::Response<AsyncBody>;
-
-pub trait HttpClient: Send + Sync {
-    fn send(&self, req: Request) -> BoxFuture<Result<Response, Error>>;
-
-    fn get<'a>(
-        &'a self,
-        uri: &str,
-        body: AsyncBody,
-        follow_redirects: bool,
-    ) -> BoxFuture<'a, Result<Response, Error>> {
-        let request = isahc::Request::builder()
-            .redirect_policy(if follow_redirects {
-                RedirectPolicy::Follow
-            } else {
-                RedirectPolicy::None
-            })
-            .method(Method::GET)
-            .uri(uri)
-            .body(body);
-        match request {
-            Ok(request) => self.send(request),
-            Err(error) => async move { Err(error.into()) }.boxed(),
-        }
-    }
-}
-
-pub fn client() -> Arc<dyn HttpClient> {
-    Arc::new(
-        isahc::HttpClient::builder()
-            .connect_timeout(Duration::from_secs(5))
-            .low_speed_timeout(100, Duration::from_secs(5))
-            .build()
-            .unwrap(),
-    )
-}
-
-impl HttpClient for isahc::HttpClient {
-    fn send(&self, req: Request) -> BoxFuture<Result<Response, Error>> {
-        Box::pin(async move { self.send_async(req).await })
-    }
-}
--- a/crates/client/src/telemetry.rs
+++ b/crates/client/src/telemetry.rs
@@ -1,11 +1,9 @@
-use crate::http::HttpClient;
 use db::kvp::KEY_VALUE_STORE;
 use gpui::{
    executor::Background,
    serde_json::{self, value::Map, Value},
    AppContext, Task,
 };
-use isahc::Request;
 use lazy_static::lazy_static;
 use parking_lot::Mutex;
 use serde::Serialize;
@@ -19,6 +17,7 @@ use std::{
    time::{Duration, SystemTime, UNIX_EPOCH},
 };
 use tempfile::NamedTempFile;
+use util::http::HttpClient;
 use util::{channel::ReleaseChannel, post_inc, ResultExt, TryFutureExt};
 use uuid::Uuid;

@@ -220,10 +219,10 @@ impl Telemetry {
                                "App": true
                            }),
                        }])?;
-                        let request = Request::post(MIXPANEL_ENGAGE_URL)
-                            .header("Content-Type", "application/json")
-                            .body(json_bytes.into())?;
-                        this.http_client.send(request).await?;
+
+                        this.http_client
+                            .post_json(MIXPANEL_ENGAGE_URL, json_bytes.into())
+                            .await?;
                        anyhow::Ok(())
                    }
                    .log_err(),
@@ -316,10 +315,9 @@ impl Telemetry {

                        json_bytes.clear();
                        serde_json::to_writer(&mut json_bytes, &events)?;
-                        let request = Request::post(MIXPANEL_EVENTS_URL)
-                            .header("Content-Type", "application/json")
-                            .body(json_bytes.into())?;
-                        this.http_client.send(request).await?;
+                        this.http_client
+                            .post_json(MIXPANEL_EVENTS_URL, json_bytes.into())
+                            .await?;
                        anyhow::Ok(())
                    }
                    .log_err(),
--- a/crates/client/src/test.rs
+++ b/crates/client/src/test.rs
@@ -1,16 +1,14 @@
-use crate::{
-    http::{self, HttpClient, Request, Response},
-    Client, Connection, Credentials, EstablishConnectionError, UserStore,
-};
+use crate::{Client, Connection, Credentials, EstablishConnectionError, UserStore};
 use anyhow::{anyhow, Result};
-use futures::{future::BoxFuture, stream::BoxStream, Future, StreamExt};
+use futures::{stream::BoxStream, StreamExt};
 use gpui::{executor, ModelHandle, TestAppContext};
 use parking_lot::Mutex;
 use rpc::{
    proto::{self, GetPrivateUserInfo, GetPrivateUserInfoResponse},
    ConnectionId, Peer, Receipt, TypedEnvelope,
 };
-use std::{fmt, rc::Rc, sync::Arc};
+use std::{rc::Rc, sync::Arc};
+use util::http::FakeHttpClient;

 pub struct FakeServer {
    peer: Arc<Peer>,
@@ -219,46 +217,3 @@ impl Drop for FakeServer {
        self.disconnect();
    }
 }
-
-pub struct FakeHttpClient {
-    handler: Box<
-        dyn 'static
-            + Send
-            + Sync
-            + Fn(Request) -> BoxFuture<'static, Result<Response, http::Error>>,
-    >,
-}
-
-impl FakeHttpClient {
-    pub fn create<Fut, F>(handler: F) -> Arc<dyn HttpClient>
-    where
-        Fut: 'static + Send + Future<Output = Result<Response, http::Error>>,
-        F: 'static + Send + Sync + Fn(Request) -> Fut,
-    {
-        Arc::new(Self {
-            handler: Box::new(move |req| Box::pin(handler(req))),
-        })
-    }
-
-    pub fn with_404_response() -> Arc<dyn HttpClient> {
-        Self::create(|_| async move {
-            Ok(isahc::Response::builder()
-                .status(404)
-                .body(Default::default())
-                .unwrap())
-        })
-    }
-}
-
-impl fmt::Debug for FakeHttpClient {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("FakeHttpClient").finish()
-    }
-}
-
-impl HttpClient for FakeHttpClient {
-    fn send(&self, req: Request) -> BoxFuture<Result<Response, crate::http::Error>> {
-        let future = (self.handler)(req);
-        Box::pin(async move { future.await.map(Into::into) })
-    }
-}
--- a/crates/client/src/user.rs
+++ b/crates/client/src/user.rs
@@ -1,4 +1,4 @@
-use super::{http::HttpClient, proto, Client, Status, TypedEnvelope};
+use super::{proto, Client, Status, TypedEnvelope};
 use anyhow::{anyhow, Context, Result};
 use collections::{hash_map::Entry, HashMap, HashSet};
 use futures::{channel::mpsc, future, AsyncReadExt, Future, StreamExt};
@@ -6,8 +6,10 @@ use gpui::{AsyncAppContext, Entity, ImageData, ModelContext, ModelHandle, Task};
 use postage::{sink::Sink, watch};
 use rpc::proto::{RequestMessage, UsersResponse};
 use settings::Settings;
+use staff_mode::StaffMode;
 use std::sync::{Arc, Weak};
-use util::{StaffMode, TryFutureExt as _};
+use util::http::HttpClient;
+use util::TryFutureExt as _;

 #[derive(Default, Debug)]
 pub struct User {
--- a/crates/collab/Cargo.toml
+++ b/crates/collab/Cargo.toml
@@ -3,7 +3,7 @@ authors = ["Nathan Sobo <nathan@zed.dev>"]
 default-run = "collab"
 edition = "2021"
 name = "collab"
-version = "0.8.0"
+version = "0.8.2"
 publish = false

 [[bin]]
@@ -31,6 +31,7 @@ futures = "0.3"
 hyper = "0.14"
 lazy_static = "1.4"
 lipsum = { version = "0.8", optional = true }
+log = { version = "0.4.16", features = ["kv_unstable_serde"] }
 nanoid = "0.4"
 parking_lot = "0.11.1"
 prometheus = "0.13"
@@ -40,8 +41,9 @@ scrypt = "0.7"
 # Remove fork dependency when a version with https://github.com/SeaQL/sea-orm/pull/1283 is released.
 sea-orm = { git = "https://github.com/zed-industries/sea-orm", rev = "18f4c691085712ad014a51792af75a9044bacee6", features = ["sqlx-postgres", "postgres-array", "runtime-tokio-rustls"] }
 sea-query = "0.27"
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_json = "1.0"
+serde = { workspace = true }
+serde_derive = { workspace = true }
+serde_json = { workspace = true }
 sha-1 = "0.9"
 sqlx = { version = "0.6", features = ["runtime-tokio-rustls", "postgres", "json", "time", "uuid", "any"] }
 time = { version = "0.3", features = ["serde", "serde-well-known"] }
@@ -74,11 +76,10 @@ workspace = { path = "../workspace", features = ["test-support"] }

 ctor = "0.1"
 env_logger = "0.9"
-log = { version = "0.4.16", features = ["kv_unstable_serde"] }
 util = { path = "../util" }
 lazy_static = "1.4"
 sea-orm = { git = "https://github.com/zed-industries/sea-orm", rev = "18f4c691085712ad014a51792af75a9044bacee6", features = ["sqlx-sqlite"] }
-serde_json = { version = "1.0", features = ["preserve_order"] }
+serde_json = { workspace = true }
 sqlx = { version = "0.6", features = ["sqlite"] }
 unindent = "0.1"

--- a/crates/collab/src/auth.rs
+++ b/crates/collab/src/auth.rs
@@ -1,5 +1,5 @@
 use crate::{
-    db::{self, UserId},
+    db::{self, AccessTokenId, Database, UserId},
    AppState, Error, Result,
 };
 use anyhow::{anyhow, Context};
@@ -8,12 +8,24 @@ use axum::{
    middleware::Next,
    response::IntoResponse,
 };
+use lazy_static::lazy_static;
+use prometheus::{exponential_buckets, register_histogram, Histogram};
 use rand::thread_rng;
 use scrypt::{
    password_hash::{PasswordHash, PasswordHasher, PasswordVerifier, SaltString},
    Scrypt,
 };
-use std::sync::Arc;
+use serde::{Deserialize, Serialize};
+use std::{sync::Arc, time::Instant};
+
+lazy_static! {
+    static ref METRIC_ACCESS_TOKEN_HASHING_TIME: Histogram = register_histogram!(
+        "access_token_hashing_time",
+        "time spent hashing access tokens",
+        exponential_buckets(10.0, 2.0, 10).unwrap(),
+    )
+    .unwrap();
+}

 pub async fn validate_header<B>(mut req: Request<B>, next: Next<B>) -> impl IntoResponse {
    let mut auth_header = req
@@ -42,20 +54,14 @@ pub async fn validate_header<B>(mut req: Request<B>, next: Next<B>) -> impl Into
        )
    })?;

-    let mut credentials_valid = false;
    let state = req.extensions().get::<Arc<AppState>>().unwrap();
-    if let Some(admin_token) = access_token.strip_prefix("ADMIN_TOKEN:") {
-        if state.config.api_token == admin_token {
-            credentials_valid = true;
-        }
+    let credentials_valid = if let Some(admin_token) = access_token.strip_prefix("ADMIN_TOKEN:") {
+        state.config.api_token == admin_token
    } else {
-        for password_hash in state.db.get_access_token_hashes(user_id).await? {
-            if verify_access_token(access_token, &password_hash)? {
-                credentials_valid = true;
-                break;
-            }
-        }
-    }
+        verify_access_token(&access_token, user_id, &state.db)
+            .await
+            .unwrap_or(false)
+    };

    if credentials_valid {
        let user = state
@@ -75,13 +81,26 @@ pub async fn validate_header<B>(mut req: Request<B>, next: Next<B>) -> impl Into

 const MAX_ACCESS_TOKENS_TO_STORE: usize = 8;

+#[derive(Serialize, Deserialize)]
+struct AccessTokenJson {
+    version: usize,
+    id: AccessTokenId,
+    token: String,
+}
+
 pub async fn create_access_token(db: &db::Database, user_id: UserId) -> Result<String> {
+    const VERSION: usize = 1;
    let access_token = rpc::auth::random_token();
    let access_token_hash =
        hash_access_token(&access_token).context("failed to hash access token")?;
-    db.create_access_token_hash(user_id, &access_token_hash, MAX_ACCESS_TOKENS_TO_STORE)
+    let id = db
+        .create_access_token(user_id, &access_token_hash, MAX_ACCESS_TOKENS_TO_STORE)
        .await?;
-    Ok(access_token)
+    Ok(serde_json::to_string(&AccessTokenJson {
+        version: VERSION,
+        id,
+        token: access_token,
+    })?)
 }

 fn hash_access_token(token: &str) -> Result<String> {
@@ -89,7 +108,7 @@ fn hash_access_token(token: &str) -> Result<String> {
    let params = if cfg!(debug_assertions) {
        scrypt::Params::new(1, 1, 1).unwrap()
    } else {
-        scrypt::Params::recommended()
+        scrypt::Params::new(14, 8, 1).unwrap()
    };

    Ok(Scrypt
@@ -112,7 +131,21 @@ pub fn encrypt_access_token(access_token: &str, public_key: String) -> Result<St
    Ok(encrypted_access_token)
 }

-pub fn verify_access_token(token: &str, hash: &str) -> Result<bool> {
-    let hash = PasswordHash::new(hash).map_err(anyhow::Error::new)?;
-    Ok(Scrypt.verify_password(token.as_bytes(), &hash).is_ok())
+pub async fn verify_access_token(token: &str, user_id: UserId, db: &Arc<Database>) -> Result<bool> {
+    let token: AccessTokenJson = serde_json::from_str(&token)?;
+
+    let db_token = db.get_access_token(token.id).await?;
+    if db_token.user_id != user_id {
+        return Err(anyhow!("no such access token"))?;
+    }
+
+    let db_hash = PasswordHash::new(&db_token.hash).map_err(anyhow::Error::new)?;
+    let t0 = Instant::now();
+    let is_valid = Scrypt
+        .verify_password(token.token.as_bytes(), &db_hash)
+        .is_ok();
+    let duration = t0.elapsed();
+    log::info!("hashed access token in {:?}", duration);
+    METRIC_ACCESS_TOKEN_HASHING_TIME.observe(duration.as_millis() as f64);
+    Ok(is_valid)
 }
--- a/crates/collab/src/bin/seed.rs
+++ b/crates/collab/src/bin/seed.rs
@@ -1,4 +1,4 @@
-use collab::db;
+use collab::{db, executor::Executor};
 use db::{ConnectOptions, Database};
 use serde::{de::DeserializeOwned, Deserialize};
 use std::fmt::Write;
@@ -13,7 +13,7 @@ struct GitHubUser {
 #[tokio::main]
 async fn main() {
    let database_url = std::env::var("DATABASE_URL").expect("missing DATABASE_URL env var");
-    let db = Database::new(ConnectOptions::new(database_url))
+    let db = Database::new(ConnectOptions::new(database_url), Executor::Production)
        .await
        .expect("failed to connect to postgres database");
    let github_token = std::env::var("GITHUB_TOKEN").expect("missing GITHUB_TOKEN env var");
--- a/crates/collab/src/db.rs
+++ b/crates/collab/src/db.rs
@@ -15,6 +15,7 @@ mod worktree;
 mod worktree_diagnostic_summary;
 mod worktree_entry;

+use crate::executor::Executor;
 use crate::{Error, Result};
 use anyhow::anyhow;
 use collections::{BTreeMap, HashMap, HashSet};
@@ -22,6 +23,8 @@ pub use contact::Contact;
 use dashmap::DashMap;
 use futures::StreamExt;
 use hyper::StatusCode;
+use rand::prelude::StdRng;
+use rand::{Rng, SeedableRng};
 use rpc::{proto, ConnectionId};
 use sea_orm::Condition;
 pub use sea_orm::ConnectOptions;
@@ -46,20 +49,20 @@ pub struct Database {
    options: ConnectOptions,
    pool: DatabaseConnection,
    rooms: DashMap<RoomId, Arc<Mutex<()>>>,
-    #[cfg(test)]
-    background: Option<std::sync::Arc<gpui::executor::Background>>,
+    rng: Mutex<StdRng>,
+    executor: Executor,
    #[cfg(test)]
    runtime: Option<tokio::runtime::Runtime>,
 }

 impl Database {
-    pub async fn new(options: ConnectOptions) -> Result<Self> {
+    pub async fn new(options: ConnectOptions, executor: Executor) -> Result<Self> {
        Ok(Self {
            options: options.clone(),
            pool: sea_orm::Database::connect(options).await?,
            rooms: DashMap::with_capacity(16384),
-            #[cfg(test)]
-            background: None,
+            rng: Mutex::new(StdRng::seed_from_u64(0)),
+            executor,
            #[cfg(test)]
            runtime: None,
        })
@@ -172,25 +175,39 @@ impl Database {
                .map(|participant| participant.user_id)
                .collect::<Vec<_>>();

-            // Delete participants who failed to reconnect.
+            // Delete participants who failed to reconnect and cancel their calls.
+            let mut canceled_calls_to_user_ids = Vec::new();
            room_participant::Entity::delete_many()
                .filter(stale_participant_filter)
                .exec(&*tx)
                .await?;
+            let called_participants = room_participant::Entity::find()
+                .filter(
+                    Condition::all()
+                        .add(
+                            room_participant::Column::CallingUserId
+                                .is_in(stale_participant_user_ids.iter().copied()),
+                        )
+                        .add(room_participant::Column::AnsweringConnectionId.is_null()),
+                )
+                .all(&*tx)
+                .await?;
+            room_participant::Entity::delete_many()
+                .filter(
+                    room_participant::Column::Id
+                        .is_in(called_participants.iter().map(|participant| participant.id)),
+                )
+                .exec(&*tx)
+                .await?;
+            canceled_calls_to_user_ids.extend(
+                called_participants
+                    .into_iter()
+                    .map(|participant| participant.user_id),
+            );

            let room = self.get_room(room_id, &tx).await?;
-            let mut canceled_calls_to_user_ids = Vec::new();
-            // Delete the room if it becomes empty and cancel pending calls.
+            // Delete the room if it becomes empty.
            if room.participants.is_empty() {
-                canceled_calls_to_user_ids.extend(
-                    room.pending_participants
-                        .iter()
-                        .map(|pending_participant| UserId::from_proto(pending_participant.user_id)),
-                );
-                room_participant::Entity::delete_many()
-                    .filter(room_participant::Column::RoomId.eq(room_id))
-                    .exec(&*tx)
-                    .await?;
                project::Entity::delete_many()
                    .filter(project::Column::RoomId.eq(room_id))
                    .exec(&*tx)
@@ -2743,16 +2760,16 @@ impl Database {

    // access tokens

-    pub async fn create_access_token_hash(
+    pub async fn create_access_token(
        &self,
        user_id: UserId,
        access_token_hash: &str,
        max_access_token_count: usize,
-    ) -> Result<()> {
+    ) -> Result<AccessTokenId> {
        self.transaction(|tx| async {
            let tx = tx;

-            access_token::ActiveModel {
+            let token = access_token::ActiveModel {
                user_id: ActiveValue::set(user_id),
                hash: ActiveValue::set(access_token_hash.into()),
                ..Default::default()
@@ -2775,26 +2792,20 @@ impl Database {
                )
                .exec(&*tx)
                .await?;
-            Ok(())
+            Ok(token.id)
        })
        .await
    }

-    pub async fn get_access_token_hashes(&self, user_id: UserId) -> Result<Vec<String>> {
-        #[derive(Copy, Clone, Debug, EnumIter, DeriveColumn)]
-        enum QueryAs {
-            Hash,
-        }
-
+    pub async fn get_access_token(
+        &self,
+        access_token_id: AccessTokenId,
+    ) -> Result<access_token::Model> {
        self.transaction(|tx| async move {
-            Ok(access_token::Entity::find()
-                .select_only()
-                .column(access_token::Column::Hash)
-                .filter(access_token::Column::UserId.eq(user_id))
-                .order_by_desc(access_token::Column::Id)
-                .into_values::<_, QueryAs>()
-                .all(&*tx)
-                .await?)
+            Ok(access_token::Entity::find_by_id(access_token_id)
+                .one(&*tx)
+                .await?
+                .ok_or_else(|| anyhow!("no such access token"))?)
        })
        .await
    }
@@ -2805,30 +2816,26 @@ impl Database {
        Fut: Send + Future<Output = Result<T>>,
    {
        let body = async {
+            let mut i = 0;
            loop {
                let (tx, result) = self.with_transaction(&f).await?;
                match result {
-                    Ok(result) => {
-                        match tx.commit().await.map_err(Into::into) {
-                            Ok(()) => return Ok(result),
-                            Err(error) => {
-                                if is_serialization_error(&error) {
-                                    // Retry (don't break the loop)
-                                } else {
-                                    return Err(error);
-                                }
+                    Ok(result) => match tx.commit().await.map_err(Into::into) {
+                        Ok(()) => return Ok(result),
+                        Err(error) => {
+                            if !self.retry_on_serialization_error(&error, i).await {
+                                return Err(error);
                            }
                        }
-                    }
+                    },
                    Err(error) => {
                        tx.rollback().await?;
-                        if is_serialization_error(&error) {
-                            // Retry (don't break the loop)
-                        } else {
+                        if !self.retry_on_serialization_error(&error, i).await {
                            return Err(error);
                        }
                    }
                }
+                i += 1;
            }
        };

@@ -2841,6 +2848,7 @@ impl Database {
        Fut: Send + Future<Output = Result<Option<(RoomId, T)>>>,
    {
        let body = async {
+            let mut i = 0;
            loop {
                let (tx, result) = self.with_transaction(&f).await?;
                match result {
@@ -2856,35 +2864,28 @@ impl Database {
                                }));
                            }
                            Err(error) => {
-                                if is_serialization_error(&error) {
-                                    // Retry (don't break the loop)
-                                } else {
+                                if !self.retry_on_serialization_error(&error, i).await {
                                    return Err(error);
                                }
                            }
                        }
                    }
-                    Ok(None) => {
-                        match tx.commit().await.map_err(Into::into) {
-                            Ok(()) => return Ok(None),
-                            Err(error) => {
-                                if is_serialization_error(&error) {
-                                    // Retry (don't break the loop)
-                                } else {
-                                    return Err(error);
-                                }
+                    Ok(None) => match tx.commit().await.map_err(Into::into) {
+                        Ok(()) => return Ok(None),
+                        Err(error) => {
+                            if !self.retry_on_serialization_error(&error, i).await {
+                                return Err(error);
                            }
                        }
-                    }
+                    },
                    Err(error) => {
                        tx.rollback().await?;
-                        if is_serialization_error(&error) {
-                            // Retry (don't break the loop)
-                        } else {
+                        if !self.retry_on_serialization_error(&error, i).await {
                            return Err(error);
                        }
                    }
                }
+                i += 1;
            }
        };

@@ -2897,38 +2898,34 @@ impl Database {
        Fut: Send + Future<Output = Result<T>>,
    {
        let body = async {
+            let mut i = 0;
            loop {
                let lock = self.rooms.entry(room_id).or_default().clone();
                let _guard = lock.lock_owned().await;
                let (tx, result) = self.with_transaction(&f).await?;
                match result {
-                    Ok(data) => {
-                        match tx.commit().await.map_err(Into::into) {
-                            Ok(()) => {
-                                return Ok(RoomGuard {
-                                    data,
-                                    _guard,
-                                    _not_send: PhantomData,
-                                });
-                            }
-                            Err(error) => {
-                                if is_serialization_error(&error) {
-                                    // Retry (don't break the loop)
-                                } else {
-                                    return Err(error);
-                                }
+                    Ok(data) => match tx.commit().await.map_err(Into::into) {
+                        Ok(()) => {
+                            return Ok(RoomGuard {
+                                data,
+                                _guard,
+                                _not_send: PhantomData,
+                            });
+                        }
+                        Err(error) => {
+                            if !self.retry_on_serialization_error(&error, i).await {
+                                return Err(error);
                            }
                        }
-                    }
+                    },
                    Err(error) => {
                        tx.rollback().await?;
-                        if is_serialization_error(&error) {
-                            // Retry (don't break the loop)
-                        } else {
+                        if !self.retry_on_serialization_error(&error, i).await {
                            return Err(error);
                        }
                    }
                }
+                i += 1;
            }
        };

@@ -2954,14 +2951,14 @@ impl Database {
        Ok((tx, result))
    }

-    async fn run<F, T>(&self, future: F) -> T
+    async fn run<F, T>(&self, future: F) -> Result<T>
    where
-        F: Future<Output = T>,
+        F: Future<Output = Result<T>>,
    {
        #[cfg(test)]
        {
-            if let Some(background) = self.background.as_ref() {
-                background.simulate_random_delay().await;
+            if let Executor::Deterministic(executor) = &self.executor {
+                executor.simulate_random_delay().await;
            }

            self.runtime.as_ref().unwrap().block_on(future)
@@ -2972,6 +2969,27 @@ impl Database {
            future.await
        }
    }
+
+    async fn retry_on_serialization_error(&self, error: &Error, prev_attempt_count: u32) -> bool {
+        // If the error is due to a failure to serialize concurrent transactions, then retry
+        // this transaction after a delay. With each subsequent retry, double the delay duration.
+        // Also vary the delay randomly in order to ensure different database connections retry
+        // at different times.
+        if is_serialization_error(error) {
+            let base_delay = 4_u64 << prev_attempt_count.min(16);
+            let randomized_delay = base_delay as f32 * self.rng.lock().await.gen_range(0.5..=2.0);
+            log::info!(
+                "retrying transaction after serialization error. delay: {} ms.",
+                randomized_delay
+            );
+            self.executor
+                .sleep(Duration::from_millis(randomized_delay as u64))
+                .await;
+            true
+        } else {
+            false
+        }
+    }
 }

 fn is_serialization_error(error: &Error) -> bool {
@@ -3273,7 +3291,6 @@ mod test {
    use gpui::executor::Background;
    use lazy_static::lazy_static;
    use parking_lot::Mutex;
-    use rand::prelude::*;
    use sea_orm::ConnectionTrait;
    use sqlx::migrate::MigrateDatabase;
    use std::sync::Arc;
@@ -3295,7 +3312,9 @@ mod test {
            let mut db = runtime.block_on(async {
                let mut options = ConnectOptions::new(url);
                options.max_connections(5);
-                let db = Database::new(options).await.unwrap();
+                let db = Database::new(options, Executor::Deterministic(background))
+                    .await
+                    .unwrap();
                let sql = include_str!(concat!(
                    env!("CARGO_MANIFEST_DIR"),
                    "/migrations.sqlite/20221109000000_test_schema.sql"
@@ -3310,7 +3329,6 @@ mod test {
                db
            });

-            db.background = Some(background);
            db.runtime = Some(runtime);

            Self {
@@ -3344,13 +3362,14 @@ mod test {
                options
                    .max_connections(5)
                    .idle_timeout(Duration::from_secs(0));
-                let db = Database::new(options).await.unwrap();
+                let db = Database::new(options, Executor::Deterministic(background))
+                    .await
+                    .unwrap();
                let migrations_path = concat!(env!("CARGO_MANIFEST_DIR"), "/migrations");
                db.migrate(Path::new(migrations_path), false).await.unwrap();
                db
            });

-            db.background = Some(background);
            db.runtime = Some(runtime);

            Self {
--- a/crates/collab/src/db/tests.rs
+++ b/crates/collab/src/db/tests.rs
@@ -177,30 +177,63 @@ test_both_dbs!(
            .unwrap()
            .user_id;

-        db.create_access_token_hash(user, "h1", 3).await.unwrap();
-        db.create_access_token_hash(user, "h2", 3).await.unwrap();
+        let token_1 = db.create_access_token(user, "h1", 2).await.unwrap();
+        let token_2 = db.create_access_token(user, "h2", 2).await.unwrap();
        assert_eq!(
-            db.get_access_token_hashes(user).await.unwrap(),
-            &["h2".to_string(), "h1".to_string()]
+            db.get_access_token(token_1).await.unwrap(),
+            access_token::Model {
+                id: token_1,
+                user_id: user,
+                hash: "h1".into(),
+            }
+        );
+        assert_eq!(
+            db.get_access_token(token_2).await.unwrap(),
+            access_token::Model {
+                id: token_2,
+                user_id: user,
+                hash: "h2".into()
+            }
        );

-        db.create_access_token_hash(user, "h3", 3).await.unwrap();
+        let token_3 = db.create_access_token(user, "h3", 2).await.unwrap();
        assert_eq!(
-            db.get_access_token_hashes(user).await.unwrap(),
-            &["h3".to_string(), "h2".to_string(), "h1".to_string(),]
+            db.get_access_token(token_3).await.unwrap(),
+            access_token::Model {
+                id: token_3,
+                user_id: user,
+                hash: "h3".into()
+            }
        );
+        assert_eq!(
+            db.get_access_token(token_2).await.unwrap(),
+            access_token::Model {
+                id: token_2,
+                user_id: user,
+                hash: "h2".into()
+            }
+        );
+        assert!(db.get_access_token(token_1).await.is_err());

-        db.create_access_token_hash(user, "h4", 3).await.unwrap();
+        let token_4 = db.create_access_token(user, "h4", 2).await.unwrap();
        assert_eq!(
-            db.get_access_token_hashes(user).await.unwrap(),
-            &["h4".to_string(), "h3".to_string(), "h2".to_string(),]
+            db.get_access_token(token_4).await.unwrap(),
+            access_token::Model {
+                id: token_4,
+                user_id: user,
+                hash: "h4".into()
+            }
        );
-
-        db.create_access_token_hash(user, "h5", 3).await.unwrap();
        assert_eq!(
-            db.get_access_token_hashes(user).await.unwrap(),
-            &["h5".to_string(), "h4".to_string(), "h3".to_string()]
+            db.get_access_token(token_3).await.unwrap(),
+            access_token::Model {
+                id: token_3,
+                user_id: user,
+                hash: "h3".into()
+            }
        );
+        assert!(db.get_access_token(token_2).await.is_err());
+        assert!(db.get_access_token(token_1).await.is_err());
    }
 );

--- a/crates/collab/src/lib.rs
+++ b/crates/collab/src/lib.rs
@@ -10,6 +10,7 @@ mod tests;

 use axum::{http::StatusCode, response::IntoResponse};
 use db::Database;
+use executor::Executor;
 use serde::Deserialize;
 use std::{path::PathBuf, sync::Arc};

@@ -118,7 +119,7 @@ impl AppState {
    pub async fn new(config: Config) -> Result<Arc<Self>> {
        let mut db_options = db::ConnectOptions::new(config.database_url.clone());
        db_options.max_connections(config.database_max_connections);
-        let db = Database::new(db_options).await?;
+        let db = Database::new(db_options, Executor::Production).await?;
        let live_kit_client = if let Some(((server, key), secret)) = config
            .live_kit_server
            .as_ref()
--- a/crates/collab/src/main.rs
+++ b/crates/collab/src/main.rs
@@ -32,7 +32,7 @@ async fn main() -> Result<()> {
            let config = envy::from_env::<MigrateConfig>().expect("error loading config");
            let mut db_options = db::ConnectOptions::new(config.database_url.clone());
            db_options.max_connections(5);
-            let db = Database::new(db_options).await?;
+            let db = Database::new(db_options, Executor::Production).await?;

            let migrations_path = config
                .migrations_path
--- a/crates/collab/src/rpc.rs
+++ b/crates/collab/src/rpc.rs
@@ -228,7 +228,7 @@ impl Server {
            .add_message_handler(update_buffer_file)
            .add_message_handler(buffer_reloaded)
            .add_message_handler(buffer_saved)
-            .add_request_handler(save_buffer)
+            .add_request_handler(forward_project_request::<proto::SaveBuffer>)
            .add_request_handler(get_users)
            .add_request_handler(fuzzy_search_users)
            .add_request_handler(request_contact)
@@ -1591,51 +1591,6 @@ where
    Ok(())
 }

-async fn save_buffer(
-    request: proto::SaveBuffer,
-    response: Response<proto::SaveBuffer>,
-    session: Session,
-) -> Result<()> {
-    let project_id = ProjectId::from_proto(request.project_id);
-    let host_connection_id = {
-        let collaborators = session
-            .db()
-            .await
-            .project_collaborators(project_id, session.connection_id)
-            .await?;
-        collaborators
-            .iter()
-            .find(|collaborator| collaborator.is_host)
-            .ok_or_else(|| anyhow!("host not found"))?
-            .connection_id
-    };
-    let response_payload = session
-        .peer
-        .forward_request(session.connection_id, host_connection_id, request.clone())
-        .await?;
-
-    let mut collaborators = session
-        .db()
-        .await
-        .project_collaborators(project_id, session.connection_id)
-        .await?;
-    collaborators.retain(|collaborator| collaborator.connection_id != session.connection_id);
-    let project_connection_ids = collaborators
-        .iter()
-        .map(|collaborator| collaborator.connection_id);
-    broadcast(
-        Some(host_connection_id),
-        project_connection_ids,
-        |conn_id| {
-            session
-                .peer
-                .forward_send(host_connection_id, conn_id, response_payload.clone())
-        },
-    );
-    response.send(response_payload)?;
-    Ok(())
-}
-
 async fn create_buffer_for_peer(
    request: proto::CreateBufferForPeer,
    session: Session,
@@ -1655,23 +1610,42 @@ async fn update_buffer(
 ) -> Result<()> {
    session.executor.record_backtrace();
    let project_id = ProjectId::from_proto(request.project_id);
-    let project_connection_ids = session
-        .db()
-        .await
-        .project_connection_ids(project_id, session.connection_id)
-        .await?;
+    let mut guest_connection_ids;
+    let mut host_connection_id = None;
+    {
+        let collaborators = session
+            .db()
+            .await
+            .project_collaborators(project_id, session.connection_id)
+            .await?;
+        guest_connection_ids = Vec::with_capacity(collaborators.len() - 1);
+        for collaborator in collaborators.iter() {
+            if collaborator.is_host {
+                host_connection_id = Some(collaborator.connection_id);
+            } else {
+                guest_connection_ids.push(collaborator.connection_id);
+            }
+        }
+    }
+    let host_connection_id = host_connection_id.ok_or_else(|| anyhow!("host not found"))?;

    session.executor.record_backtrace();
-
    broadcast(
        Some(session.connection_id),
-        project_connection_ids.iter().copied(),
+        guest_connection_ids,
        |connection_id| {
            session
                .peer
                .forward_send(session.connection_id, connection_id, request.clone())
        },
    );
+    if host_connection_id != session.connection_id {
+        session
+            .peer
+            .forward_request(session.connection_id, host_connection_id, request.clone())
+            .await?;
+    }
+
    response.send(proto::Ack {})?;
    Ok(())
 }
--- a/crates/collab/src/tests.rs
+++ b/crates/collab/src/tests.rs
@@ -7,29 +7,28 @@ use crate::{
 use anyhow::anyhow;
 use call::ActiveCall;
 use client::{
-    self, proto::PeerId, test::FakeHttpClient, Client, Connection, Credentials,
-    EstablishConnectionError, UserStore,
+    self, proto::PeerId, Client, Connection, Credentials, EstablishConnectionError, UserStore,
 };
 use collections::{HashMap, HashSet};
 use fs::FakeFs;
 use futures::{channel::oneshot, StreamExt as _};
-use gpui::{
-    executor::Deterministic, test::EmptyView, ModelHandle, Task, TestAppContext, ViewHandle,
-};
+use gpui::{executor::Deterministic, test::EmptyView, ModelHandle, TestAppContext, ViewHandle};
 use language::LanguageRegistry;
 use parking_lot::Mutex;
 use project::{Project, WorktreeId};
 use settings::Settings;
 use std::{
+    cell::{Ref, RefCell, RefMut},
    env,
-    ops::Deref,
-    path::{Path, PathBuf},
+    ops::{Deref, DerefMut},
+    path::Path,
    sync::{
        atomic::{AtomicBool, AtomicUsize, Ordering::SeqCst},
        Arc,
    },
 };
 use theme::ThemeRegistry;
+use util::http::FakeHttpClient;
 use workspace::Workspace;

 mod integration_tests;
@@ -188,7 +187,7 @@ impl TestServer {
        let app_state = Arc::new(workspace::AppState {
            client: client.clone(),
            user_store: user_store.clone(),
-            languages: Arc::new(LanguageRegistry::new(Task::ready(()))),
+            languages: Arc::new(LanguageRegistry::test()),
            themes: ThemeRegistry::new((), cx.font_cache()),
            fs: fs.clone(),
            build_window_options: |_, _, _| Default::default(),
@@ -211,13 +210,10 @@ impl TestServer {
        let client = TestClient {
            client,
            username: name.to_string(),
-            local_projects: Default::default(),
-            remote_projects: Default::default(),
-            next_root_dir_id: 0,
+            state: Default::default(),
            user_store,
            fs,
            language_registry: Arc::new(LanguageRegistry::test()),
-            buffers: Default::default(),
        };
        client.wait_for_current_user(cx).await;
        client
@@ -316,12 +312,16 @@ impl Drop for TestServer {
 struct TestClient {
    client: Arc<Client>,
    username: String,
-    local_projects: Vec<ModelHandle<Project>>,
-    remote_projects: Vec<ModelHandle<Project>>,
-    next_root_dir_id: usize,
+    state: RefCell<TestClientState>,
    pub user_store: ModelHandle<UserStore>,
    language_registry: Arc<LanguageRegistry>,
    fs: Arc<FakeFs>,
+}
+
+#[derive(Default)]
+struct TestClientState {
+    local_projects: Vec<ModelHandle<Project>>,
+    remote_projects: Vec<ModelHandle<Project>>,
    buffers: HashMap<ModelHandle<Project>, HashSet<ModelHandle<language::Buffer>>>,
 }

@@ -360,6 +360,38 @@ impl TestClient {
            .await;
    }

+    fn local_projects<'a>(&'a self) -> impl Deref<Target = Vec<ModelHandle<Project>>> + 'a {
+        Ref::map(self.state.borrow(), |state| &state.local_projects)
+    }
+
+    fn remote_projects<'a>(&'a self) -> impl Deref<Target = Vec<ModelHandle<Project>>> + 'a {
+        Ref::map(self.state.borrow(), |state| &state.remote_projects)
+    }
+
+    fn local_projects_mut<'a>(&'a self) -> impl DerefMut<Target = Vec<ModelHandle<Project>>> + 'a {
+        RefMut::map(self.state.borrow_mut(), |state| &mut state.local_projects)
+    }
+
+    fn remote_projects_mut<'a>(&'a self) -> impl DerefMut<Target = Vec<ModelHandle<Project>>> + 'a {
+        RefMut::map(self.state.borrow_mut(), |state| &mut state.remote_projects)
+    }
+
+    fn buffers_for_project<'a>(
+        &'a self,
+        project: &ModelHandle<Project>,
+    ) -> impl DerefMut<Target = HashSet<ModelHandle<language::Buffer>>> + 'a {
+        RefMut::map(self.state.borrow_mut(), |state| {
+            state.buffers.entry(project.clone()).or_default()
+        })
+    }
+
+    fn buffers<'a>(
+        &'a self,
+    ) -> impl DerefMut<Target = HashMap<ModelHandle<Project>, HashSet<ModelHandle<language::Buffer>>>> + 'a
+    {
+        RefMut::map(self.state.borrow_mut(), |state| &mut state.buffers)
+    }
+
    fn summarize_contacts(&self, cx: &TestAppContext) -> ContactsSummary {
        self.user_store.read_with(cx, |store, _| ContactsSummary {
            current: store
@@ -433,15 +465,6 @@ impl TestClient {
        let (_, root_view) = cx.add_window(|_| EmptyView);
        cx.add_view(&root_view, |cx| Workspace::test_new(project.clone(), cx))
    }
-
-    fn create_new_root_dir(&mut self) -> PathBuf {
-        format!(
-            "/{}-root-{}",
-            self.username,
-            util::post_inc(&mut self.next_root_dir_id)
-        )
-        .into()
-    }
 }

 impl Drop for TestClient {
--- a/crates/collab/src/tests/integration_tests.rs
+++ b/crates/collab/src/tests/integration_tests.rs
@@ -1633,9 +1633,7 @@ async fn test_project_reconnect(
        })
        .await
        .unwrap();
-    worktree_a2
-        .read_with(cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
-        .await;
+    deterministic.run_until_parked();
    let worktree2_id = worktree_a2.read_with(cx_a, |tree, _| {
        assert!(tree.as_local().unwrap().is_shared());
        tree.id()
@@ -1696,11 +1694,9 @@ async fn test_project_reconnect(
        .unwrap();

    // While client A is disconnected, add and remove worktrees from client A's project.
-    project_a1
-        .update(cx_a, |project, cx| {
-            project.remove_worktree(worktree2_id, cx)
-        })
-        .await;
+    project_a1.update(cx_a, |project, cx| {
+        project.remove_worktree(worktree2_id, cx)
+    });
    let (worktree_a3, _) = project_a1
        .update(cx_a, |p, cx| {
            p.find_or_create_local_worktree("/root-1/dir3", true, cx)
@@ -1744,10 +1740,6 @@ async fn test_project_reconnect(
            vec![
                "a.txt",
                "b.txt",
-                "subdir1",
-                "subdir1/c.txt",
-                "subdir1/d.txt",
-                "subdir1/e.txt",
                "subdir2",
                "subdir2/f.txt",
                "subdir2/g.txt",
@@ -1780,10 +1772,6 @@ async fn test_project_reconnect(
            vec![
                "a.txt",
                "b.txt",
-                "subdir1",
-                "subdir1/c.txt",
-                "subdir1/d.txt",
-                "subdir1/e.txt",
                "subdir2",
                "subdir2/f.txt",
                "subdir2/g.txt",
@@ -1832,18 +1820,14 @@ async fn test_project_reconnect(
        })
        .await
        .unwrap();
-    worktree_a4
-        .read_with(cx_a, |tree, _| tree.as_local().unwrap().scan_complete())
-        .await;
+    deterministic.run_until_parked();
    let worktree4_id = worktree_a4.read_with(cx_a, |tree, _| {
        assert!(tree.as_local().unwrap().is_shared());
        tree.id()
    });
-    project_a1
-        .update(cx_a, |project, cx| {
-            project.remove_worktree(worktree3_id, cx)
-        })
-        .await;
+    project_a1.update(cx_a, |project, cx| {
+        project.remove_worktree(worktree3_id, cx)
+    });
    deterministic.run_until_parked();

    // While client B is disconnected, mutate a buffer on both the host and the guest.
@@ -1875,10 +1859,6 @@ async fn test_project_reconnect(
            vec![
                "a.txt",
                "b.txt",
-                "subdir1",
-                "subdir1/c.txt",
-                "subdir1/d.txt",
-                "subdir1/e.txt",
                "subdir2",
                "subdir2/f.txt",
                "subdir2/g.txt",
--- a/crates/collab/src/tests/randomized_integration_tests.rs
+++ b/crates/collab/src/tests/randomized_integration_tests.rs
--- a/crates/collab_ui/Cargo.toml
+++ b/crates/collab_ui/Cargo.toml
@@ -42,8 +42,9 @@ workspace = { path = "../workspace" }
 anyhow = "1.0"
 futures = "0.3"
 log = "0.4"
-postage = { version = "0.4.1", features = ["futures-traits"] }
-serde = { version = "1.0", features = ["derive", "rc"] }
+postage = { workspace = true }
+serde = { workspace = true }
+serde_derive = { workspace = true }

 [dev-dependencies]
 call = { path = "../call", features = ["test-support"] }
--- a/crates/collab_ui/src/collab_titlebar_item.rs
+++ b/crates/collab_ui/src/collab_titlebar_item.rs
@@ -15,8 +15,9 @@ use gpui::{
    geometry::{rect::RectF, vector::vec2f, PathBuilder},
    impl_internal_actions,
    json::{self, ToJson},
-    CursorStyle, Entity, ImageData, ModelHandle, MouseButton, MutableAppContext, RenderContext,
-    Subscription, View, ViewContext, ViewHandle, WeakViewHandle,
+    platform::{CursorStyle, MouseButton},
+    AppContext, Entity, ImageData, ModelHandle, RenderContext, Subscription, View, ViewContext,
+    ViewHandle, WeakViewHandle,
 };
 use settings::Settings;
 use std::{ops::Range, sync::Arc};
@@ -40,7 +41,7 @@ impl_internal_actions!(collab, [LeaveCall]);
 #[derive(Copy, Clone, PartialEq)]
 pub(crate) struct LeaveCall;

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(CollabTitlebarItem::toggle_collaborator_list_popover);
    cx.add_action(CollabTitlebarItem::toggle_contacts_popover);
    cx.add_action(CollabTitlebarItem::share_project);
@@ -89,7 +90,7 @@ impl View for CollabTitlebarItem {
        let theme = cx.global::<Settings>().theme.clone();

        let mut left_container = Flex::row();
-        let mut right_container = Flex::row();
+        let mut right_container = Flex::row().align_children_center();

        left_container.add_child(
            Label::new(project_title, theme.workspace.titlebar.title.clone())
@@ -117,6 +118,7 @@ impl View for CollabTitlebarItem {

        let status = workspace.read(cx).client().status();
        let status = &*status.borrow();
+
        if matches!(status, client::Status::Connected { .. }) {
            right_container.add_child(self.render_toggle_contacts_button(&theme, cx));
            right_container.add_child(self.render_user_menu_button(&theme, cx));
@@ -300,42 +302,17 @@ impl CollabTitlebarItem {
                            .with_style(item_style.container)
                            .boxed()
                    })),
-                    ContextMenuItem::Item {
-                        label: "Sign out".into(),
-                        action: Box::new(SignOut),
-                    },
-                    ContextMenuItem::Item {
-                        label: "Give Feedback".into(),
-                        action: Box::new(feedback::feedback_editor::GiveFeedback),
-                    },
+                    ContextMenuItem::item("Sign out", SignOut),
+                    ContextMenuItem::item("Send Feedback", feedback::feedback_editor::GiveFeedback),
                ]
            } else {
                vec![
-                    ContextMenuItem::Item {
-                        label: "Sign in".into(),
-                        action: Box::new(SignIn),
-                    },
-                    ContextMenuItem::Item {
-                        label: "Give Feedback".into(),
-                        action: Box::new(feedback::feedback_editor::GiveFeedback),
-                    },
+                    ContextMenuItem::item("Sign in", SignIn),
+                    ContextMenuItem::item("Send Feedback", feedback::feedback_editor::GiveFeedback),
                ]
            };

-            user_menu.show(
-                vec2f(
-                    theme
-                        .workspace
-                        .titlebar
-                        .user_menu_button
-                        .default
-                        .button_width,
-                    theme.workspace.titlebar.height,
-                ),
-                AnchorCorner::TopRight,
-                items,
-                cx,
-            );
+            user_menu.show(Default::default(), AnchorCorner::TopRight, items, cx);
        });
    }

@@ -402,7 +379,6 @@ impl CollabTitlebarItem {
                    theme.tooltip.clone(),
                    cx,
                )
-                .aligned()
                .boxed(),
            )
            .with_children(badge)
@@ -419,10 +395,10 @@ impl CollabTitlebarItem {
        let icon;
        let tooltip;
        if room.read(cx).is_screen_sharing() {
-            icon = "icons/disable_screen_sharing_12.svg";
+            icon = "icons/enable_screen_sharing_12.svg";
            tooltip = "Stop Sharing Screen"
        } else {
-            icon = "icons/enable_screen_sharing_12.svg";
+            icon = "icons/disable_screen_sharing_12.svg";
            tooltip = "Share Screen";
        }

@@ -547,10 +523,15 @@ impl CollabTitlebarItem {
                )
                .contained()
                .with_margin_left(theme.workspace.titlebar.item_spacing)
-                .aligned()
                .boxed(),
            )
-            .with_child(ChildView::new(&self.user_menu, cx).boxed())
+            .with_child(
+                ChildView::new(&self.user_menu, cx)
+                    .aligned()
+                    .bottom()
+                    .right()
+                    .boxed(),
+            )
            .boxed()
    }

@@ -572,22 +553,18 @@ impl CollabTitlebarItem {

    fn render_contacts_popover_host<'a>(
        &'a self,
-        theme: &'a theme::Titlebar,
+        _theme: &'a theme::Titlebar,
        cx: &'a RenderContext<Self>,
    ) -> Option<ElementBox> {
        self.contacts_popover.as_ref().map(|popover| {
-            Overlay::new(
-                ChildView::new(popover, cx)
-                    .contained()
-                    .with_margin_top(theme.height)
-                    .with_margin_left(theme.toggle_contacts_button.default.button_width)
-                    .with_margin_right(-theme.toggle_contacts_button.default.button_width)
-                    .boxed(),
-            )
-            .with_fit_mode(OverlayFitMode::SwitchAnchor)
-            .with_anchor_corner(AnchorCorner::BottomLeft)
-            .with_z_index(999)
-            .boxed()
+            Overlay::new(ChildView::new(popover, cx).boxed())
+                .with_fit_mode(OverlayFitMode::SwitchAnchor)
+                .with_anchor_corner(AnchorCorner::TopRight)
+                .with_z_index(999)
+                .aligned()
+                .bottom()
+                .right()
+                .boxed()
        })
    }

--- a/crates/collab_ui/src/collab_ui.rs
+++ b/crates/collab_ui/src/collab_ui.rs
@@ -13,13 +13,13 @@ mod sharing_status_indicator;
 use anyhow::anyhow;
 use call::ActiveCall;
 pub use collab_titlebar_item::{CollabTitlebarItem, ToggleContactsMenu};
-use gpui::{actions, MutableAppContext, Task};
+use gpui::{actions, AppContext, Task};
 use std::sync::Arc;
 use workspace::{AppState, JoinProject, ToggleFollow, Workspace};

 actions!(collab, [ToggleScreenSharing]);

-pub fn init(app_state: Arc<AppState>, cx: &mut MutableAppContext) {
+pub fn init(app_state: Arc<AppState>, cx: &mut AppContext) {
    collab_titlebar_item::init(cx);
    contact_notification::init(cx);
    contact_list::init(cx);
@@ -35,7 +35,7 @@ pub fn init(app_state: Arc<AppState>, cx: &mut MutableAppContext) {
    });
 }

-pub fn toggle_screen_sharing(_: &ToggleScreenSharing, cx: &mut MutableAppContext) {
+pub fn toggle_screen_sharing(_: &ToggleScreenSharing, cx: &mut AppContext) {
    if let Some(room) = ActiveCall::global(cx).read(cx).room().cloned() {
        let toggle_screen_sharing = room.update(cx, |room, cx| {
            if room.is_screen_sharing() {
@@ -48,13 +48,13 @@ pub fn toggle_screen_sharing(_: &ToggleScreenSharing, cx: &mut MutableAppContext
    }
 }

-fn join_project(action: &JoinProject, app_state: Arc<AppState>, cx: &mut MutableAppContext) {
+fn join_project(action: &JoinProject, app_state: Arc<AppState>, cx: &mut AppContext) {
    let project_id = action.project_id;
    let follow_user_id = action.follow_user_id;
    cx.spawn(|mut cx| async move {
        let existing_workspace = cx.update(|cx| {
            cx.window_ids()
-                .filter_map(|window_id| cx.root_view::<Workspace>(window_id))
+                .filter_map(|window_id| cx.root_view(window_id)?.clone().downcast::<Workspace>())
                .find(|workspace| {
                    workspace.read(cx).project().read(cx).remote_id() == Some(project_id)
                })
--- a/crates/collab_ui/src/collaborator_list_popover.rs
+++ b/crates/collab_ui/src/collaborator_list_popover.rs
@@ -2,7 +2,8 @@ use call::ActiveCall;
 use client::UserStore;
 use gpui::Action;
 use gpui::{
-    actions, elements::*, Entity, ModelHandle, MouseButton, RenderContext, View, ViewContext,
+    actions, elements::*, platform::MouseButton, Entity, ModelHandle, RenderContext, View,
+    ViewContext,
 };
 use settings::Settings;

--- a/crates/collab_ui/src/contact_finder.rs
+++ b/crates/collab_ui/src/contact_finder.rs
@@ -1,14 +1,14 @@
 use client::{ContactRequestStatus, User, UserStore};
 use gpui::{
-    elements::*, AnyViewHandle, AppContext, Entity, ModelHandle, MouseState, MutableAppContext,
-    RenderContext, Task, View, ViewContext, ViewHandle,
+    elements::*, AnyViewHandle, AppContext, Entity, ModelHandle, MouseState, RenderContext, Task,
+    View, ViewContext, ViewHandle,
 };
 use picker::{Picker, PickerDelegate};
 use settings::Settings;
 use std::sync::Arc;
 use util::TryFutureExt;

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    Picker::<ContactFinder>::init(cx);
 }

@@ -33,7 +33,7 @@ impl View for ContactFinder {
    }

    fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
-        ChildView::new(self.picker.clone(), cx).boxed()
+        ChildView::new(&self.picker, cx).boxed()
    }

    fn focus_in(&mut self, _: AnyViewHandle, cx: &mut ViewContext<Self>) {
--- a/crates/collab_ui/src/contact_list.rs
+++ b/crates/collab_ui/src/contact_list.rs
@@ -10,8 +10,8 @@ use gpui::{
    geometry::{rect::RectF, vector::vec2f},
    impl_actions, impl_internal_actions,
    keymap_matcher::KeymapContext,
-    AppContext, CursorStyle, Entity, ModelHandle, MouseButton, MutableAppContext, PromptLevel,
-    RenderContext, Subscription, View, ViewContext, ViewHandle,
+    platform::{CursorStyle, MouseButton, PromptLevel},
+    AppContext, Entity, ModelHandle, RenderContext, Subscription, View, ViewContext, ViewHandle,
 };
 use menu::{Confirm, SelectNext, SelectPrev};
 use project::Project;
@@ -24,7 +24,7 @@ use workspace::{JoinProject, OpenSharedScreen};
 impl_actions!(contact_list, [RemoveContact, RespondToContactRequest]);
 impl_internal_actions!(contact_list, [ToggleExpanded, Call]);

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(ContactList::remove_contact);
    cx.add_action(ContactList::respond_to_contact_request);
    cx.add_action(ContactList::cancel);
@@ -316,12 +316,20 @@ impl ContactList {
            github_login
        );
        let mut answer = cx.prompt(PromptLevel::Warning, &prompt_message, &["Remove", "Cancel"]);
+        let window_id = cx.window_id();
        cx.spawn(|_, mut cx| async move {
            if answer.next().await == Some(0) {
-                user_store
+                if let Err(e) = user_store
                    .update(&mut cx, |store, cx| store.remove_contact(user_id, cx))
                    .await
-                    .unwrap();
+                {
+                    cx.prompt(
+                        window_id,
+                        PromptLevel::Info,
+                        &format!("Failed to remove contact: {}", e),
+                        &["Ok"],
+                    );
+                }
            }
        })
        .detach();
@@ -1331,7 +1339,7 @@ impl View for ContactList {
            .with_child(
                Flex::row()
                    .with_child(
-                        ChildView::new(self.filter_editor.clone(), cx)
+                        ChildView::new(&self.filter_editor, cx)
                            .contained()
                            .with_style(theme.contact_list.user_query_editor.container)
                            .flex(1., true)
--- a/crates/collab_ui/src/contact_notification.rs
+++ b/crates/collab_ui/src/contact_notification.rs
@@ -3,14 +3,14 @@ use std::sync::Arc;
 use crate::notifications::render_user_notification;
 use client::{ContactEventKind, User, UserStore};
 use gpui::{
-    elements::*, impl_internal_actions, Entity, ModelHandle, MutableAppContext, RenderContext,
-    View, ViewContext,
+    elements::*, impl_internal_actions, AppContext, Entity, ModelHandle, RenderContext, View,
+    ViewContext,
 };
 use workspace::notifications::Notification;

 impl_internal_actions!(contact_notifications, [Dismiss, RespondToContactRequest]);

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(ContactNotification::dismiss);
    cx.add_action(ContactNotification::respond_to_contact_request);
 }
--- a/crates/collab_ui/src/contacts_popover.rs
+++ b/crates/collab_ui/src/contacts_popover.rs
@@ -1,15 +1,15 @@
 use crate::{contact_finder::ContactFinder, contact_list::ContactList, ToggleContactsMenu};
 use client::UserStore;
 use gpui::{
-    actions, elements::*, Entity, ModelHandle, MouseButton, MutableAppContext, RenderContext, View,
-    ViewContext, ViewHandle,
+    actions, elements::*, platform::MouseButton, AppContext, Entity, ModelHandle, RenderContext,
+    View, ViewContext, ViewHandle,
 };
 use project::Project;
 use settings::Settings;

 actions!(contacts_popover, [ToggleContactFinder]);

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(ContactsPopover::toggle_contact_finder);
 }

--- a/crates/collab_ui/src/incoming_call_notification.rs
+++ b/crates/collab_ui/src/incoming_call_notification.rs
@@ -4,8 +4,9 @@ use futures::StreamExt;
 use gpui::{
    elements::*,
    geometry::{rect::RectF, vector::vec2f},
-    impl_internal_actions, CursorStyle, Entity, MouseButton, MutableAppContext, RenderContext,
-    View, ViewContext, WindowBounds, WindowKind, WindowOptions,
+    impl_internal_actions,
+    platform::{CursorStyle, MouseButton, WindowBounds, WindowKind, WindowOptions},
+    AppContext, Entity, RenderContext, View, ViewContext,
 };
 use settings::Settings;
 use util::ResultExt;
@@ -13,7 +14,7 @@ use workspace::JoinProject;

 impl_internal_actions!(incoming_call_notification, [RespondToCall]);

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(IncomingCallNotification::respond_to_call);

    let mut incoming_call = ActiveCall::global(cx).read(cx).incoming();
--- a/crates/collab_ui/src/notifications.rs
+++ b/crates/collab_ui/src/notifications.rs
@@ -1,7 +1,8 @@
 use client::User;
 use gpui::{
-    elements::*, platform::CursorStyle, Action, Element, ElementBox, MouseButton, RenderContext,
-    View,
+    elements::*,
+    platform::{CursorStyle, MouseButton},
+    Action, Element, ElementBox, RenderContext, View,
 };
 use settings::Settings;
 use std::sync::Arc;
--- a/crates/collab_ui/src/project_shared_notification.rs
+++ b/crates/collab_ui/src/project_shared_notification.rs
@@ -5,8 +5,8 @@ use gpui::{
    actions,
    elements::*,
    geometry::{rect::RectF, vector::vec2f},
-    CursorStyle, Entity, MouseButton, MutableAppContext, RenderContext, View, ViewContext,
-    WindowBounds, WindowKind, WindowOptions,
+    platform::{CursorStyle, MouseButton, WindowBounds, WindowKind, WindowOptions},
+    AppContext, Entity, RenderContext, View, ViewContext,
 };
 use settings::Settings;
 use std::sync::Arc;
@@ -14,7 +14,7 @@ use workspace::JoinProject;

 actions!(project_shared_notification, [DismissProject]);

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(ProjectSharedNotification::join);
    cx.add_action(ProjectSharedNotification::dismiss);

--- a/crates/collab_ui/src/sharing_status_indicator.rs
+++ b/crates/collab_ui/src/sharing_status_indicator.rs
@@ -2,13 +2,14 @@ use call::ActiveCall;
 use gpui::{
    color::Color,
    elements::{MouseEventHandler, Svg},
-    Appearance, Element, ElementBox, Entity, MouseButton, MutableAppContext, RenderContext, View,
+    platform::{Appearance, MouseButton},
+    AppContext, Element, ElementBox, Entity, RenderContext, View,
 };
 use settings::Settings;

 use crate::ToggleScreenSharing;

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    let active_call = ActiveCall::global(cx);

    let mut status_indicator = None;
@@ -21,6 +22,8 @@ pub fn init(cx: &mut MutableAppContext) {
            } else if let Some((window_id, _)) = status_indicator.take() {
                cx.remove_status_bar_item(window_id);
            }
+        } else if let Some((window_id, _)) = status_indicator.take() {
+            cx.remove_status_bar_item(window_id);
        }
    })
    .detach();
--- a/crates/collections/src/collections.rs
+++ b/crates/collections/src/collections.rs
@@ -24,3 +24,10 @@ pub type HashMap<K, V> = std::collections::HashMap<K, V>;
 pub type HashSet<T> = std::collections::HashSet<T>;

 pub use std::collections::*;
+
+// NEW TYPES
+
+#[derive(Default)]
+pub struct CommandPaletteFilter {
+    pub filtered_namespaces: HashSet<&'static str>,
+}
--- a/crates/command_palette/Cargo.toml
+++ b/crates/command_palette/Cargo.toml
@@ -24,7 +24,7 @@ workspace = { path = "../workspace" }
 gpui = { path = "../gpui", features = ["test-support"] }
 editor = { path = "../editor", features = ["test-support"] }
 project = { path = "../project", features = ["test-support"] }
-serde_json = { version = "1.0", features = ["preserve_order"] }
+serde_json = { workspace = true }
 workspace = { path = "../workspace", features = ["test-support"] }
 ctor = "0.1"
 env_logger = "0.9"
--- a/crates/command_palette/src/command_palette.rs
+++ b/crates/command_palette/src/command_palette.rs
@@ -1,10 +1,10 @@
-use collections::HashSet;
+use collections::CommandPaletteFilter;
 use fuzzy::{StringMatch, StringMatchCandidate};
 use gpui::{
    actions,
    elements::{ChildView, Flex, Label, ParentElement},
    keymap_matcher::Keystroke,
-    Action, AnyViewHandle, Element, Entity, MouseState, MutableAppContext, RenderContext, View,
+    Action, AnyViewHandle, AppContext, Element, Entity, MouseState, RenderContext, View,
    ViewContext, ViewHandle,
 };
 use picker::{Picker, PickerDelegate};
@@ -12,12 +12,7 @@ use settings::Settings;
 use std::cmp;
 use workspace::Workspace;

-#[derive(Default)]
-pub struct CommandPaletteFilter {
-    pub filtered_namespaces: HashSet<&'static str>,
-}
-
-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(CommandPalette::toggle);
    Picker::<CommandPalette>::init(cx);
 }
@@ -90,7 +85,7 @@ impl CommandPalette {
            .unwrap_or_else(|| workspace.id());

        cx.as_mut().defer(move |cx| {
-            let this = cx.add_view(workspace.clone(), |cx| Self::new(focused_view_id, cx));
+            let this = cx.add_view(&workspace, |cx| Self::new(focused_view_id, cx));
            workspace.update(cx, |workspace, cx| {
                workspace.toggle_modal(cx, |_, cx| {
                    cx.subscribe(&this, Self::on_event).detach();
@@ -134,7 +129,7 @@ impl View for CommandPalette {
    }

    fn render(&mut self, cx: &mut RenderContext<Self>) -> gpui::ElementBox {
-        ChildView::new(self.picker.clone(), cx).boxed()
+        ChildView::new(&self.picker, cx).boxed()
    }

    fn focus_in(&mut self, _: AnyViewHandle, cx: &mut ViewContext<Self>) {
@@ -360,7 +355,7 @@ mod tests {
        });

        workspace.update(cx, |workspace, cx| {
-            cx.focus(editor.clone());
+            cx.focus(&editor);
            workspace.add_item(Box::new(editor.clone()), cx)
        });

--- a/crates/context_menu/src/context_menu.rs
+++ b/crates/context_menu/src/context_menu.rs
@@ -1,20 +1,24 @@
 use gpui::{
-    elements::*, geometry::vector::Vector2F, impl_internal_actions, keymap_matcher::KeymapContext,
-    platform::CursorStyle, Action, AnyViewHandle, AppContext, Axis, Entity, MouseButton,
-    MutableAppContext, RenderContext, SizeConstraint, Subscription, View, ViewContext,
+    elements::*,
+    geometry::vector::Vector2F,
+    impl_internal_actions,
+    keymap_matcher::KeymapContext,
+    platform::{CursorStyle, MouseButton},
+    Action, AnyViewHandle, AppContext, Axis, Entity, MouseState, RenderContext, SizeConstraint,
+    Subscription, View, ViewContext,
 };
 use menu::*;
 use settings::Settings;
 use std::{any::TypeId, borrow::Cow, time::Duration};

-pub type StaticItem = Box<dyn Fn(&mut MutableAppContext) -> ElementBox>;
+pub type StaticItem = Box<dyn Fn(&mut AppContext) -> ElementBox>;

 #[derive(Copy, Clone, PartialEq)]
 struct Clicked;

 impl_internal_actions!(context_menu, [Clicked]);

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(ContextMenu::select_first);
    cx.add_action(ContextMenu::select_last);
    cx.add_action(ContextMenu::select_next);
@@ -24,20 +28,71 @@ pub fn init(cx: &mut MutableAppContext) {
    cx.add_action(ContextMenu::cancel);
 }

+type ContextMenuItemBuilder = Box<dyn Fn(&mut MouseState, &theme::ContextMenuItem) -> ElementBox>;
+
+pub enum ContextMenuItemLabel {
+    String(Cow<'static, str>),
+    Element(ContextMenuItemBuilder),
+}
+
+pub enum ContextMenuAction {
+    ParentAction {
+        action: Box<dyn Action>,
+    },
+    ViewAction {
+        action: Box<dyn Action>,
+        for_view: usize,
+    },
+}
+
+impl ContextMenuAction {
+    fn id(&self) -> TypeId {
+        match self {
+            ContextMenuAction::ParentAction { action } => action.id(),
+            ContextMenuAction::ViewAction { action, .. } => action.id(),
+        }
+    }
+}
+
 pub enum ContextMenuItem {
    Item {
-        label: Cow<'static, str>,
-        action: Box<dyn Action>,
+        label: ContextMenuItemLabel,
+        action: ContextMenuAction,
    },
    Static(StaticItem),
    Separator,
 }

 impl ContextMenuItem {
+    pub fn element_item(label: ContextMenuItemBuilder, action: impl 'static + Action) -> Self {
+        Self::Item {
+            label: ContextMenuItemLabel::Element(label),
+            action: ContextMenuAction::ParentAction {
+                action: Box::new(action),
+            },
+        }
+    }
+
    pub fn item(label: impl Into<Cow<'static, str>>, action: impl 'static + Action) -> Self {
        Self::Item {
-            label: label.into(),
-            action: Box::new(action),
+            label: ContextMenuItemLabel::String(label.into()),
+            action: ContextMenuAction::ParentAction {
+                action: Box::new(action),
+            },
+        }
+    }
+
+    pub fn item_for_view(
+        label: impl Into<Cow<'static, str>>,
+        view_id: usize,
+        action: impl 'static + Action,
+    ) -> Self {
+        Self::Item {
+            label: ContextMenuItemLabel::String(label.into()),
+            action: ContextMenuAction::ViewAction {
+                action: Box::new(action),
+                for_view: view_id,
+            },
        }
    }

@@ -168,7 +223,15 @@ impl ContextMenu {
    fn confirm(&mut self, _: &Confirm, cx: &mut ViewContext<Self>) {
        if let Some(ix) = self.selected_index {
            if let Some(ContextMenuItem::Item { action, .. }) = self.items.get(ix) {
-                cx.dispatch_any_action(action.boxed_clone());
+                match action {
+                    ContextMenuAction::ParentAction { action } => {
+                        cx.dispatch_any_action(action.boxed_clone())
+                    }
+                    ContextMenuAction::ViewAction { action, for_view } => {
+                        let window_id = cx.window_id();
+                        cx.dispatch_any_action_at(window_id, *for_view, action.boxed_clone())
+                    }
+                };
                self.reset(cx);
            }
        }
@@ -278,10 +341,17 @@ impl ContextMenu {
                                    Some(ix) == self.selected_index,
                                );

-                                Label::new(label.to_string(), style.label.clone())
-                                    .contained()
-                                    .with_style(style.container)
-                                    .boxed()
+                                match label {
+                                    ContextMenuItemLabel::String(label) => {
+                                        Label::new(label.to_string(), style.label.clone())
+                                            .contained()
+                                            .with_style(style.container)
+                                            .boxed()
+                                    }
+                                    ContextMenuItemLabel::Element(element) => {
+                                        element(&mut Default::default(), style)
+                                    }
+                                }
                            }

                            ContextMenuItem::Static(f) => f(cx),
@@ -306,9 +376,18 @@ impl ContextMenu {
                                    &mut Default::default(),
                                    Some(ix) == self.selected_index,
                                );
+                                let (action, view_id) = match action {
+                                    ContextMenuAction::ParentAction { action } => {
+                                        (action.boxed_clone(), self.parent_view_id)
+                                    }
+                                    ContextMenuAction::ViewAction { action, for_view } => {
+                                        (action.boxed_clone(), *for_view)
+                                    }
+                                };
+
                                KeystrokeLabel::new(
                                    window_id,
-                                    self.parent_view_id,
+                                    view_id,
                                    action.boxed_clone(),
                                    style.keystroke.container,
                                    style.keystroke.text.clone(),
@@ -347,22 +426,34 @@ impl ContextMenu {
                .with_children(self.items.iter().enumerate().map(|(ix, item)| {
                    match item {
                        ContextMenuItem::Item { label, action } => {
-                            let action = action.boxed_clone();
+                            let (action, view_id) = match action {
+                                ContextMenuAction::ParentAction { action } => {
+                                    (action.boxed_clone(), self.parent_view_id)
+                                }
+                                ContextMenuAction::ViewAction { action, for_view } => {
+                                    (action.boxed_clone(), *for_view)
+                                }
+                            };

                            MouseEventHandler::<MenuItem>::new(ix, cx, |state, _| {
                                let style =
                                    style.item.style_for(state, Some(ix) == self.selected_index);

                                Flex::row()
-                                    .with_child(
-                                        Label::new(label.clone(), style.label.clone())
-                                            .contained()
-                                            .boxed(),
-                                    )
+                                    .with_child(match label {
+                                        ContextMenuItemLabel::String(label) => {
+                                            Label::new(label.clone(), style.label.clone())
+                                                .contained()
+                                                .boxed()
+                                        }
+                                        ContextMenuItemLabel::Element(element) => {
+                                            element(state, style)
+                                        }
+                                    })
                                    .with_child({
                                        KeystrokeLabel::new(
                                            window_id,
-                                            self.parent_view_id,
+                                            view_id,
                                            action.boxed_clone(),
                                            style.keystroke.container,
                                            style.keystroke.text.clone(),
@@ -375,9 +466,12 @@ impl ContextMenu {
                                    .boxed()
                            })
                            .with_cursor_style(CursorStyle::PointingHand)
+                            .on_up(MouseButton::Left, |_, _| {}) // Capture these events
+                            .on_down(MouseButton::Left, |_, _| {}) // Capture these events
                            .on_click(MouseButton::Left, move |_, cx| {
                                cx.dispatch_action(Clicked);
-                                cx.dispatch_any_action(action.boxed_clone());
+                                let window_id = cx.window_id();
+                                cx.dispatch_any_action_at(window_id, view_id, action.boxed_clone());
                            })
                            .on_drag(MouseButton::Left, |_, _| {})
                            .boxed()
--- a/crates/copilot/Cargo.toml
+++ b/crates/copilot/Cargo.toml
@@ -0,0 +1,47 @@
+[package]
+name = "copilot"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+path = "src/copilot.rs"
+doctest = false
+
+[features]
+test-support = [
+    "collections/test-support",
+    "gpui/test-support",
+    "language/test-support",
+    "lsp/test-support",
+    "settings/test-support",
+    "util/test-support",
+]
+
+[dependencies]
+collections = { path = "../collections" }
+context_menu = { path = "../context_menu" }
+gpui = { path = "../gpui" }
+language = { path = "../language" }
+settings = { path = "../settings" }
+theme = { path = "../theme" }
+lsp = { path = "../lsp" }
+node_runtime = { path = "../node_runtime"}
+util = { path = "../util" }
+async-compression = { version = "0.3", features = ["gzip", "futures-bufread"] }
+async-tar = "0.4.2"
+anyhow = "1.0"
+log = "0.4"
+serde = { workspace = true }
+serde_derive = { workspace = true }
+smol = "1.2.5"
+futures = "0.3"
+
+[dev-dependencies]
+collections = { path = "../collections", features = ["test-support"] }
+gpui = { path = "../gpui", features = ["test-support"] }
+language = { path = "../language", features = ["test-support"] }
+settings = { path = "../settings", features = ["test-support"] }
+lsp = { path = "../lsp", features = ["test-support"] }
+util = { path = "../util", features = ["test-support"] }
+workspace = { path = "../workspace", features = ["test-support"] }
--- a/crates/copilot/src/copilot.rs
+++ b/crates/copilot/src/copilot.rs
@@ -0,0 +1,706 @@
+pub mod request;
+mod sign_in;
+
+use anyhow::{anyhow, Context, Result};
+use async_compression::futures::bufread::GzipDecoder;
+use async_tar::Archive;
+use collections::HashMap;
+use futures::{future::Shared, Future, FutureExt, TryFutureExt};
+use gpui::{actions, AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle, Task};
+use language::{point_from_lsp, point_to_lsp, Anchor, Bias, Buffer, Language, ToPointUtf16};
+use log::{debug, error};
+use lsp::LanguageServer;
+use node_runtime::NodeRuntime;
+use request::{LogMessage, StatusNotification};
+use settings::Settings;
+use smol::{fs, io::BufReader, stream::StreamExt};
+use std::{
+    ffi::OsString,
+    ops::Range,
+    path::{Path, PathBuf},
+    sync::Arc,
+};
+use util::{
+    channel::ReleaseChannel, fs::remove_matching, github::latest_github_release, http::HttpClient,
+    paths, ResultExt,
+};
+
+const COPILOT_AUTH_NAMESPACE: &'static str = "copilot_auth";
+actions!(copilot_auth, [SignIn, SignOut]);
+
+const COPILOT_NAMESPACE: &'static str = "copilot";
+actions!(copilot, [NextSuggestion, PreviousSuggestion, Reinstall]);
+
+pub fn init(http: Arc<dyn HttpClient>, node_runtime: Arc<NodeRuntime>, cx: &mut AppContext) {
+    // Disable Copilot for stable releases.
+    if *cx.global::<ReleaseChannel>() == ReleaseChannel::Stable {
+        cx.update_global::<collections::CommandPaletteFilter, _, _>(|filter, _cx| {
+            filter.filtered_namespaces.insert(COPILOT_NAMESPACE);
+            filter.filtered_namespaces.insert(COPILOT_AUTH_NAMESPACE);
+        });
+        return;
+    }
+
+    let copilot = cx.add_model({
+        let node_runtime = node_runtime.clone();
+        move |cx| Copilot::start(http, node_runtime, cx)
+    });
+    cx.set_global(copilot.clone());
+
+    cx.observe(&copilot, |handle, cx| {
+        let status = handle.read(cx).status();
+        cx.update_global::<collections::CommandPaletteFilter, _, _>(
+            move |filter, _cx| match status {
+                Status::Disabled => {
+                    filter.filtered_namespaces.insert(COPILOT_NAMESPACE);
+                    filter.filtered_namespaces.insert(COPILOT_AUTH_NAMESPACE);
+                }
+                Status::Authorized => {
+                    filter.filtered_namespaces.remove(COPILOT_NAMESPACE);
+                    filter.filtered_namespaces.remove(COPILOT_AUTH_NAMESPACE);
+                }
+                _ => {
+                    filter.filtered_namespaces.insert(COPILOT_NAMESPACE);
+                    filter.filtered_namespaces.remove(COPILOT_AUTH_NAMESPACE);
+                }
+            },
+        );
+    })
+    .detach();
+
+    sign_in::init(cx);
+    cx.add_global_action(|_: &SignIn, cx| {
+        if let Some(copilot) = Copilot::global(cx) {
+            copilot
+                .update(cx, |copilot, cx| copilot.sign_in(cx))
+                .detach_and_log_err(cx);
+        }
+    });
+    cx.add_global_action(|_: &SignOut, cx| {
+        if let Some(copilot) = Copilot::global(cx) {
+            copilot
+                .update(cx, |copilot, cx| copilot.sign_out(cx))
+                .detach_and_log_err(cx);
+        }
+    });
+
+    cx.add_global_action(|_: &Reinstall, cx| {
+        if let Some(copilot) = Copilot::global(cx) {
+            copilot
+                .update(cx, |copilot, cx| copilot.reinstall(cx))
+                .detach();
+        }
+    });
+}
+
+enum CopilotServer {
+    Disabled,
+    Starting {
+        task: Shared<Task<()>>,
+    },
+    Error(Arc<str>),
+    Started {
+        server: Arc<LanguageServer>,
+        status: SignInStatus,
+        subscriptions_by_buffer_id: HashMap<usize, gpui::Subscription>,
+    },
+}
+
+#[derive(Clone, Debug)]
+enum SignInStatus {
+    Authorized,
+    Unauthorized,
+    SigningIn {
+        prompt: Option<request::PromptUserDeviceFlow>,
+        task: Shared<Task<Result<(), Arc<anyhow::Error>>>>,
+    },
+    SignedOut,
+}
+
+#[derive(Debug, Clone)]
+pub enum Status {
+    Starting {
+        task: Shared<Task<()>>,
+    },
+    Error(Arc<str>),
+    Disabled,
+    SignedOut,
+    SigningIn {
+        prompt: Option<request::PromptUserDeviceFlow>,
+    },
+    Unauthorized,
+    Authorized,
+}
+
+impl Status {
+    pub fn is_authorized(&self) -> bool {
+        matches!(self, Status::Authorized)
+    }
+}
+
+#[derive(Debug, PartialEq, Eq)]
+pub struct Completion {
+    pub range: Range<Anchor>,
+    pub text: String,
+}
+
+pub struct Copilot {
+    http: Arc<dyn HttpClient>,
+    node_runtime: Arc<NodeRuntime>,
+    server: CopilotServer,
+}
+
+impl Entity for Copilot {
+    type Event = ();
+}
+
+impl Copilot {
+    pub fn global(cx: &AppContext) -> Option<ModelHandle<Self>> {
+        if cx.has_global::<ModelHandle<Self>>() {
+            Some(cx.global::<ModelHandle<Self>>().clone())
+        } else {
+            None
+        }
+    }
+
+    fn start(
+        http: Arc<dyn HttpClient>,
+        node_runtime: Arc<NodeRuntime>,
+        cx: &mut ModelContext<Self>,
+    ) -> Self {
+        cx.observe_global::<Settings, _>({
+            let http = http.clone();
+            let node_runtime = node_runtime.clone();
+            move |this, cx| {
+                if cx.global::<Settings>().enable_copilot_integration {
+                    if matches!(this.server, CopilotServer::Disabled) {
+                        let start_task = cx
+                            .spawn({
+                                let http = http.clone();
+                                let node_runtime = node_runtime.clone();
+                                move |this, cx| {
+                                    Self::start_language_server(http, node_runtime, this, cx)
+                                }
+                            })
+                            .shared();
+                        this.server = CopilotServer::Starting { task: start_task };
+                        cx.notify();
+                    }
+                } else {
+                    this.server = CopilotServer::Disabled;
+                    cx.notify();
+                }
+            }
+        })
+        .detach();
+
+        if cx.global::<Settings>().enable_copilot_integration {
+            let start_task = cx
+                .spawn({
+                    let http = http.clone();
+                    let node_runtime = node_runtime.clone();
+                    move |this, cx| Self::start_language_server(http, node_runtime, this, cx)
+                })
+                .shared();
+
+            Self {
+                http,
+                node_runtime,
+                server: CopilotServer::Starting { task: start_task },
+            }
+        } else {
+            Self {
+                http,
+                node_runtime,
+                server: CopilotServer::Disabled,
+            }
+        }
+    }
+
+    #[cfg(any(test, feature = "test-support"))]
+    pub fn fake(cx: &mut gpui::TestAppContext) -> (ModelHandle<Self>, lsp::FakeLanguageServer) {
+        let (server, fake_server) =
+            LanguageServer::fake("copilot".into(), Default::default(), cx.to_async());
+        let http = util::http::FakeHttpClient::create(|_| async { unreachable!() });
+        let this = cx.add_model(|cx| Self {
+            http: http.clone(),
+            node_runtime: NodeRuntime::new(http, cx.background().clone()),
+            server: CopilotServer::Started {
+                server: Arc::new(server),
+                status: SignInStatus::Authorized,
+                subscriptions_by_buffer_id: Default::default(),
+            },
+        });
+        (this, fake_server)
+    }
+
+    fn start_language_server(
+        http: Arc<dyn HttpClient>,
+        node_runtime: Arc<NodeRuntime>,
+        this: ModelHandle<Self>,
+        mut cx: AsyncAppContext,
+    ) -> impl Future<Output = ()> {
+        async move {
+            let start_language_server = async {
+                let server_path = get_copilot_lsp(http).await?;
+                let node_path = node_runtime.binary_path().await?;
+                let arguments: &[OsString] = &[server_path.into(), "--stdio".into()];
+                let server = LanguageServer::new(
+                    0,
+                    &node_path,
+                    arguments,
+                    Path::new("/"),
+                    None,
+                    cx.clone(),
+                )?;
+
+                let server = server.initialize(Default::default()).await?;
+                let status = server
+                    .request::<request::CheckStatus>(request::CheckStatusParams {
+                        local_checks_only: false,
+                    })
+                    .await?;
+
+                server
+                    .on_notification::<LogMessage, _>(|params, _cx| {
+                        match params.level {
+                            // Copilot is pretty agressive about logging
+                            0 => debug!("copilot: {}", params.message),
+                            1 => debug!("copilot: {}", params.message),
+                            _ => error!("copilot: {}", params.message),
+                        }
+
+                        debug!("copilot metadata: {}", params.metadata_str);
+                        debug!("copilot extra: {:?}", params.extra);
+                    })
+                    .detach();
+
+                server
+                    .on_notification::<StatusNotification, _>(
+                        |_, _| { /* Silence the notification */ },
+                    )
+                    .detach();
+
+                anyhow::Ok((server, status))
+            };
+
+            let server = start_language_server.await;
+            this.update(&mut cx, |this, cx| {
+                cx.notify();
+                match server {
+                    Ok((server, status)) => {
+                        this.server = CopilotServer::Started {
+                            server,
+                            status: SignInStatus::SignedOut,
+                            subscriptions_by_buffer_id: Default::default(),
+                        };
+                        this.update_sign_in_status(status, cx);
+                    }
+                    Err(error) => {
+                        this.server = CopilotServer::Error(error.to_string().into());
+                        cx.notify()
+                    }
+                }
+            })
+        }
+    }
+
+    fn sign_in(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
+        if let CopilotServer::Started { server, status, .. } = &mut self.server {
+            let task = match status {
+                SignInStatus::Authorized { .. } | SignInStatus::Unauthorized { .. } => {
+                    Task::ready(Ok(())).shared()
+                }
+                SignInStatus::SigningIn { task, .. } => {
+                    cx.notify();
+                    task.clone()
+                }
+                SignInStatus::SignedOut => {
+                    let server = server.clone();
+                    let task = cx
+                        .spawn(|this, mut cx| async move {
+                            let sign_in = async {
+                                let sign_in = server
+                                    .request::<request::SignInInitiate>(
+                                        request::SignInInitiateParams {},
+                                    )
+                                    .await?;
+                                match sign_in {
+                                    request::SignInInitiateResult::AlreadySignedIn { user } => {
+                                        Ok(request::SignInStatus::Ok { user })
+                                    }
+                                    request::SignInInitiateResult::PromptUserDeviceFlow(flow) => {
+                                        this.update(&mut cx, |this, cx| {
+                                            if let CopilotServer::Started { status, .. } =
+                                                &mut this.server
+                                            {
+                                                if let SignInStatus::SigningIn {
+                                                    prompt: prompt_flow,
+                                                    ..
+                                                } = status
+                                                {
+                                                    *prompt_flow = Some(flow.clone());
+                                                    cx.notify();
+                                                }
+                                            }
+                                        });
+                                        let response = server
+                                            .request::<request::SignInConfirm>(
+                                                request::SignInConfirmParams {
+                                                    user_code: flow.user_code,
+                                                },
+                                            )
+                                            .await?;
+                                        Ok(response)
+                                    }
+                                }
+                            };
+
+                            let sign_in = sign_in.await;
+                            this.update(&mut cx, |this, cx| match sign_in {
+                                Ok(status) => {
+                                    this.update_sign_in_status(status, cx);
+                                    Ok(())
+                                }
+                                Err(error) => {
+                                    this.update_sign_in_status(
+                                        request::SignInStatus::NotSignedIn,
+                                        cx,
+                                    );
+                                    Err(Arc::new(error))
+                                }
+                            })
+                        })
+                        .shared();
+                    *status = SignInStatus::SigningIn {
+                        prompt: None,
+                        task: task.clone(),
+                    };
+                    cx.notify();
+                    task
+                }
+            };
+
+            cx.foreground()
+                .spawn(task.map_err(|err| anyhow!("{:?}", err)))
+        } else {
+            // If we're downloading, wait until download is finished
+            // If we're in a stuck state, display to the user
+            Task::ready(Err(anyhow!("copilot hasn't started yet")))
+        }
+    }
+
+    fn sign_out(&mut self, cx: &mut ModelContext<Self>) -> Task<Result<()>> {
+        if let CopilotServer::Started { server, status, .. } = &mut self.server {
+            *status = SignInStatus::SignedOut;
+            cx.notify();
+
+            let server = server.clone();
+            cx.background().spawn(async move {
+                server
+                    .request::<request::SignOut>(request::SignOutParams {})
+                    .await?;
+                anyhow::Ok(())
+            })
+        } else {
+            Task::ready(Err(anyhow!("copilot hasn't started yet")))
+        }
+    }
+
+    fn reinstall(&mut self, cx: &mut ModelContext<Self>) -> Task<()> {
+        let start_task = cx
+            .spawn({
+                let http = self.http.clone();
+                let node_runtime = self.node_runtime.clone();
+                move |this, cx| async move {
+                    clear_copilot_dir().await;
+                    Self::start_language_server(http, node_runtime, this, cx).await
+                }
+            })
+            .shared();
+
+        self.server = CopilotServer::Starting {
+            task: start_task.clone(),
+        };
+
+        cx.notify();
+
+        cx.foreground().spawn(start_task)
+    }
+
+    pub fn completions<T>(
+        &mut self,
+        buffer: &ModelHandle<Buffer>,
+        position: T,
+        cx: &mut ModelContext<Self>,
+    ) -> Task<Result<Vec<Completion>>>
+    where
+        T: ToPointUtf16,
+    {
+        self.request_completions::<request::GetCompletions, _>(buffer, position, cx)
+    }
+
+    pub fn completions_cycling<T>(
+        &mut self,
+        buffer: &ModelHandle<Buffer>,
+        position: T,
+        cx: &mut ModelContext<Self>,
+    ) -> Task<Result<Vec<Completion>>>
+    where
+        T: ToPointUtf16,
+    {
+        self.request_completions::<request::GetCompletionsCycling, _>(buffer, position, cx)
+    }
+
+    fn request_completions<R, T>(
+        &mut self,
+        buffer: &ModelHandle<Buffer>,
+        position: T,
+        cx: &mut ModelContext<Self>,
+    ) -> Task<Result<Vec<Completion>>>
+    where
+        R: lsp::request::Request<
+            Params = request::GetCompletionsParams,
+            Result = request::GetCompletionsResult,
+        >,
+        T: ToPointUtf16,
+    {
+        let buffer_id = buffer.id();
+        let uri: lsp::Url = format!("buffer://{}", buffer_id).parse().unwrap();
+        let snapshot = buffer.read(cx).snapshot();
+        let server = match &mut self.server {
+            CopilotServer::Starting { .. } => {
+                return Task::ready(Err(anyhow!("copilot is still starting")))
+            }
+            CopilotServer::Disabled => return Task::ready(Err(anyhow!("copilot is disabled"))),
+            CopilotServer::Error(error) => {
+                return Task::ready(Err(anyhow!(
+                    "copilot was not started because of an error: {}",
+                    error
+                )))
+            }
+            CopilotServer::Started {
+                server,
+                status,
+                subscriptions_by_buffer_id,
+            } => {
+                if matches!(status, SignInStatus::Authorized { .. }) {
+                    subscriptions_by_buffer_id
+                        .entry(buffer_id)
+                        .or_insert_with(|| {
+                            server
+                                .notify::<lsp::notification::DidOpenTextDocument>(
+                                    lsp::DidOpenTextDocumentParams {
+                                        text_document: lsp::TextDocumentItem {
+                                            uri: uri.clone(),
+                                            language_id: id_for_language(
+                                                buffer.read(cx).language(),
+                                            ),
+                                            version: 0,
+                                            text: snapshot.text(),
+                                        },
+                                    },
+                                )
+                                .log_err();
+
+                            let uri = uri.clone();
+                            cx.observe_release(buffer, move |this, _, _| {
+                                if let CopilotServer::Started {
+                                    server,
+                                    subscriptions_by_buffer_id,
+                                    ..
+                                } = &mut this.server
+                                {
+                                    server
+                                        .notify::<lsp::notification::DidCloseTextDocument>(
+                                            lsp::DidCloseTextDocumentParams {
+                                                text_document: lsp::TextDocumentIdentifier::new(
+                                                    uri.clone(),
+                                                ),
+                                            },
+                                        )
+                                        .log_err();
+                                    subscriptions_by_buffer_id.remove(&buffer_id);
+                                }
+                            })
+                        });
+
+                    server.clone()
+                } else {
+                    return Task::ready(Err(anyhow!("must sign in before using copilot")));
+                }
+            }
+        };
+
+        let settings = cx.global::<Settings>();
+        let position = position.to_point_utf16(&snapshot);
+        let language = snapshot.language_at(position);
+        let language_name = language.map(|language| language.name());
+        let language_name = language_name.as_deref();
+        let tab_size = settings.tab_size(language_name);
+        let hard_tabs = settings.hard_tabs(language_name);
+        let language_id = id_for_language(language);
+
+        let path;
+        let relative_path;
+        if let Some(file) = snapshot.file() {
+            if let Some(file) = file.as_local() {
+                path = file.abs_path(cx);
+            } else {
+                path = file.full_path(cx);
+            }
+            relative_path = file.path().to_path_buf();
+        } else {
+            path = PathBuf::new();
+            relative_path = PathBuf::new();
+        }
+
+        cx.background().spawn(async move {
+            let result = server
+                .request::<R>(request::GetCompletionsParams {
+                    doc: request::GetCompletionsDocument {
+                        source: snapshot.text(),
+                        tab_size: tab_size.into(),
+                        indent_size: 1,
+                        insert_spaces: !hard_tabs,
+                        uri,
+                        path: path.to_string_lossy().into(),
+                        relative_path: relative_path.to_string_lossy().into(),
+                        language_id,
+                        position: point_to_lsp(position),
+                        version: 0,
+                    },
+                })
+                .await?;
+            let completions = result
+                .completions
+                .into_iter()
+                .map(|completion| {
+                    let start = snapshot
+                        .clip_point_utf16(point_from_lsp(completion.range.start), Bias::Left);
+                    let end =
+                        snapshot.clip_point_utf16(point_from_lsp(completion.range.end), Bias::Left);
+                    Completion {
+                        range: snapshot.anchor_before(start)..snapshot.anchor_after(end),
+                        text: completion.text,
+                    }
+                })
+                .collect();
+            anyhow::Ok(completions)
+        })
+    }
+
+    pub fn status(&self) -> Status {
+        match &self.server {
+            CopilotServer::Starting { task } => Status::Starting { task: task.clone() },
+            CopilotServer::Disabled => Status::Disabled,
+            CopilotServer::Error(error) => Status::Error(error.clone()),
+            CopilotServer::Started { status, .. } => match status {
+                SignInStatus::Authorized { .. } => Status::Authorized,
+                SignInStatus::Unauthorized { .. } => Status::Unauthorized,
+                SignInStatus::SigningIn { prompt, .. } => Status::SigningIn {
+                    prompt: prompt.clone(),
+                },
+                SignInStatus::SignedOut => Status::SignedOut,
+            },
+        }
+    }
+
+    fn update_sign_in_status(
+        &mut self,
+        lsp_status: request::SignInStatus,
+        cx: &mut ModelContext<Self>,
+    ) {
+        if let CopilotServer::Started { status, .. } = &mut self.server {
+            *status = match lsp_status {
+                request::SignInStatus::Ok { .. }
+                | request::SignInStatus::MaybeOk { .. }
+                | request::SignInStatus::AlreadySignedIn { .. } => SignInStatus::Authorized,
+                request::SignInStatus::NotAuthorized { .. } => SignInStatus::Unauthorized,
+                request::SignInStatus::NotSignedIn => SignInStatus::SignedOut,
+            };
+            cx.notify();
+        }
+    }
+}
+
+fn id_for_language(language: Option<&Arc<Language>>) -> String {
+    let language_name = language.map(|language| language.name());
+    match language_name.as_deref() {
+        Some("Plain Text") => "plaintext".to_string(),
+        Some(language_name) => language_name.to_lowercase(),
+        None => "plaintext".to_string(),
+    }
+}
+
+async fn clear_copilot_dir() {
+    remove_matching(&paths::COPILOT_DIR, |_| true).await
+}
+
+async fn get_copilot_lsp(http: Arc<dyn HttpClient>) -> anyhow::Result<PathBuf> {
+    const SERVER_PATH: &'static str = "dist/agent.js";
+
+    ///Check for the latest copilot language server and download it if we haven't already
+    async fn fetch_latest(http: Arc<dyn HttpClient>) -> anyhow::Result<PathBuf> {
+        let release = latest_github_release("zed-industries/copilot", http.clone()).await?;
+
+        let version_dir = &*paths::COPILOT_DIR.join(format!("copilot-{}", release.name));
+
+        fs::create_dir_all(version_dir).await?;
+        let server_path = version_dir.join(SERVER_PATH);
+
+        if fs::metadata(&server_path).await.is_err() {
+            // Copilot LSP looks for this dist dir specifcially, so lets add it in.
+            let dist_dir = version_dir.join("dist");
+            fs::create_dir_all(dist_dir.as_path()).await?;
+
+            let url = &release
+                .assets
+                .get(0)
+                .context("Github release for copilot contained no assets")?
+                .browser_download_url;
+
+            let mut response = http
+                .get(&url, Default::default(), true)
+                .await
+                .map_err(|err| anyhow!("error downloading copilot release: {}", err))?;
+            let decompressed_bytes = GzipDecoder::new(BufReader::new(response.body_mut()));
+            let archive = Archive::new(decompressed_bytes);
+            archive.unpack(dist_dir).await?;
+
+            remove_matching(&paths::COPILOT_DIR, |entry| entry != version_dir).await;
+        }
+
+        Ok(server_path)
+    }
+
+    match fetch_latest(http).await {
+        ok @ Result::Ok(..) => ok,
+        e @ Err(..) => {
+            e.log_err();
+            // Fetch a cached binary, if it exists
+            (|| async move {
+                let mut last_version_dir = None;
+                let mut entries = fs::read_dir(paths::COPILOT_DIR.as_path()).await?;
+                while let Some(entry) = entries.next().await {
+                    let entry = entry?;
+                    if entry.file_type().await?.is_dir() {
+                        last_version_dir = Some(entry.path());
+                    }
+                }
+                let last_version_dir =
+                    last_version_dir.ok_or_else(|| anyhow!("no cached binary"))?;
+                let server_path = last_version_dir.join(SERVER_PATH);
+                if server_path.exists() {
+                    Ok(server_path)
+                } else {
+                    Err(anyhow!(
+                        "missing executable in directory {:?}",
+                        last_version_dir
+                    ))
+                }
+            })()
+            .await
+        }
+    }
+}
--- a/crates/copilot/src/request.rs
+++ b/crates/copilot/src/request.rs
@@ -0,0 +1,171 @@
+use serde::{Deserialize, Serialize};
+
+pub enum CheckStatus {}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct CheckStatusParams {
+    pub local_checks_only: bool,
+}
+
+impl lsp::request::Request for CheckStatus {
+    type Params = CheckStatusParams;
+    type Result = SignInStatus;
+    const METHOD: &'static str = "checkStatus";
+}
+
+pub enum SignInInitiate {}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct SignInInitiateParams {}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(tag = "status")]
+pub enum SignInInitiateResult {
+    AlreadySignedIn { user: String },
+    PromptUserDeviceFlow(PromptUserDeviceFlow),
+}
+
+#[derive(Clone, Debug, Eq, PartialEq, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct PromptUserDeviceFlow {
+    pub user_code: String,
+    pub verification_uri: String,
+}
+
+impl lsp::request::Request for SignInInitiate {
+    type Params = SignInInitiateParams;
+    type Result = SignInInitiateResult;
+    const METHOD: &'static str = "signInInitiate";
+}
+
+pub enum SignInConfirm {}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SignInConfirmParams {
+    pub user_code: String,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(tag = "status")]
+pub enum SignInStatus {
+    #[serde(rename = "OK")]
+    Ok {
+        user: String,
+    },
+    MaybeOk {
+        user: String,
+    },
+    AlreadySignedIn {
+        user: String,
+    },
+    NotAuthorized {
+        user: String,
+    },
+    NotSignedIn,
+}
+
+impl lsp::request::Request for SignInConfirm {
+    type Params = SignInConfirmParams;
+    type Result = SignInStatus;
+    const METHOD: &'static str = "signInConfirm";
+}
+
+pub enum SignOut {}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SignOutParams {}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct SignOutResult {}
+
+impl lsp::request::Request for SignOut {
+    type Params = SignOutParams;
+    type Result = SignOutResult;
+    const METHOD: &'static str = "signOut";
+}
+
+pub enum GetCompletions {}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct GetCompletionsParams {
+    pub doc: GetCompletionsDocument,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct GetCompletionsDocument {
+    pub source: String,
+    pub tab_size: u32,
+    pub indent_size: u32,
+    pub insert_spaces: bool,
+    pub uri: lsp::Url,
+    pub path: String,
+    pub relative_path: String,
+    pub language_id: String,
+    pub position: lsp::Position,
+    pub version: usize,
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct GetCompletionsResult {
+    pub completions: Vec<Completion>,
+}
+
+#[derive(Clone, Debug, Default, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct Completion {
+    pub text: String,
+    pub position: lsp::Position,
+    pub uuid: String,
+    pub range: lsp::Range,
+    pub display_text: String,
+}
+
+impl lsp::request::Request for GetCompletions {
+    type Params = GetCompletionsParams;
+    type Result = GetCompletionsResult;
+    const METHOD: &'static str = "getCompletions";
+}
+
+pub enum GetCompletionsCycling {}
+
+impl lsp::request::Request for GetCompletionsCycling {
+    type Params = GetCompletionsParams;
+    type Result = GetCompletionsResult;
+    const METHOD: &'static str = "getCompletionsCycling";
+}
+
+pub enum LogMessage {}
+
+#[derive(Debug, Serialize, Deserialize)]
+#[serde(rename_all = "camelCase")]
+pub struct LogMessageParams {
+    pub message: String,
+    pub level: u8,
+    pub metadata_str: String,
+    pub extra: Vec<String>,
+}
+
+impl lsp::notification::Notification for LogMessage {
+    type Params = LogMessageParams;
+    const METHOD: &'static str = "LogMessage";
+}
+
+pub enum StatusNotification {}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct StatusNotificationParams {
+    pub message: String,
+    pub status: String, // One of Normal/InProgress
+}
+
+impl lsp::notification::Notification for StatusNotification {
+    type Params = StatusNotificationParams;
+    const METHOD: &'static str = "statusNotification";
+}
--- a/crates/copilot/src/sign_in.rs
+++ b/crates/copilot/src/sign_in.rs
@@ -0,0 +1,356 @@
+use crate::{request::PromptUserDeviceFlow, Copilot, Status};
+use gpui::{
+    elements::*,
+    geometry::rect::RectF,
+    platform::{WindowBounds, WindowKind, WindowOptions},
+    AppContext, ClipboardItem, Element, Entity, View, ViewContext, ViewHandle,
+};
+use settings::Settings;
+use theme::ui::modal;
+
+#[derive(PartialEq, Eq, Debug, Clone)]
+struct CopyUserCode;
+
+#[derive(PartialEq, Eq, Debug, Clone)]
+struct OpenGithub;
+
+const COPILOT_SIGN_UP_URL: &'static str = "https://github.com/features/copilot";
+
+pub fn init(cx: &mut AppContext) {
+    let copilot = Copilot::global(cx).unwrap();
+
+    let mut code_verification: Option<ViewHandle<CopilotCodeVerification>> = None;
+    cx.observe(&copilot, move |copilot, cx| {
+        let status = copilot.read(cx).status();
+
+        match &status {
+            crate::Status::SigningIn { prompt } => {
+                if let Some(code_verification_handle) = code_verification.as_mut() {
+                    if cx.has_window(code_verification_handle.window_id()) {
+                        code_verification_handle.update(cx, |code_verification_view, cx| {
+                            code_verification_view.set_status(status, cx)
+                        });
+                        cx.activate_window(code_verification_handle.window_id());
+                    } else {
+                        create_copilot_auth_window(cx, &status, &mut code_verification);
+                    }
+                } else if let Some(_prompt) = prompt {
+                    create_copilot_auth_window(cx, &status, &mut code_verification);
+                }
+            }
+            Status::Authorized | Status::Unauthorized => {
+                if let Some(code_verification) = code_verification.as_ref() {
+                    code_verification.update(cx, |code_verification, cx| {
+                        code_verification.set_status(status, cx)
+                    });
+
+                    cx.platform().activate(true);
+                    cx.activate_window(code_verification.window_id());
+                }
+            }
+            _ => {
+                if let Some(code_verification) = code_verification.take() {
+                    cx.remove_window(code_verification.window_id());
+                }
+            }
+        }
+    })
+    .detach();
+}
+
+fn create_copilot_auth_window(
+    cx: &mut AppContext,
+    status: &Status,
+    code_verification: &mut Option<ViewHandle<CopilotCodeVerification>>,
+) {
+    let window_size = cx.global::<Settings>().theme.copilot.modal.dimensions();
+    let window_options = WindowOptions {
+        bounds: WindowBounds::Fixed(RectF::new(Default::default(), window_size)),
+        titlebar: None,
+        center: true,
+        focus: true,
+        kind: WindowKind::Normal,
+        is_movable: true,
+        screen: None,
+    };
+    let (_, view) = cx.add_window(window_options, |_cx| {
+        CopilotCodeVerification::new(status.clone())
+    });
+    *code_verification = Some(view);
+}
+
+pub struct CopilotCodeVerification {
+    status: Status,
+}
+
+impl CopilotCodeVerification {
+    pub fn new(status: Status) -> Self {
+        Self { status }
+    }
+
+    pub fn set_status(&mut self, status: Status, cx: &mut ViewContext<Self>) {
+        self.status = status;
+        cx.notify();
+    }
+
+    fn render_device_code(
+        data: &PromptUserDeviceFlow,
+        style: &theme::Copilot,
+        cx: &mut gpui::RenderContext<Self>,
+    ) -> ElementBox {
+        let copied = cx
+            .read_from_clipboard()
+            .map(|item| item.text() == &data.user_code)
+            .unwrap_or(false);
+
+        let device_code_style = &style.auth.prompting.device_code;
+
+        MouseEventHandler::<Self>::new(0, cx, |state, _cx| {
+            Flex::row()
+                .with_children([
+                    Label::new(data.user_code.clone(), device_code_style.text.clone())
+                        .aligned()
+                        .contained()
+                        .with_style(device_code_style.left_container)
+                        .constrained()
+                        .with_width(device_code_style.left)
+                        .boxed(),
+                    Label::new(
+                        if copied { "Copied!" } else { "Copy" },
+                        device_code_style.cta.style_for(state, false).text.clone(),
+                    )
+                    .aligned()
+                    .contained()
+                    .with_style(*device_code_style.right_container.style_for(state, false))
+                    .constrained()
+                    .with_width(device_code_style.right)
+                    .boxed(),
+                ])
+                .contained()
+                .with_style(device_code_style.cta.style_for(state, false).container)
+                .boxed()
+        })
+        .on_click(gpui::platform::MouseButton::Left, {
+            let user_code = data.user_code.clone();
+            move |_, cx| {
+                cx.platform()
+                    .write_to_clipboard(ClipboardItem::new(user_code.clone()));
+                cx.notify();
+            }
+        })
+        .with_cursor_style(gpui::platform::CursorStyle::PointingHand)
+        .boxed()
+    }
+
+    fn render_prompting_modal(
+        data: &PromptUserDeviceFlow,
+        style: &theme::Copilot,
+        cx: &mut gpui::RenderContext<Self>,
+    ) -> ElementBox {
+        Flex::column()
+            .with_children([
+                Flex::column()
+                    .with_children([
+                        Label::new(
+                            "Enable Copilot by connecting",
+                            style.auth.prompting.subheading.text.clone(),
+                        )
+                        .aligned()
+                        .boxed(),
+                        Label::new(
+                            "your existing license.",
+                            style.auth.prompting.subheading.text.clone(),
+                        )
+                        .aligned()
+                        .boxed(),
+                    ])
+                    .align_children_center()
+                    .contained()
+                    .with_style(style.auth.prompting.subheading.container)
+                    .boxed(),
+                Self::render_device_code(data, &style, cx),
+                Flex::column()
+                    .with_children([
+                        Label::new(
+                            "Paste this code into GitHub after",
+                            style.auth.prompting.hint.text.clone(),
+                        )
+                        .aligned()
+                        .boxed(),
+                        Label::new(
+                            "clicking the button below.",
+                            style.auth.prompting.hint.text.clone(),
+                        )
+                        .aligned()
+                        .boxed(),
+                    ])
+                    .align_children_center()
+                    .contained()
+                    .with_style(style.auth.prompting.hint.container.clone())
+                    .boxed(),
+                theme::ui::cta_button_with_click(
+                    "Connect to GitHub",
+                    style.auth.content_width,
+                    &style.auth.cta_button,
+                    cx,
+                    {
+                        let verification_uri = data.verification_uri.clone();
+                        move |_, cx| cx.platform().open_url(&verification_uri)
+                    },
+                )
+                .boxed(),
+            ])
+            .align_children_center()
+            .boxed()
+    }
+    fn render_enabled_modal(
+        style: &theme::Copilot,
+        cx: &mut gpui::RenderContext<Self>,
+    ) -> ElementBox {
+        let enabled_style = &style.auth.authorized;
+        Flex::column()
+            .with_children([
+                Label::new("Copilot Enabled!", enabled_style.subheading.text.clone())
+                    .contained()
+                    .with_style(enabled_style.subheading.container)
+                    .aligned()
+                    .boxed(),
+                Flex::column()
+                    .with_children([
+                        Label::new(
+                            "You can update your settings or",
+                            enabled_style.hint.text.clone(),
+                        )
+                        .aligned()
+                        .boxed(),
+                        Label::new(
+                            "sign out from the Copilot menu in",
+                            enabled_style.hint.text.clone(),
+                        )
+                        .aligned()
+                        .boxed(),
+                        Label::new("the status bar.", enabled_style.hint.text.clone())
+                            .aligned()
+                            .boxed(),
+                    ])
+                    .align_children_center()
+                    .contained()
+                    .with_style(enabled_style.hint.container)
+                    .boxed(),
+                theme::ui::cta_button_with_click(
+                    "Done",
+                    style.auth.content_width,
+                    &style.auth.cta_button,
+                    cx,
+                    |_, cx| {
+                        let window_id = cx.window_id();
+                        cx.remove_window(window_id)
+                    },
+                )
+                .boxed(),
+            ])
+            .align_children_center()
+            .boxed()
+    }
+    fn render_unauthorized_modal(
+        style: &theme::Copilot,
+        cx: &mut gpui::RenderContext<Self>,
+    ) -> ElementBox {
+        let unauthorized_style = &style.auth.not_authorized;
+
+        Flex::column()
+            .with_children([
+                Flex::column()
+                    .with_children([
+                        Label::new(
+                            "Enable Copilot by connecting",
+                            unauthorized_style.subheading.text.clone(),
+                        )
+                        .aligned()
+                        .boxed(),
+                        Label::new(
+                            "your existing license.",
+                            unauthorized_style.subheading.text.clone(),
+                        )
+                        .aligned()
+                        .boxed(),
+                    ])
+                    .align_children_center()
+                    .contained()
+                    .with_style(unauthorized_style.subheading.container)
+                    .boxed(),
+                Flex::column()
+                    .with_children([
+                        Label::new(
+                            "You must have an active copilot",
+                            unauthorized_style.warning.text.clone(),
+                        )
+                        .aligned()
+                        .boxed(),
+                        Label::new(
+                            "license to use it in Zed.",
+                            unauthorized_style.warning.text.clone(),
+                        )
+                        .aligned()
+                        .boxed(),
+                    ])
+                    .align_children_center()
+                    .contained()
+                    .with_style(unauthorized_style.warning.container)
+                    .boxed(),
+                theme::ui::cta_button_with_click(
+                    "Subscribe on GitHub",
+                    style.auth.content_width,
+                    &style.auth.cta_button,
+                    cx,
+                    |_, cx| {
+                        let window_id = cx.window_id();
+                        cx.remove_window(window_id);
+                        cx.platform().open_url(COPILOT_SIGN_UP_URL)
+                    },
+                )
+                .boxed(),
+            ])
+            .align_children_center()
+            .boxed()
+    }
+}
+
+impl Entity for CopilotCodeVerification {
+    type Event = ();
+}
+
+impl View for CopilotCodeVerification {
+    fn ui_name() -> &'static str {
+        "CopilotCodeVerification"
+    }
+
+    fn focus_in(&mut self, _: gpui::AnyViewHandle, cx: &mut gpui::ViewContext<Self>) {
+        cx.notify()
+    }
+
+    fn focus_out(&mut self, _: gpui::AnyViewHandle, cx: &mut gpui::ViewContext<Self>) {
+        cx.notify()
+    }
+
+    fn render(&mut self, cx: &mut gpui::RenderContext<'_, Self>) -> gpui::ElementBox {
+        let style = cx.global::<Settings>().theme.clone();
+
+        modal("Connect Copilot to Zed", &style.copilot.modal, cx, |cx| {
+            Flex::column()
+                .with_children([
+                    theme::ui::icon(&style.copilot.auth.header).boxed(),
+                    match &self.status {
+                        Status::SigningIn {
+                            prompt: Some(prompt),
+                        } => Self::render_prompting_modal(&prompt, &style.copilot, cx),
+                        Status::Unauthorized => Self::render_unauthorized_modal(&style.copilot, cx),
+                        Status::Authorized => Self::render_enabled_modal(&style.copilot, cx),
+                        _ => Empty::new().boxed(),
+                    },
+                ])
+                .align_children_center()
+                .boxed()
+        })
+    }
+}
--- a/crates/copilot_button/Cargo.toml
+++ b/crates/copilot_button/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "copilot_button"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+path = "src/copilot_button.rs"
+doctest = false
+
+[dependencies]
+copilot = { path = "../copilot" }
+editor = { path = "../editor" }
+context_menu = { path = "../context_menu" }
+gpui = { path = "../gpui" }
+settings = { path = "../settings" }
+theme = { path = "../theme" }
+util = { path = "../util" }
+workspace = { path = "../workspace" }
+anyhow = "1.0"
+smol = "1.2.5"
+futures = "0.3"
--- a/crates/copilot_button/src/copilot_button.rs
+++ b/crates/copilot_button/src/copilot_button.rs
@@ -0,0 +1,341 @@
+use std::sync::Arc;
+
+use context_menu::{ContextMenu, ContextMenuItem};
+use editor::Editor;
+use gpui::{
+    elements::*,
+    impl_internal_actions,
+    platform::{CursorStyle, MouseButton},
+    AppContext, Element, ElementBox, Entity, MouseState, RenderContext, Subscription, View,
+    ViewContext, ViewHandle,
+};
+use settings::{settings_file::SettingsFile, Settings};
+use workspace::{
+    item::ItemHandle, notifications::simple_message_notification::OsOpen, DismissToast,
+    StatusItemView,
+};
+
+use copilot::{Copilot, Reinstall, SignIn, SignOut, Status};
+
+const COPILOT_SETTINGS_URL: &str = "https://github.com/settings/copilot";
+const COPILOT_STARTING_TOAST_ID: usize = 1337;
+const COPILOT_ERROR_TOAST_ID: usize = 1338;
+
+#[derive(Clone, PartialEq)]
+pub struct DeployCopilotMenu;
+
+#[derive(Clone, PartialEq)]
+pub struct ToggleCopilotForLanguage {
+    language: Arc<str>,
+}
+
+#[derive(Clone, PartialEq)]
+pub struct ToggleCopilotGlobally;
+
+// TODO: Make the other code path use `get_or_insert` logic for this modal
+#[derive(Clone, PartialEq)]
+pub struct DeployCopilotModal;
+
+impl_internal_actions!(
+    copilot,
+    [
+        DeployCopilotMenu,
+        DeployCopilotModal,
+        ToggleCopilotForLanguage,
+        ToggleCopilotGlobally,
+    ]
+);
+
+pub fn init(cx: &mut AppContext) {
+    cx.add_action(CopilotButton::deploy_copilot_menu);
+    cx.add_action(
+        |_: &mut CopilotButton, action: &ToggleCopilotForLanguage, cx| {
+            let language = action.language.to_owned();
+
+            let current_langauge = cx.global::<Settings>().copilot_on(Some(&language));
+
+            SettingsFile::update(cx, move |file_contents| {
+                file_contents.languages.insert(
+                    language.to_owned(),
+                    settings::EditorSettings {
+                        copilot: Some((!current_langauge).into()),
+                        ..Default::default()
+                    },
+                );
+            })
+        },
+    );
+
+    cx.add_action(|_: &mut CopilotButton, _: &ToggleCopilotGlobally, cx| {
+        let copilot_on = cx.global::<Settings>().copilot_on(None);
+
+        SettingsFile::update(cx, move |file_contents| {
+            file_contents.editor.copilot = Some((!copilot_on).into())
+        })
+    });
+}
+
+pub struct CopilotButton {
+    popup_menu: ViewHandle<ContextMenu>,
+    editor_subscription: Option<(Subscription, usize)>,
+    editor_enabled: Option<bool>,
+    language: Option<Arc<str>>,
+}
+
+impl Entity for CopilotButton {
+    type Event = ();
+}
+
+impl View for CopilotButton {
+    fn ui_name() -> &'static str {
+        "CopilotButton"
+    }
+
+    fn render(&mut self, cx: &mut RenderContext<'_, Self>) -> ElementBox {
+        let settings = cx.global::<Settings>();
+
+        if !settings.enable_copilot_integration {
+            return Empty::new().boxed();
+        }
+
+        let theme = settings.theme.clone();
+        let active = self.popup_menu.read(cx).visible();
+        let Some(copilot) = Copilot::global(cx) else {
+            return Empty::new().boxed();
+        };
+        let status = copilot.read(cx).status();
+
+        let enabled = self.editor_enabled.unwrap_or(settings.copilot_on(None));
+
+        let view_id = cx.view_id();
+
+        Stack::new()
+            .with_child(
+                MouseEventHandler::<Self>::new(0, cx, {
+                    let theme = theme.clone();
+                    let status = status.clone();
+                    move |state, _cx| {
+                        let style = theme
+                            .workspace
+                            .status_bar
+                            .sidebar_buttons
+                            .item
+                            .style_for(state, active);
+
+                        Flex::row()
+                            .with_child(
+                                Svg::new({
+                                    match status {
+                                        Status::Error(_) => "icons/copilot_error_16.svg",
+                                        Status::Authorized => {
+                                            if enabled {
+                                                "icons/copilot_16.svg"
+                                            } else {
+                                                "icons/copilot_disabled_16.svg"
+                                            }
+                                        }
+                                        _ => "icons/copilot_init_16.svg",
+                                    }
+                                })
+                                .with_color(style.icon_color)
+                                .constrained()
+                                .with_width(style.icon_size)
+                                .aligned()
+                                .named("copilot-icon"),
+                            )
+                            .constrained()
+                            .with_height(style.icon_size)
+                            .contained()
+                            .with_style(style.container)
+                            .boxed()
+                    }
+                })
+                .with_cursor_style(CursorStyle::PointingHand)
+                .on_click(MouseButton::Left, {
+                    let status = status.clone();
+                    move |_, cx| match status {
+                        Status::Authorized => cx.dispatch_action(DeployCopilotMenu),
+                        Status::Starting { ref task } => {
+                            cx.dispatch_action(workspace::Toast::new(
+                                COPILOT_STARTING_TOAST_ID,
+                                "Copilot is starting...",
+                            ));
+                            let window_id = cx.window_id();
+                            let task = task.to_owned();
+                            cx.spawn(|mut cx| async move {
+                                task.await;
+                                cx.update(|cx| {
+                                    if let Some(copilot) = Copilot::global(cx) {
+                                        let status = copilot.read(cx).status();
+                                        match status {
+                                            Status::Authorized => cx.dispatch_action_at(
+                                                window_id,
+                                                view_id,
+                                                workspace::Toast::new(
+                                                    COPILOT_STARTING_TOAST_ID,
+                                                    "Copilot has started!",
+                                                ),
+                                            ),
+                                            _ => {
+                                                cx.dispatch_action_at(
+                                                    window_id,
+                                                    view_id,
+                                                    DismissToast::new(COPILOT_STARTING_TOAST_ID),
+                                                );
+                                                cx.dispatch_global_action(SignIn)
+                                            }
+                                        }
+                                    }
+                                })
+                            })
+                            .detach();
+                        }
+                        Status::Error(ref e) => cx.dispatch_action(workspace::Toast::new_action(
+                            COPILOT_ERROR_TOAST_ID,
+                            format!("Copilot can't be started: {}", e),
+                            "Reinstall Copilot",
+                            Reinstall,
+                        )),
+                        _ => cx.dispatch_action(SignIn),
+                    }
+                })
+                .with_tooltip::<Self, _>(
+                    0,
+                    "GitHub Copilot".into(),
+                    None,
+                    theme.tooltip.clone(),
+                    cx,
+                )
+                .boxed(),
+            )
+            .with_child(
+                ChildView::new(&self.popup_menu, cx)
+                    .aligned()
+                    .top()
+                    .right()
+                    .boxed(),
+            )
+            .boxed()
+    }
+}
+
+impl CopilotButton {
+    pub fn new(cx: &mut ViewContext<Self>) -> Self {
+        let menu = cx.add_view(|cx| {
+            let mut menu = ContextMenu::new(cx);
+            menu.set_position_mode(OverlayPositionMode::Local);
+            menu
+        });
+
+        cx.observe(&menu, |_, _, cx| cx.notify()).detach();
+
+        Copilot::global(cx).map(|copilot| cx.observe(&copilot, |_, _, cx| cx.notify()).detach());
+
+        cx.observe_global::<Settings, _>(move |_, cx| cx.notify())
+            .detach();
+
+        Self {
+            popup_menu: menu,
+            editor_subscription: None,
+            editor_enabled: None,
+            language: None,
+        }
+    }
+
+    pub fn deploy_copilot_menu(&mut self, _: &DeployCopilotMenu, cx: &mut ViewContext<Self>) {
+        let settings = cx.global::<Settings>();
+
+        let mut menu_options = Vec::with_capacity(6);
+
+        if let Some(language) = &self.language {
+            let language_enabled = settings.copilot_on(Some(language.as_ref()));
+
+            menu_options.push(ContextMenuItem::item(
+                format!(
+                    "{} Copilot for {}",
+                    if language_enabled {
+                        "Disable"
+                    } else {
+                        "Enable"
+                    },
+                    language
+                ),
+                ToggleCopilotForLanguage {
+                    language: language.to_owned(),
+                },
+            ));
+        }
+
+        let globally_enabled = cx.global::<Settings>().copilot_on(None);
+        menu_options.push(ContextMenuItem::item(
+            if globally_enabled {
+                "Disable Copilot Globally"
+            } else {
+                "Enable Copilot Globally"
+            },
+            ToggleCopilotGlobally,
+        ));
+
+        menu_options.push(ContextMenuItem::Separator);
+
+        let icon_style = settings.theme.copilot.out_link_icon.clone();
+        menu_options.push(ContextMenuItem::element_item(
+            Box::new(
+                move |state: &mut MouseState, style: &theme::ContextMenuItem| {
+                    Flex::row()
+                        .with_children([
+                            Label::new("Copilot Settings", style.label.clone()).boxed(),
+                            theme::ui::icon(icon_style.style_for(state, false)).boxed(),
+                        ])
+                        .align_children_center()
+                        .boxed()
+                },
+            ),
+            OsOpen::new(COPILOT_SETTINGS_URL),
+        ));
+
+        menu_options.push(ContextMenuItem::item("Sign Out", SignOut));
+
+        self.popup_menu.update(cx, |menu, cx| {
+            menu.show(
+                Default::default(),
+                AnchorCorner::BottomRight,
+                menu_options,
+                cx,
+            );
+        });
+    }
+
+    pub fn update_enabled(&mut self, editor: ViewHandle<Editor>, cx: &mut ViewContext<Self>) {
+        let editor = editor.read(cx);
+
+        let snapshot = editor.buffer().read(cx).snapshot(cx);
+        let settings = cx.global::<Settings>();
+        let suggestion_anchor = editor.selections.newest_anchor().start;
+
+        let language_name = snapshot
+            .language_at(suggestion_anchor)
+            .map(|language| language.name());
+
+        self.language = language_name.clone();
+
+        self.editor_enabled = Some(settings.copilot_on(language_name.as_deref()));
+
+        cx.notify()
+    }
+}
+
+impl StatusItemView for CopilotButton {
+    fn set_active_pane_item(&mut self, item: Option<&dyn ItemHandle>, cx: &mut ViewContext<Self>) {
+        if let Some(editor) = item.map(|item| item.act_as::<Editor>(cx)).flatten() {
+            self.editor_subscription =
+                Some((cx.observe(&editor, Self::update_enabled), editor.id()));
+            self.update_enabled(editor, cx);
+        } else {
+            self.language = None;
+            self.editor_subscription = None;
+            self.editor_enabled = None;
+        }
+        cx.notify();
+    }
+}
--- a/crates/db/Cargo.toml
+++ b/crates/db/Cargo.toml
@@ -23,7 +23,8 @@ async-trait = "0.1"
 lazy_static = "1.4.0"
 log = { version = "0.4.16", features = ["kv_unstable_serde"] }
 parking_lot = "0.11.1"
-serde = { version = "1.0", features = ["derive"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 smol = "1.2"

 [dev-dependencies]
--- a/crates/db/src/db.rs
+++ b/crates/db/src/db.rs
@@ -4,7 +4,7 @@ pub mod query;
 // Re-export
 pub use anyhow;
 use anyhow::Context;
-use gpui::MutableAppContext;
+use gpui::AppContext;
 pub use indoc::indoc;
 pub use lazy_static;
 use parking_lot::{Mutex, RwLock};
@@ -239,7 +239,7 @@ macro_rules! define_connection {
    };
 }

-pub fn write_and_log<F>(cx: &mut MutableAppContext, db_write: impl FnOnce() -> F + Send + 'static)
+pub fn write_and_log<F>(cx: &mut AppContext, db_write: impl FnOnce() -> F + Send + 'static)
 where
    F: Future<Output = anyhow::Result<()>> + Send,
 {
--- a/crates/diagnostics/Cargo.toml
+++ b/crates/diagnostics/Cargo.toml
@@ -20,7 +20,7 @@ settings = { path = "../settings" }
 theme = { path = "../theme" }
 util = { path = "../util" }
 workspace = { path = "../workspace" }
-postage = { version = "0.4", features = ["futures-traits"] }
+postage = { workspace = true }

 [dev-dependencies]
 unindent = "0.1"
@@ -29,4 +29,4 @@ editor = { path = "../editor", features = ["test-support"] }
 language = { path = "../language", features = ["test-support"] }
 gpui = { path = "../gpui", features = ["test-support"] }
 workspace = { path = "../workspace", features = ["test-support"] }
-serde_json = { version = "1", features = ["preserve_order"] }
+serde_json = { workspace = true }
--- a/crates/diagnostics/src/diagnostics.rs
+++ b/crates/diagnostics/src/diagnostics.rs
@@ -11,8 +11,8 @@ use editor::{
 };
 use gpui::{
    actions, elements::*, fonts::TextStyle, impl_internal_actions, serde_json, AnyViewHandle,
-    AppContext, Entity, ModelHandle, MutableAppContext, RenderContext, Task, View, ViewContext,
-    ViewHandle, WeakViewHandle,
+    AppContext, Entity, ModelHandle, RenderContext, Task, View, ViewContext, ViewHandle,
+    WeakViewHandle,
 };
 use language::{
    Anchor, Bias, Buffer, Diagnostic, DiagnosticEntry, DiagnosticSeverity, Point, Selection,
@@ -41,7 +41,7 @@ impl_internal_actions!(diagnostics, [Jump]);

 const CONTEXT_LINE_COUNT: u32 = 1;

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(ProjectDiagnosticsEditor::deploy);
    items::init(cx);
 }
@@ -602,16 +602,16 @@ impl Item for ProjectDiagnosticsEditor {
        ))
    }

-    fn act_as_type(
-        &self,
+    fn act_as_type<'a>(
+        &'a self,
        type_id: TypeId,
-        self_handle: &ViewHandle<Self>,
-        _: &AppContext,
-    ) -> Option<AnyViewHandle> {
+        self_handle: &'a ViewHandle<Self>,
+        _: &'a AppContext,
+    ) -> Option<&AnyViewHandle> {
        if type_id == TypeId::of::<Self>() {
-            Some(self_handle.into())
+            Some(self_handle)
        } else if type_id == TypeId::of::<Editor>() {
-            Some((&self.editor).into())
+            Some(&self.editor)
        } else {
            None
        }
@@ -1176,10 +1176,7 @@ mod tests {
        });
    }

-    fn editor_blocks(
-        editor: &ViewHandle<Editor>,
-        cx: &mut MutableAppContext,
-    ) -> Vec<(u32, String)> {
+    fn editor_blocks(editor: &ViewHandle<Editor>, cx: &mut AppContext) -> Vec<(u32, String)> {
        let mut presenter = cx.build_presenter(editor.id(), 0., Default::default());
        let mut cx = presenter.build_layout_context(Default::default(), false, cx);
        cx.render(editor, |editor, cx| {
--- a/crates/diagnostics/src/items.rs
+++ b/crates/diagnostics/src/items.rs
@@ -1,8 +1,10 @@
 use collections::HashSet;
 use editor::{Editor, GoToDiagnostic};
 use gpui::{
-    elements::*, platform::CursorStyle, serde_json, Entity, ModelHandle, MouseButton,
-    MutableAppContext, RenderContext, Subscription, View, ViewContext, ViewHandle, WeakViewHandle,
+    elements::*,
+    platform::{CursorStyle, MouseButton},
+    serde_json, AppContext, Entity, ModelHandle, RenderContext, Subscription, View, ViewContext,
+    ViewHandle, WeakViewHandle,
 };
 use language::Diagnostic;
 use project::Project;
@@ -17,7 +19,7 @@ pub struct DiagnosticIndicator {
    _observe_active_editor: Option<Subscription>,
 }

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(DiagnosticIndicator::go_to_next_diagnostic);
 }

--- a/crates/drag_and_drop/src/drag_and_drop.rs
+++ b/crates/drag_and_drop/src/drag_and_drop.rs
@@ -4,9 +4,9 @@ use collections::HashSet;
 use gpui::{
    elements::{Empty, MouseEventHandler, Overlay},
    geometry::{rect::RectF, vector::Vector2F},
+    platform::{CursorStyle, MouseButton},
    scene::{MouseDown, MouseDrag},
-    CursorStyle, Element, ElementBox, EventContext, MouseButton, MutableAppContext, RenderContext,
-    View, WeakViewHandle,
+    AppContext, Element, ElementBox, EventContext, RenderContext, View, WeakViewHandle,
 };

 const DEAD_ZONE: f32 = 4.;
@@ -261,7 +261,7 @@ impl<V: View> DragAndDrop<V> {
            })
    }

-    pub fn cancel_dragging<P: Any>(&mut self, cx: &mut MutableAppContext) {
+    pub fn cancel_dragging<P: Any>(&mut self, cx: &mut AppContext) {
        if let Some(State::Dragging {
            payload, window_id, ..
        }) = &self.currently_dragged
@@ -274,13 +274,13 @@ impl<V: View> DragAndDrop<V> {
        }
    }

-    fn finish_dragging(&mut self, cx: &mut MutableAppContext) {
+    fn finish_dragging(&mut self, cx: &mut AppContext) {
        if let Some(State::Dragging { window_id, .. }) = self.currently_dragged.take() {
            self.notify_containers_for_window(window_id, cx);
        }
    }

-    fn notify_containers_for_window(&mut self, window_id: usize, cx: &mut MutableAppContext) {
+    fn notify_containers_for_window(&mut self, window_id: usize, cx: &mut AppContext) {
        self.containers.retain(|container| {
            if let Some(container) = container.upgrade(cx) {
                if container.window_id() == window_id {
--- a/crates/editor/Cargo.toml
+++ b/crates/editor/Cargo.toml
@@ -11,6 +11,7 @@ doctest = false
 [features]
 test-support = [
    "rand",
+    "copilot/test-support",
    "text/test-support",
    "language/test-support",
    "gpui/test-support",
@@ -22,10 +23,10 @@ test-support = [
 ]

 [dependencies]
-drag_and_drop = { path = "../drag_and_drop" }
-text = { path = "../text" }
 clock = { path = "../clock" }
+copilot = { path = "../copilot" }
 db = { path = "../db" }
+drag_and_drop = { path = "../drag_and_drop" }
 collections = { path = "../collections" }
 context_menu = { path = "../context_menu" }
 fuzzy = { path = "../fuzzy" }
@@ -38,10 +39,12 @@ rpc = { path = "../rpc" }
 settings = { path = "../settings" }
 snippet = { path = "../snippet" }
 sum_tree = { path = "../sum_tree" }
+text = { path = "../text" }
 theme = { path = "../theme" }
 util = { path = "../util" }
 sqlez = { path = "../sqlez" }
 workspace = { path = "../workspace" }
+
 aho-corasick = "0.7"
 anyhow = "1.0"
 futures = "0.3"
@@ -51,9 +54,10 @@ lazy_static = "1.4"
 log = { version = "0.4.16", features = ["kv_unstable_serde"] }
 ordered-float = "2.1.1"
 parking_lot = "0.11"
-postage = { version = "0.4", features = ["futures-traits"] }
+postage = { workspace = true }
 rand = { version = "0.8.3", optional = true }
 serde = { workspace = true }
+serde_derive = { workspace = true }
 smallvec = { version = "1.6", features = ["union"] }
 smol = "1.2"
 tree-sitter-rust = { version = "*", optional = true }
@@ -62,6 +66,7 @@ tree-sitter-javascript = { version = "*", optional = true }
 tree-sitter-typescript = { git = "https://github.com/tree-sitter/tree-sitter-typescript", rev = "5d20856f34315b068c41edaee2ac8a100081d259", optional = true }

 [dev-dependencies]
+copilot = { path = "../copilot", features = ["test-support"] }
 text = { path = "../text", features = ["test-support"] }
 language = { path = "../language", features = ["test-support"] }
 lsp = { path = "../lsp", features = ["test-support"] }
--- a/crates/editor/src/blink_manager.rs
+++ b/crates/editor/src/blink_manager.rs
@@ -15,12 +15,9 @@ pub struct BlinkManager {

 impl BlinkManager {
    pub fn new(blink_interval: Duration, cx: &mut ModelContext<Self>) -> Self {
-        let weak_handle = cx.weak_handle();
-        cx.observe_global::<Settings, _>(move |_, cx| {
-            if let Some(this) = weak_handle.upgrade(cx) {
-                // Make sure we blink the cursors if the setting is re-enabled
-                this.update(cx, |this, cx| this.blink_cursors(this.blink_epoch, cx));
-            }
+        cx.observe_global::<Settings, _>(move |this, cx| {
+            // Make sure we blink the cursors if the setting is re-enabled
+            this.blink_cursors(this.blink_epoch, cx)
        })
        .detach();

--- a/crates/editor/src/display_map.rs
+++ b/crates/editor/src/display_map.rs
@@ -1,12 +1,13 @@
 mod block_map;
 mod fold_map;
+mod suggestion_map;
 mod tab_map;
 mod wrap_map;

 use crate::{Anchor, AnchorRangeExt, MultiBuffer, MultiBufferSnapshot, ToOffset, ToPoint};
-use block_map::{BlockMap, BlockPoint};
+pub use block_map::{BlockMap, BlockPoint};
 use collections::{HashMap, HashSet};
-use fold_map::FoldMap;
+use fold_map::{FoldMap, FoldOffset};
 use gpui::{
    color::Color,
    fonts::{FontId, HighlightStyle},
@@ -15,6 +16,8 @@ use gpui::{
 use language::{OffsetUtf16, Point, Subscription as BufferSubscription};
 use settings::Settings;
 use std::{any::TypeId, fmt::Debug, num::NonZeroU32, ops::Range, sync::Arc};
+pub use suggestion_map::Suggestion;
+use suggestion_map::SuggestionMap;
 use sum_tree::{Bias, TreeMap};
 use tab_map::TabMap;
 use wrap_map::WrapMap;
@@ -40,6 +43,7 @@ pub struct DisplayMap {
    buffer: ModelHandle<MultiBuffer>,
    buffer_subscription: BufferSubscription,
    fold_map: FoldMap,
+    suggestion_map: SuggestionMap,
    tab_map: TabMap,
    wrap_map: ModelHandle<WrapMap>,
    block_map: BlockMap,
@@ -65,6 +69,7 @@ impl DisplayMap {

        let tab_size = Self::tab_size(&buffer, cx);
        let (fold_map, snapshot) = FoldMap::new(buffer.read(cx).snapshot(cx));
+        let (suggestion_map, snapshot) = SuggestionMap::new(snapshot);
        let (tab_map, snapshot) = TabMap::new(snapshot, tab_size);
        let (wrap_map, snapshot) = WrapMap::new(snapshot, font_id, font_size, wrap_width, cx);
        let block_map = BlockMap::new(snapshot, buffer_header_height, excerpt_header_height);
@@ -73,6 +78,7 @@ impl DisplayMap {
            buffer,
            buffer_subscription,
            fold_map,
+            suggestion_map,
            tab_map,
            wrap_map,
            block_map,
@@ -84,21 +90,25 @@ impl DisplayMap {
    pub fn snapshot(&self, cx: &mut ModelContext<Self>) -> DisplaySnapshot {
        let buffer_snapshot = self.buffer.read(cx).snapshot(cx);
        let edits = self.buffer_subscription.consume().into_inner();
-        let (folds_snapshot, edits) = self.fold_map.read(buffer_snapshot, edits);
+        let (fold_snapshot, edits) = self.fold_map.read(buffer_snapshot, edits);
+        let (suggestion_snapshot, edits) = self.suggestion_map.sync(fold_snapshot.clone(), edits);

        let tab_size = Self::tab_size(&self.buffer, cx);
-        let (tabs_snapshot, edits) = self.tab_map.sync(folds_snapshot.clone(), edits, tab_size);
-        let (wraps_snapshot, edits) = self
+        let (tab_snapshot, edits) = self
+            .tab_map
+            .sync(suggestion_snapshot.clone(), edits, tab_size);
+        let (wrap_snapshot, edits) = self
            .wrap_map
-            .update(cx, |map, cx| map.sync(tabs_snapshot.clone(), edits, cx));
-        let blocks_snapshot = self.block_map.read(wraps_snapshot.clone(), edits);
+            .update(cx, |map, cx| map.sync(tab_snapshot.clone(), edits, cx));
+        let block_snapshot = self.block_map.read(wrap_snapshot.clone(), edits);

        DisplaySnapshot {
            buffer_snapshot: self.buffer.read(cx).snapshot(cx),
-            folds_snapshot,
-            tabs_snapshot,
-            wraps_snapshot,
-            blocks_snapshot,
+            fold_snapshot,
+            suggestion_snapshot,
+            tab_snapshot,
+            wrap_snapshot,
+            block_snapshot,
            text_highlights: self.text_highlights.clone(),
            clip_at_line_ends: self.clip_at_line_ends,
        }
@@ -122,12 +132,14 @@ impl DisplayMap {
        let edits = self.buffer_subscription.consume().into_inner();
        let tab_size = Self::tab_size(&self.buffer, cx);
        let (mut fold_map, snapshot, edits) = self.fold_map.write(snapshot, edits);
+        let (snapshot, edits) = self.suggestion_map.sync(snapshot, edits);
        let (snapshot, edits) = self.tab_map.sync(snapshot, edits, tab_size);
        let (snapshot, edits) = self
            .wrap_map
            .update(cx, |map, cx| map.sync(snapshot, edits, cx));
        self.block_map.read(snapshot, edits);
        let (snapshot, edits) = fold_map.fold(ranges);
+        let (snapshot, edits) = self.suggestion_map.sync(snapshot, edits);
        let (snapshot, edits) = self.tab_map.sync(snapshot, edits, tab_size);
        let (snapshot, edits) = self
            .wrap_map
@@ -145,12 +157,14 @@ impl DisplayMap {
        let edits = self.buffer_subscription.consume().into_inner();
        let tab_size = Self::tab_size(&self.buffer, cx);
        let (mut fold_map, snapshot, edits) = self.fold_map.write(snapshot, edits);
+        let (snapshot, edits) = self.suggestion_map.sync(snapshot, edits);
        let (snapshot, edits) = self.tab_map.sync(snapshot, edits, tab_size);
        let (snapshot, edits) = self
            .wrap_map
            .update(cx, |map, cx| map.sync(snapshot, edits, cx));
        self.block_map.read(snapshot, edits);
        let (snapshot, edits) = fold_map.unfold(ranges, inclusive);
+        let (snapshot, edits) = self.suggestion_map.sync(snapshot, edits);
        let (snapshot, edits) = self.tab_map.sync(snapshot, edits, tab_size);
        let (snapshot, edits) = self
            .wrap_map
@@ -167,6 +181,7 @@ impl DisplayMap {
        let edits = self.buffer_subscription.consume().into_inner();
        let tab_size = Self::tab_size(&self.buffer, cx);
        let (snapshot, edits) = self.fold_map.read(snapshot, edits);
+        let (snapshot, edits) = self.suggestion_map.sync(snapshot, edits);
        let (snapshot, edits) = self.tab_map.sync(snapshot, edits, tab_size);
        let (snapshot, edits) = self
            .wrap_map
@@ -184,6 +199,7 @@ impl DisplayMap {
        let edits = self.buffer_subscription.consume().into_inner();
        let tab_size = Self::tab_size(&self.buffer, cx);
        let (snapshot, edits) = self.fold_map.read(snapshot, edits);
+        let (snapshot, edits) = self.suggestion_map.sync(snapshot, edits);
        let (snapshot, edits) = self.tab_map.sync(snapshot, edits, tab_size);
        let (snapshot, edits) = self
            .wrap_map
@@ -214,6 +230,32 @@ impl DisplayMap {
        self.text_highlights.remove(&Some(type_id))
    }

+    pub fn has_suggestion(&self) -> bool {
+        self.suggestion_map.has_suggestion()
+    }
+
+    pub fn replace_suggestion<T>(
+        &self,
+        new_suggestion: Option<Suggestion<T>>,
+        cx: &mut ModelContext<Self>,
+    ) -> Option<Suggestion<FoldOffset>>
+    where
+        T: ToPoint,
+    {
+        let snapshot = self.buffer.read(cx).snapshot(cx);
+        let edits = self.buffer_subscription.consume().into_inner();
+        let tab_size = Self::tab_size(&self.buffer, cx);
+        let (snapshot, edits) = self.fold_map.read(snapshot, edits);
+        let (snapshot, edits, old_suggestion) =
+            self.suggestion_map.replace(new_suggestion, snapshot, edits);
+        let (snapshot, edits) = self.tab_map.sync(snapshot, edits, tab_size);
+        let (snapshot, edits) = self
+            .wrap_map
+            .update(cx, |map, cx| map.sync(snapshot, edits, cx));
+        self.block_map.read(snapshot, edits);
+        old_suggestion
+    }
+
    pub fn set_font(&self, font_id: FontId, font_size: f32, cx: &mut ModelContext<Self>) -> bool {
        self.wrap_map
            .update(cx, |map, cx| map.set_font(font_id, font_size, cx))
@@ -246,10 +288,11 @@ impl DisplayMap {

 pub struct DisplaySnapshot {
    pub buffer_snapshot: MultiBufferSnapshot,
-    folds_snapshot: fold_map::FoldSnapshot,
-    tabs_snapshot: tab_map::TabSnapshot,
-    wraps_snapshot: wrap_map::WrapSnapshot,
-    blocks_snapshot: block_map::BlockSnapshot,
+    fold_snapshot: fold_map::FoldSnapshot,
+    suggestion_snapshot: suggestion_map::SuggestionSnapshot,
+    tab_snapshot: tab_map::TabSnapshot,
+    wrap_snapshot: wrap_map::WrapSnapshot,
+    block_snapshot: block_map::BlockSnapshot,
    text_highlights: TextHighlights,
    clip_at_line_ends: bool,
 }
@@ -257,7 +300,7 @@ pub struct DisplaySnapshot {
 impl DisplaySnapshot {
    #[cfg(test)]
    pub fn fold_count(&self) -> usize {
-        self.folds_snapshot.fold_count()
+        self.fold_snapshot.fold_count()
    }

    pub fn is_empty(&self) -> bool {
@@ -265,7 +308,7 @@ impl DisplaySnapshot {
    }

    pub fn buffer_rows(&self, start_row: u32) -> DisplayBufferRows {
-        self.blocks_snapshot.buffer_rows(start_row)
+        self.block_snapshot.buffer_rows(start_row)
    }

    pub fn max_buffer_row(&self) -> u32 {
@@ -274,9 +317,9 @@ impl DisplaySnapshot {

    pub fn prev_line_boundary(&self, mut point: Point) -> (Point, DisplayPoint) {
        loop {
-            let mut fold_point = self.folds_snapshot.to_fold_point(point, Bias::Left);
+            let mut fold_point = self.fold_snapshot.to_fold_point(point, Bias::Left);
            *fold_point.column_mut() = 0;
-            point = fold_point.to_buffer_point(&self.folds_snapshot);
+            point = fold_point.to_buffer_point(&self.fold_snapshot);

            let mut display_point = self.point_to_display_point(point, Bias::Left);
            *display_point.column_mut() = 0;
@@ -290,9 +333,9 @@ impl DisplaySnapshot {

    pub fn next_line_boundary(&self, mut point: Point) -> (Point, DisplayPoint) {
        loop {
-            let mut fold_point = self.folds_snapshot.to_fold_point(point, Bias::Right);
-            *fold_point.column_mut() = self.folds_snapshot.line_len(fold_point.row());
-            point = fold_point.to_buffer_point(&self.folds_snapshot);
+            let mut fold_point = self.fold_snapshot.to_fold_point(point, Bias::Right);
+            *fold_point.column_mut() = self.fold_snapshot.line_len(fold_point.row());
+            point = fold_point.to_buffer_point(&self.fold_snapshot);

            let mut display_point = self.point_to_display_point(point, Bias::Right);
            *display_point.column_mut() = self.line_len(display_point.row());
@@ -322,37 +365,39 @@ impl DisplaySnapshot {
    }

    fn point_to_display_point(&self, point: Point, bias: Bias) -> DisplayPoint {
-        let fold_point = self.folds_snapshot.to_fold_point(point, bias);
-        let tab_point = self.tabs_snapshot.to_tab_point(fold_point);
-        let wrap_point = self.wraps_snapshot.tab_point_to_wrap_point(tab_point);
-        let block_point = self.blocks_snapshot.to_block_point(wrap_point);
+        let fold_point = self.fold_snapshot.to_fold_point(point, bias);
+        let suggestion_point = self.suggestion_snapshot.to_suggestion_point(fold_point);
+        let tab_point = self.tab_snapshot.to_tab_point(suggestion_point);
+        let wrap_point = self.wrap_snapshot.tab_point_to_wrap_point(tab_point);
+        let block_point = self.block_snapshot.to_block_point(wrap_point);
        DisplayPoint(block_point)
    }

    fn display_point_to_point(&self, point: DisplayPoint, bias: Bias) -> Point {
        let block_point = point.0;
-        let wrap_point = self.blocks_snapshot.to_wrap_point(block_point);
-        let tab_point = self.wraps_snapshot.to_tab_point(wrap_point);
-        let fold_point = self.tabs_snapshot.to_fold_point(tab_point, bias).0;
-        fold_point.to_buffer_point(&self.folds_snapshot)
+        let wrap_point = self.block_snapshot.to_wrap_point(block_point);
+        let tab_point = self.wrap_snapshot.to_tab_point(wrap_point);
+        let suggestion_point = self.tab_snapshot.to_suggestion_point(tab_point, bias).0;
+        let fold_point = self.suggestion_snapshot.to_fold_point(suggestion_point);
+        fold_point.to_buffer_point(&self.fold_snapshot)
    }

    pub fn max_point(&self) -> DisplayPoint {
-        DisplayPoint(self.blocks_snapshot.max_point())
+        DisplayPoint(self.block_snapshot.max_point())
    }

    /// Returns text chunks starting at the given display row until the end of the file
    pub fn text_chunks(&self, display_row: u32) -> impl Iterator<Item = &str> {
-        self.blocks_snapshot
-            .chunks(display_row..self.max_point().row() + 1, false, None)
+        self.block_snapshot
+            .chunks(display_row..self.max_point().row() + 1, false, None, None)
            .map(|h| h.text)
    }

    /// Returns text chunks starting at the end of the given display row in reverse until the start of the file
    pub fn reverse_text_chunks(&self, display_row: u32) -> impl Iterator<Item = &str> {
        (0..=display_row).into_iter().rev().flat_map(|row| {
-            self.blocks_snapshot
-                .chunks(row..row + 1, false, None)
+            self.block_snapshot
+                .chunks(row..row + 1, false, None, None)
                .map(|h| h.text)
                .collect::<Vec<_>>()
                .into_iter()
@@ -360,16 +405,25 @@ impl DisplaySnapshot {
        })
    }

-    pub fn chunks(&self, display_rows: Range<u32>, language_aware: bool) -> DisplayChunks<'_> {
-        self.blocks_snapshot
-            .chunks(display_rows, language_aware, Some(&self.text_highlights))
+    pub fn chunks(
+        &self,
+        display_rows: Range<u32>,
+        language_aware: bool,
+        suggestion_highlight: Option<HighlightStyle>,
+    ) -> DisplayChunks<'_> {
+        self.block_snapshot.chunks(
+            display_rows,
+            language_aware,
+            Some(&self.text_highlights),
+            suggestion_highlight,
+        )
    }

    pub fn chars_at(
        &self,
        mut point: DisplayPoint,
    ) -> impl Iterator<Item = (char, DisplayPoint)> + '_ {
-        point = DisplayPoint(self.blocks_snapshot.clip_point(point.0, Bias::Left));
+        point = DisplayPoint(self.block_snapshot.clip_point(point.0, Bias::Left));
        self.text_chunks(point.row())
            .flat_map(str::chars)
            .skip_while({
@@ -396,7 +450,7 @@ impl DisplaySnapshot {
        &self,
        mut point: DisplayPoint,
    ) -> impl Iterator<Item = (char, DisplayPoint)> + '_ {
-        point = DisplayPoint(self.blocks_snapshot.clip_point(point.0, Bias::Left));
+        point = DisplayPoint(self.block_snapshot.clip_point(point.0, Bias::Left));
        self.reverse_text_chunks(point.row())
            .flat_map(|chunk| chunk.chars().rev())
            .skip_while({
@@ -510,7 +564,7 @@ impl DisplaySnapshot {
    }

    pub fn clip_point(&self, point: DisplayPoint, bias: Bias) -> DisplayPoint {
-        let mut clipped = self.blocks_snapshot.clip_point(point.0, bias);
+        let mut clipped = self.block_snapshot.clip_point(point.0, bias);
        if self.clip_at_line_ends {
            clipped = self.clip_at_line_end(DisplayPoint(clipped)).0
        }
@@ -521,7 +575,7 @@ impl DisplaySnapshot {
        let mut point = point.0;
        if point.column == self.line_len(point.row) {
            point.column = point.column.saturating_sub(1);
-            point = self.blocks_snapshot.clip_point(point, Bias::Left);
+            point = self.block_snapshot.clip_point(point, Bias::Left);
        }
        DisplayPoint(point)
    }
@@ -530,37 +584,34 @@ impl DisplaySnapshot {
    where
        T: ToOffset,
    {
-        self.folds_snapshot.folds_in_range(range)
+        self.fold_snapshot.folds_in_range(range)
    }

    pub fn blocks_in_range(
        &self,
        rows: Range<u32>,
    ) -> impl Iterator<Item = (u32, &TransformBlock)> {
-        self.blocks_snapshot.blocks_in_range(rows)
+        self.block_snapshot.blocks_in_range(rows)
    }

    pub fn intersects_fold<T: ToOffset>(&self, offset: T) -> bool {
-        self.folds_snapshot.intersects_fold(offset)
+        self.fold_snapshot.intersects_fold(offset)
    }

-    pub fn is_line_folded(&self, display_row: u32) -> bool {
-        let block_point = BlockPoint(Point::new(display_row, 0));
-        let wrap_point = self.blocks_snapshot.to_wrap_point(block_point);
-        let tab_point = self.wraps_snapshot.to_tab_point(wrap_point);
-        self.folds_snapshot.is_line_folded(tab_point.row())
+    pub fn is_line_folded(&self, buffer_row: u32) -> bool {
+        self.fold_snapshot.is_line_folded(buffer_row)
    }

    pub fn is_block_line(&self, display_row: u32) -> bool {
-        self.blocks_snapshot.is_block_line(display_row)
+        self.block_snapshot.is_block_line(display_row)
    }

    pub fn soft_wrap_indent(&self, display_row: u32) -> Option<u32> {
        let wrap_row = self
-            .blocks_snapshot
+            .block_snapshot
            .to_wrap_point(BlockPoint::new(display_row, 0))
            .row();
-        self.wraps_snapshot.soft_wrap_indent(wrap_row)
+        self.wrap_snapshot.soft_wrap_indent(wrap_row)
    }

    pub fn text(&self) -> String {
@@ -594,57 +645,84 @@ impl DisplaySnapshot {
        (indent, is_blank)
    }

+    pub fn line_indent_for_buffer_row(&self, buffer_row: u32) -> (u32, bool) {
+        let (buffer, range) = self
+            .buffer_snapshot
+            .buffer_line_for_row(buffer_row)
+            .unwrap();
+
+        let mut indent_size = 0;
+        let mut is_blank = false;
+        for c in buffer.chars_at(Point::new(range.start.row, 0)) {
+            if c == ' ' || c == '\t' {
+                indent_size += 1;
+            } else {
+                if c == '\n' {
+                    is_blank = true;
+                }
+                break;
+            }
+        }
+
+        (indent_size, is_blank)
+    }
+
    pub fn line_len(&self, row: u32) -> u32 {
-        self.blocks_snapshot.line_len(row)
+        self.block_snapshot.line_len(row)
    }

    pub fn longest_row(&self) -> u32 {
-        self.blocks_snapshot.longest_row()
+        self.block_snapshot.longest_row()
    }

-    pub fn fold_for_line(self: &Self, display_row: u32) -> Option<FoldStatus> {
-        if self.is_foldable(display_row) {
-            Some(FoldStatus::Foldable)
-        } else if self.is_line_folded(display_row) {
+    pub fn fold_for_line(self: &Self, buffer_row: u32) -> Option<FoldStatus> {
+        if self.is_line_folded(buffer_row) {
            Some(FoldStatus::Folded)
+        } else if self.is_foldable(buffer_row) {
+            Some(FoldStatus::Foldable)
        } else {
            None
        }
    }

-    pub fn is_foldable(self: &Self, row: u32) -> bool {
-        let max_point = self.max_point();
-        if row >= max_point.row() {
+    pub fn is_foldable(self: &Self, buffer_row: u32) -> bool {
+        let max_row = self.buffer_snapshot.max_buffer_row();
+        if buffer_row >= max_row {
            return false;
        }

-        let (start_indent, is_blank) = self.line_indent(row);
+        let (indent_size, is_blank) = self.line_indent_for_buffer_row(buffer_row);
        if is_blank {
            return false;
        }

-        for display_row in next_rows(row, self) {
-            let (indent, is_blank) = self.line_indent(display_row);
-            if !is_blank {
-                return indent > start_indent;
+        for next_row in (buffer_row + 1)..=max_row {
+            let (next_indent_size, next_line_is_blank) = self.line_indent_for_buffer_row(next_row);
+            if next_indent_size > indent_size {
+                return true;
+            } else if !next_line_is_blank {
+                break;
            }
        }

-        return false;
+        false
    }

-    pub fn foldable_range(self: &Self, row: u32) -> Option<Range<DisplayPoint>> {
-        let start = DisplayPoint::new(row, self.line_len(row));
-
-        if self.is_foldable(row) && !self.is_line_folded(start.row()) {
-            let (start_indent, _) = self.line_indent(row);
-            let max_point = self.max_point();
+    pub fn foldable_range(self: &Self, buffer_row: u32) -> Option<Range<Point>> {
+        let start = Point::new(buffer_row, self.buffer_snapshot.line_len(buffer_row));
+        if self.is_foldable(start.row) && !self.is_line_folded(start.row) {
+            let (start_indent, _) = self.line_indent_for_buffer_row(buffer_row);
+            let max_point = self.buffer_snapshot.max_point();
            let mut end = None;

-            for row in next_rows(row, self) {
-                let (indent, is_blank) = self.line_indent(row);
+            for row in (buffer_row + 1)..=max_point.row {
+                let (indent, is_blank) = self.line_indent_for_buffer_row(row);
                if !is_blank && indent <= start_indent {
-                    end = Some(DisplayPoint::new(row - 1, self.line_len(row - 1)));
+                    let prev_row = row - 1;
+                    end = Some(Point::new(
+                        prev_row,
+                        self.buffer_snapshot.line_len(prev_row),
+                    ));
                    break;
                }
            }
@@ -711,10 +789,11 @@ impl DisplayPoint {
    }

    pub fn to_offset(self, map: &DisplaySnapshot, bias: Bias) -> usize {
-        let unblocked_point = map.blocks_snapshot.to_wrap_point(self.0);
-        let unwrapped_point = map.wraps_snapshot.to_tab_point(unblocked_point);
-        let unexpanded_point = map.tabs_snapshot.to_fold_point(unwrapped_point, bias).0;
-        unexpanded_point.to_buffer_offset(&map.folds_snapshot)
+        let wrap_point = map.block_snapshot.to_wrap_point(self.0);
+        let tab_point = map.wrap_snapshot.to_tab_point(wrap_point);
+        let suggestion_point = map.tab_snapshot.to_suggestion_point(tab_point, bias).0;
+        let fold_point = map.suggestion_snapshot.to_fold_point(suggestion_point);
+        fold_point.to_buffer_offset(&map.fold_snapshot)
    }
 }

@@ -764,7 +843,7 @@ pub fn next_rows(display_row: u32, display_map: &DisplaySnapshot) -> impl Iterat
 pub mod tests {
    use super::*;
    use crate::{movement, test::marked_display_snapshot};
-    use gpui::{color::Color, elements::*, test::observe, MutableAppContext};
+    use gpui::{color::Color, elements::*, test::observe, AppContext};
    use language::{Buffer, Language, LanguageConfig, SelectionGoal};
    use rand::{prelude::*, Rng};
    use smol::stream::StreamExt;
@@ -785,7 +864,9 @@ pub mod tests {
        let mut tab_size = rng.gen_range(1..=4);
        let buffer_start_excerpt_header_height = rng.gen_range(1..=5);
        let excerpt_header_height = rng.gen_range(1..=5);
-        let family_id = font_cache.load_family(&["Helvetica"]).unwrap();
+        let family_id = font_cache
+            .load_family(&["Helvetica"], &Default::default())
+            .unwrap();
        let font_id = font_cache
            .select_font(family_id, &Default::default())
            .unwrap();
@@ -835,10 +916,10 @@ pub mod tests {

        let snapshot = map.update(cx, |map, cx| map.snapshot(cx));
        log::info!("buffer text: {:?}", snapshot.buffer_snapshot.text());
-        log::info!("fold text: {:?}", snapshot.folds_snapshot.text());
-        log::info!("tab text: {:?}", snapshot.tabs_snapshot.text());
-        log::info!("wrap text: {:?}", snapshot.wraps_snapshot.text());
-        log::info!("block text: {:?}", snapshot.blocks_snapshot.text());
+        log::info!("fold text: {:?}", snapshot.fold_snapshot.text());
+        log::info!("tab text: {:?}", snapshot.tab_snapshot.text());
+        log::info!("wrap text: {:?}", snapshot.wrap_snapshot.text());
+        log::info!("block text: {:?}", snapshot.block_snapshot.text());
        log::info!("display text: {:?}", snapshot.text());

        for _i in 0..operations {
@@ -943,10 +1024,10 @@ pub mod tests {
            let snapshot = map.update(cx, |map, cx| map.snapshot(cx));
            fold_count = snapshot.fold_count();
            log::info!("buffer text: {:?}", snapshot.buffer_snapshot.text());
-            log::info!("fold text: {:?}", snapshot.folds_snapshot.text());
-            log::info!("tab text: {:?}", snapshot.tabs_snapshot.text());
-            log::info!("wrap text: {:?}", snapshot.wraps_snapshot.text());
-            log::info!("block text: {:?}", snapshot.blocks_snapshot.text());
+            log::info!("fold text: {:?}", snapshot.fold_snapshot.text());
+            log::info!("tab text: {:?}", snapshot.tab_snapshot.text());
+            log::info!("wrap text: {:?}", snapshot.wrap_snapshot.text());
+            log::info!("block text: {:?}", snapshot.block_snapshot.text());
            log::info!("display text: {:?}", snapshot.text());

            // Line boundaries
@@ -1036,13 +1117,15 @@ pub mod tests {
    }

    #[gpui::test(retries = 5)]
-    fn test_soft_wraps(cx: &mut MutableAppContext) {
+    fn test_soft_wraps(cx: &mut AppContext) {
        cx.foreground().set_block_on_ticks(usize::MAX..=usize::MAX);
        cx.foreground().forbid_parking();

        let font_cache = cx.font_cache();

-        let family_id = font_cache.load_family(&["Helvetica"]).unwrap();
+        let family_id = font_cache
+            .load_family(&["Helvetica"], &Default::default())
+            .unwrap();
        let font_id = font_cache
            .select_font(family_id, &Default::default())
            .unwrap();
@@ -1127,11 +1210,14 @@ pub mod tests {
    }

    #[gpui::test]
-    fn test_text_chunks(cx: &mut gpui::MutableAppContext) {
+    fn test_text_chunks(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
        let text = sample_text(6, 6, 'a');
        let buffer = MultiBuffer::build_simple(&text, cx);
-        let family_id = cx.font_cache().load_family(&["Helvetica"]).unwrap();
+        let family_id = cx
+            .font_cache()
+            .load_family(&["Helvetica"], &Default::default())
+            .unwrap();
        let font_id = cx
            .font_cache()
            .select_font(family_id, &Default::default())
@@ -1214,7 +1300,9 @@ pub mod tests {
        let buffer = cx.add_model(|cx| MultiBuffer::singleton(buffer, cx));

        let font_cache = cx.font_cache();
-        let family_id = font_cache.load_family(&["Helvetica"]).unwrap();
+        let family_id = font_cache
+            .load_family(&["Helvetica"], &Default::default())
+            .unwrap();
        let font_id = font_cache
            .select_font(family_id, &Default::default())
            .unwrap();
@@ -1302,7 +1390,9 @@ pub mod tests {

        let font_cache = cx.font_cache();

-        let family_id = font_cache.load_family(&["Courier"]).unwrap();
+        let family_id = font_cache
+            .load_family(&["Courier"], &Default::default())
+            .unwrap();
        let font_id = font_cache
            .select_font(family_id, &Default::default())
            .unwrap();
@@ -1374,7 +1464,9 @@ pub mod tests {
        let buffer_snapshot = buffer.read_with(cx, |buffer, cx| buffer.snapshot(cx));

        let font_cache = cx.font_cache();
-        let family_id = font_cache.load_family(&["Courier"]).unwrap();
+        let family_id = font_cache
+            .load_family(&["Courier"], &Default::default())
+            .unwrap();
        let font_id = font_cache
            .select_font(family_id, &Default::default())
            .unwrap();
@@ -1417,9 +1509,9 @@ pub mod tests {
    }

    #[gpui::test]
-    fn test_clip_point(cx: &mut gpui::MutableAppContext) {
+    fn test_clip_point(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
-        fn assert(text: &str, shift_right: bool, bias: Bias, cx: &mut gpui::MutableAppContext) {
+        fn assert(text: &str, shift_right: bool, bias: Bias, cx: &mut gpui::AppContext) {
            let (unmarked_snapshot, mut markers) = marked_display_snapshot(text, cx);

            match bias {
@@ -1466,10 +1558,10 @@ pub mod tests {
    }

    #[gpui::test]
-    fn test_clip_at_line_ends(cx: &mut gpui::MutableAppContext) {
+    fn test_clip_at_line_ends(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));

-        fn assert(text: &str, cx: &mut gpui::MutableAppContext) {
+        fn assert(text: &str, cx: &mut gpui::AppContext) {
            let (mut unmarked_snapshot, markers) = marked_display_snapshot(text, cx);
            unmarked_snapshot.clip_at_line_ends = true;
            assert_eq!(
@@ -1485,12 +1577,14 @@ pub mod tests {
    }

    #[gpui::test]
-    fn test_tabs_with_multibyte_chars(cx: &mut gpui::MutableAppContext) {
+    fn test_tabs_with_multibyte_chars(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
        let text = "✅\t\tα\nβ\t\n🏀β\t\tγ";
        let buffer = MultiBuffer::build_simple(text, cx);
        let font_cache = cx.font_cache();
-        let family_id = font_cache.load_family(&["Helvetica"]).unwrap();
+        let family_id = font_cache
+            .load_family(&["Helvetica"], &Default::default())
+            .unwrap();
        let font_id = font_cache
            .select_font(family_id, &Default::default())
            .unwrap();
@@ -1544,11 +1638,13 @@ pub mod tests {
    }

    #[gpui::test]
-    fn test_max_point(cx: &mut gpui::MutableAppContext) {
+    fn test_max_point(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
        let buffer = MultiBuffer::build_simple("aaa\n\t\tbbb", cx);
        let font_cache = cx.font_cache();
-        let family_id = font_cache.load_family(&["Helvetica"]).unwrap();
+        let family_id = font_cache
+            .load_family(&["Helvetica"], &Default::default())
+            .unwrap();
        let font_id = font_cache
            .select_font(family_id, &Default::default())
            .unwrap();
@@ -1591,7 +1687,7 @@ pub mod tests {
        rows: Range<u32>,
        map: &ModelHandle<DisplayMap>,
        theme: &'a SyntaxTheme,
-        cx: &mut MutableAppContext,
+        cx: &mut AppContext,
    ) -> Vec<(String, Option<Color>)> {
        chunks(rows, map, theme, cx)
            .into_iter()
@@ -1603,11 +1699,11 @@ pub mod tests {
        rows: Range<u32>,
        map: &ModelHandle<DisplayMap>,
        theme: &'a SyntaxTheme,
-        cx: &mut MutableAppContext,
+        cx: &mut AppContext,
    ) -> Vec<(String, Option<Color>, Option<Color>)> {
        let snapshot = map.update(cx, |map, cx| map.snapshot(cx));
        let mut chunks: Vec<(String, Option<Color>, Option<Color>)> = Vec::new();
-        for chunk in snapshot.chunks(rows, true) {
+        for chunk in snapshot.chunks(rows, true, None) {
            let syntax_color = chunk
                .syntax_highlight_id
                .and_then(|id| id.style(theme)?.color);
--- a/crates/editor/src/display_map/block_map.rs
+++ b/crates/editor/src/display_map/block_map.rs
@@ -4,7 +4,7 @@ use super::{
 };
 use crate::{Anchor, ExcerptId, ExcerptRange, ToPoint as _};
 use collections::{Bound, HashMap, HashSet};
-use gpui::{ElementBox, RenderContext};
+use gpui::{fonts::HighlightStyle, ElementBox, RenderContext};
 use language::{BufferSnapshot, Chunk, Patch, Point};
 use parking_lot::Mutex;
 use std::{
@@ -572,7 +572,7 @@ impl<'a> BlockMapWriter<'a> {
 impl BlockSnapshot {
    #[cfg(test)]
    pub fn text(&self) -> String {
-        self.chunks(0..self.transforms.summary().output_rows, false, None)
+        self.chunks(0..self.transforms.summary().output_rows, false, None, None)
            .map(|chunk| chunk.text)
            .collect()
    }
@@ -582,6 +582,7 @@ impl BlockSnapshot {
        rows: Range<u32>,
        language_aware: bool,
        text_highlights: Option<&'a TextHighlights>,
+        suggestion_highlight: Option<HighlightStyle>,
    ) -> BlockChunks<'a> {
        let max_output_row = cmp::min(rows.end, self.transforms.summary().output_rows);
        let mut cursor = self.transforms.cursor::<(BlockRow, WrapRow)>();
@@ -614,6 +615,7 @@ impl BlockSnapshot {
                input_start..input_end,
                language_aware,
                text_highlights,
+                suggestion_highlight,
            ),
            input_chunk: Default::default(),
            transforms: cursor,
@@ -989,6 +991,7 @@ fn offset_for_row(s: &str, target: u32) -> (u32, usize) {
 #[cfg(test)]
 mod tests {
    use super::*;
+    use crate::display_map::suggestion_map::SuggestionMap;
    use crate::display_map::{fold_map::FoldMap, tab_map::TabMap, wrap_map::WrapMap};
    use crate::multi_buffer::MultiBuffer;
    use gpui::{elements::Empty, Element};
@@ -1012,10 +1015,13 @@ mod tests {
    }

    #[gpui::test]
-    fn test_basic_blocks(cx: &mut gpui::MutableAppContext) {
+    fn test_basic_blocks(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));

-        let family_id = cx.font_cache().load_family(&["Helvetica"]).unwrap();
+        let family_id = cx
+            .font_cache()
+            .load_family(&["Helvetica"], &Default::default())
+            .unwrap();
        let font_id = cx
            .font_cache()
            .select_font(family_id, &Default::default())
@@ -1026,9 +1032,10 @@ mod tests {
        let buffer = MultiBuffer::build_simple(text, cx);
        let buffer_snapshot = buffer.read(cx).snapshot(cx);
        let subscription = buffer.update(cx, |buffer, _| buffer.subscribe());
-        let (fold_map, folds_snapshot) = FoldMap::new(buffer_snapshot.clone());
-        let (tab_map, tabs_snapshot) = TabMap::new(folds_snapshot, 1.try_into().unwrap());
-        let (wrap_map, wraps_snapshot) = WrapMap::new(tabs_snapshot, font_id, 14.0, None, cx);
+        let (fold_map, fold_snapshot) = FoldMap::new(buffer_snapshot.clone());
+        let (suggestion_map, suggestion_snapshot) = SuggestionMap::new(fold_snapshot);
+        let (tab_map, tab_snapshot) = TabMap::new(suggestion_snapshot, 1.try_into().unwrap());
+        let (wrap_map, wraps_snapshot) = WrapMap::new(tab_snapshot, font_id, 14.0, None, cx);
        let mut block_map = BlockMap::new(wraps_snapshot.clone(), 1, 1);

        let mut writer = block_map.write(wraps_snapshot.clone(), Default::default());
@@ -1170,22 +1177,27 @@ mod tests {
            buffer.snapshot(cx)
        });

-        let (folds_snapshot, fold_edits) =
+        let (fold_snapshot, fold_edits) =
            fold_map.read(buffer_snapshot, subscription.consume().into_inner());
-        let (tabs_snapshot, tab_edits) =
-            tab_map.sync(folds_snapshot, fold_edits, 4.try_into().unwrap());
+        let (suggestion_snapshot, suggestion_edits) =
+            suggestion_map.sync(fold_snapshot, fold_edits);
+        let (tab_snapshot, tab_edits) =
+            tab_map.sync(suggestion_snapshot, suggestion_edits, 4.try_into().unwrap());
        let (wraps_snapshot, wrap_edits) = wrap_map.update(cx, |wrap_map, cx| {
-            wrap_map.sync(tabs_snapshot, tab_edits, cx)
+            wrap_map.sync(tab_snapshot, tab_edits, cx)
        });
        let snapshot = block_map.read(wraps_snapshot, wrap_edits);
        assert_eq!(snapshot.text(), "aaa\n\nb!!!\n\n\nbb\nccc\nddd\n\n\n");
    }

    #[gpui::test]
-    fn test_blocks_on_wrapped_lines(cx: &mut gpui::MutableAppContext) {
+    fn test_blocks_on_wrapped_lines(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));

-        let family_id = cx.font_cache().load_family(&["Helvetica"]).unwrap();
+        let family_id = cx
+            .font_cache()
+            .load_family(&["Helvetica"], &Default::default())
+            .unwrap();
        let font_id = cx
            .font_cache()
            .select_font(family_id, &Default::default())
@@ -1195,9 +1207,10 @@ mod tests {

        let buffer = MultiBuffer::build_simple(text, cx);
        let buffer_snapshot = buffer.read(cx).snapshot(cx);
-        let (_, folds_snapshot) = FoldMap::new(buffer_snapshot.clone());
-        let (_, tabs_snapshot) = TabMap::new(folds_snapshot, 1.try_into().unwrap());
-        let (_, wraps_snapshot) = WrapMap::new(tabs_snapshot, font_id, 14.0, Some(60.), cx);
+        let (_, fold_snapshot) = FoldMap::new(buffer_snapshot.clone());
+        let (_, suggestion_snapshot) = SuggestionMap::new(fold_snapshot);
+        let (_, tab_snapshot) = TabMap::new(suggestion_snapshot, 1.try_into().unwrap());
+        let (_, wraps_snapshot) = WrapMap::new(tab_snapshot, font_id, 14.0, Some(60.), cx);
        let mut block_map = BlockMap::new(wraps_snapshot.clone(), 1, 1);

        let mut writer = block_map.write(wraps_snapshot.clone(), Default::default());
@@ -1228,7 +1241,7 @@ mod tests {
    }

    #[gpui::test(iterations = 100)]
-    fn test_random_blocks(cx: &mut gpui::MutableAppContext, mut rng: StdRng) {
+    fn test_random_blocks(cx: &mut gpui::AppContext, mut rng: StdRng) {
        cx.set_global(Settings::test(cx));

        let operations = env::var("OPERATIONS")
@@ -1241,7 +1254,10 @@ mod tests {
            Some(rng.gen_range(0.0..=100.0))
        };
        let tab_size = 1.try_into().unwrap();
-        let family_id = cx.font_cache().load_family(&["Helvetica"]).unwrap();
+        let family_id = cx
+            .font_cache()
+            .load_family(&["Helvetica"], &Default::default())
+            .unwrap();
        let font_id = cx
            .font_cache()
            .select_font(family_id, &Default::default())
@@ -1263,10 +1279,11 @@ mod tests {
        };

        let mut buffer_snapshot = buffer.read(cx).snapshot(cx);
-        let (fold_map, folds_snapshot) = FoldMap::new(buffer_snapshot.clone());
-        let (tab_map, tabs_snapshot) = TabMap::new(folds_snapshot, tab_size);
+        let (fold_map, fold_snapshot) = FoldMap::new(buffer_snapshot.clone());
+        let (suggestion_map, suggestion_snapshot) = SuggestionMap::new(fold_snapshot);
+        let (tab_map, tab_snapshot) = TabMap::new(suggestion_snapshot, tab_size);
        let (wrap_map, wraps_snapshot) =
-            WrapMap::new(tabs_snapshot, font_id, font_size, wrap_width, cx);
+            WrapMap::new(tab_snapshot, font_id, font_size, wrap_width, cx);
        let mut block_map = BlockMap::new(
            wraps_snapshot,
            buffer_start_header_height,
@@ -1317,12 +1334,14 @@ mod tests {
                        })
                        .collect::<Vec<_>>();

-                    let (folds_snapshot, fold_edits) =
+                    let (fold_snapshot, fold_edits) =
                        fold_map.read(buffer_snapshot.clone(), vec![]);
-                    let (tabs_snapshot, tab_edits) =
-                        tab_map.sync(folds_snapshot, fold_edits, tab_size);
+                    let (suggestion_snapshot, suggestion_edits) =
+                        suggestion_map.sync(fold_snapshot, fold_edits);
+                    let (tab_snapshot, tab_edits) =
+                        tab_map.sync(suggestion_snapshot, suggestion_edits, tab_size);
                    let (wraps_snapshot, wrap_edits) = wrap_map.update(cx, |wrap_map, cx| {
-                        wrap_map.sync(tabs_snapshot, tab_edits, cx)
+                        wrap_map.sync(tab_snapshot, tab_edits, cx)
                    });
                    let mut block_map = block_map.write(wraps_snapshot, wrap_edits);
                    let block_ids = block_map.insert(block_properties.clone());
@@ -1340,12 +1359,14 @@ mod tests {
                        })
                        .collect();

-                    let (folds_snapshot, fold_edits) =
+                    let (fold_snapshot, fold_edits) =
                        fold_map.read(buffer_snapshot.clone(), vec![]);
-                    let (tabs_snapshot, tab_edits) =
-                        tab_map.sync(folds_snapshot, fold_edits, tab_size);
+                    let (suggestion_snapshot, suggestion_edits) =
+                        suggestion_map.sync(fold_snapshot, fold_edits);
+                    let (tab_snapshot, tab_edits) =
+                        tab_map.sync(suggestion_snapshot, suggestion_edits, tab_size);
                    let (wraps_snapshot, wrap_edits) = wrap_map.update(cx, |wrap_map, cx| {
-                        wrap_map.sync(tabs_snapshot, tab_edits, cx)
+                        wrap_map.sync(tab_snapshot, tab_edits, cx)
                    });
                    let mut block_map = block_map.write(wraps_snapshot, wrap_edits);
                    block_map.remove(block_ids_to_remove);
@@ -1362,10 +1383,13 @@ mod tests {
                }
            }

-            let (folds_snapshot, fold_edits) = fold_map.read(buffer_snapshot.clone(), buffer_edits);
-            let (tabs_snapshot, tab_edits) = tab_map.sync(folds_snapshot, fold_edits, tab_size);
+            let (fold_snapshot, fold_edits) = fold_map.read(buffer_snapshot.clone(), buffer_edits);
+            let (suggestion_snapshot, suggestion_edits) =
+                suggestion_map.sync(fold_snapshot, fold_edits);
+            let (tab_snapshot, tab_edits) =
+                tab_map.sync(suggestion_snapshot, suggestion_edits, tab_size);
            let (wraps_snapshot, wrap_edits) = wrap_map.update(cx, |wrap_map, cx| {
-                wrap_map.sync(tabs_snapshot, tab_edits, cx)
+                wrap_map.sync(tab_snapshot, tab_edits, cx)
            });
            let blocks_snapshot = block_map.read(wraps_snapshot.clone(), wrap_edits);
            assert_eq!(
@@ -1476,6 +1500,7 @@ mod tests {
                        start_row as u32..blocks_snapshot.max_point().row + 1,
                        false,
                        None,
+                        None,
                    )
                    .map(|chunk| chunk.text)
                    .collect::<String>();
--- a/crates/editor/src/display_map/fold_map.rs
+++ b/crates/editor/src/display_map/fold_map.rs
@@ -29,10 +29,6 @@ impl FoldPoint {
        self.0.row
    }

-    pub fn column(self) -> u32 {
-        self.0.column
-    }
-
    pub fn row_mut(&mut self) -> &mut u32 {
        &mut self.0.row
    }
@@ -639,14 +635,14 @@ impl FoldSnapshot {
        cursor.item().map_or(false, |t| t.output_text.is_some())
    }

-    pub fn is_line_folded(&self, output_row: u32) -> bool {
-        let mut cursor = self.transforms.cursor::<FoldPoint>();
-        cursor.seek(&FoldPoint::new(output_row, 0), Bias::Right, &());
+    pub fn is_line_folded(&self, buffer_row: u32) -> bool {
+        let mut cursor = self.transforms.cursor::<Point>();
+        cursor.seek(&Point::new(buffer_row, 0), Bias::Right, &());
        while let Some(transform) = cursor.item() {
            if transform.output_text.is_some() {
                return true;
            }
-            if cursor.end(&()).row() == output_row {
+            if cursor.end(&()).row == buffer_row {
                cursor.next(&())
            } else {
                break;
@@ -655,12 +651,6 @@ impl FoldSnapshot {
        false
    }

-    pub fn chars_at(&self, start: FoldPoint) -> impl '_ + Iterator<Item = char> {
-        let start = start.to_offset(self);
-        self.chunks(start..self.len(), false, None)
-            .flat_map(|chunk| chunk.text.chars())
-    }
-
    pub fn chunks<'a>(
        &'a self,
        range: Range<FoldOffset>,
@@ -1214,6 +1204,7 @@ pub type FoldEdit = Edit<FoldOffset>;
 mod tests {
    use super::*;
    use crate::{MultiBuffer, ToPoint};
+    use collections::HashSet;
    use rand::prelude::*;
    use settings::Settings;
    use std::{cmp::Reverse, env, mem, sync::Arc};
@@ -1223,7 +1214,7 @@ mod tests {
    use Bias::{Left, Right};

    #[gpui::test]
-    fn test_basic_folds(cx: &mut gpui::MutableAppContext) {
+    fn test_basic_folds(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
        let buffer = MultiBuffer::build_simple(&sample_text(5, 6, 'a'), cx);
        let subscription = buffer.update(cx, |buffer, _| buffer.subscribe());
@@ -1296,7 +1287,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_adjacent_folds(cx: &mut gpui::MutableAppContext) {
+    fn test_adjacent_folds(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
        let buffer = MultiBuffer::build_simple("abcdefghijkl", cx);
        let subscription = buffer.update(cx, |buffer, _| buffer.subscribe());
@@ -1343,7 +1334,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_overlapping_folds(cx: &mut gpui::MutableAppContext) {
+    fn test_overlapping_folds(cx: &mut gpui::AppContext) {
        let buffer = MultiBuffer::build_simple(&sample_text(5, 6, 'a'), cx);
        let buffer_snapshot = buffer.read(cx).snapshot(cx);
        let mut map = FoldMap::new(buffer_snapshot.clone()).0;
@@ -1359,7 +1350,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_merging_folds_via_edit(cx: &mut gpui::MutableAppContext) {
+    fn test_merging_folds_via_edit(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
        let buffer = MultiBuffer::build_simple(&sample_text(5, 6, 'a'), cx);
        let subscription = buffer.update(cx, |buffer, _| buffer.subscribe());
@@ -1383,7 +1374,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_folds_in_range(cx: &mut gpui::MutableAppContext) {
+    fn test_folds_in_range(cx: &mut gpui::AppContext) {
        let buffer = MultiBuffer::build_simple(&sample_text(5, 6, 'a'), cx);
        let buffer_snapshot = buffer.read(cx).snapshot(cx);
        let mut map = FoldMap::new(buffer_snapshot.clone()).0;
@@ -1410,7 +1401,7 @@ mod tests {
    }

    #[gpui::test(iterations = 100)]
-    fn test_random_folds(cx: &mut gpui::MutableAppContext, mut rng: StdRng) {
+    fn test_random_folds(cx: &mut gpui::AppContext, mut rng: StdRng) {
        cx.set_global(Settings::test(cx));
        let operations = env::var("OPERATIONS")
            .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
@@ -1593,10 +1584,13 @@ mod tests {
                fold_row += 1;
            }

-            for fold_range in map.merged_fold_ranges() {
-                let fold_point =
-                    snapshot.to_fold_point(fold_range.start.to_point(&buffer_snapshot), Right);
-                assert!(snapshot.is_line_folded(fold_point.row()));
+            let fold_start_rows = map
+                .merged_fold_ranges()
+                .iter()
+                .map(|range| range.start.to_point(&buffer_snapshot).row)
+                .collect::<HashSet<_>>();
+            for row in fold_start_rows {
+                assert!(snapshot.is_line_folded(row));
            }

            for _ in 0..5 {
@@ -1662,7 +1656,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_buffer_rows(cx: &mut gpui::MutableAppContext) {
+    fn test_buffer_rows(cx: &mut gpui::AppContext) {
        let text = sample_text(6, 6, 'a') + "\n";
        let buffer = MultiBuffer::build_simple(&text, cx);

--- a/crates/editor/src/display_map/suggestion_map.rs
+++ b/crates/editor/src/display_map/suggestion_map.rs
@@ -0,0 +1,867 @@
+use super::{
+    fold_map::{FoldBufferRows, FoldChunks, FoldEdit, FoldOffset, FoldPoint, FoldSnapshot},
+    TextHighlights,
+};
+use crate::{MultiBufferSnapshot, ToPoint};
+use gpui::fonts::HighlightStyle;
+use language::{Bias, Chunk, Edit, Patch, Point, Rope, TextSummary};
+use parking_lot::Mutex;
+use std::{
+    cmp,
+    ops::{Add, AddAssign, Range, Sub},
+};
+use util::post_inc;
+
+pub type SuggestionEdit = Edit<SuggestionOffset>;
+
+#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
+pub struct SuggestionOffset(pub usize);
+
+impl Add for SuggestionOffset {
+    type Output = Self;
+
+    fn add(self, rhs: Self) -> Self::Output {
+        Self(self.0 + rhs.0)
+    }
+}
+
+impl Sub for SuggestionOffset {
+    type Output = Self;
+
+    fn sub(self, rhs: Self) -> Self::Output {
+        Self(self.0 - rhs.0)
+    }
+}
+
+impl AddAssign for SuggestionOffset {
+    fn add_assign(&mut self, rhs: Self) {
+        self.0 += rhs.0;
+    }
+}
+
+#[derive(Copy, Clone, Debug, Default, Eq, Ord, PartialOrd, PartialEq)]
+pub struct SuggestionPoint(pub Point);
+
+impl SuggestionPoint {
+    pub fn new(row: u32, column: u32) -> Self {
+        Self(Point::new(row, column))
+    }
+
+    pub fn row(self) -> u32 {
+        self.0.row
+    }
+
+    pub fn column(self) -> u32 {
+        self.0.column
+    }
+}
+
+#[derive(Clone, Debug)]
+pub struct Suggestion<T> {
+    pub position: T,
+    pub text: Rope,
+}
+
+pub struct SuggestionMap(Mutex<SuggestionSnapshot>);
+
+impl SuggestionMap {
+    pub fn new(fold_snapshot: FoldSnapshot) -> (Self, SuggestionSnapshot) {
+        let snapshot = SuggestionSnapshot {
+            fold_snapshot,
+            suggestion: None,
+            version: 0,
+        };
+        (Self(Mutex::new(snapshot.clone())), snapshot)
+    }
+
+    pub fn replace<T>(
+        &self,
+        new_suggestion: Option<Suggestion<T>>,
+        fold_snapshot: FoldSnapshot,
+        fold_edits: Vec<FoldEdit>,
+    ) -> (
+        SuggestionSnapshot,
+        Vec<SuggestionEdit>,
+        Option<Suggestion<FoldOffset>>,
+    )
+    where
+        T: ToPoint,
+    {
+        let new_suggestion = new_suggestion.map(|new_suggestion| {
+            let buffer_point = new_suggestion
+                .position
+                .to_point(fold_snapshot.buffer_snapshot());
+            let fold_point = fold_snapshot.to_fold_point(buffer_point, Bias::Left);
+            let fold_offset = fold_point.to_offset(&fold_snapshot);
+            Suggestion {
+                position: fold_offset,
+                text: new_suggestion.text,
+            }
+        });
+
+        let (_, edits) = self.sync(fold_snapshot, fold_edits);
+        let mut snapshot = self.0.lock();
+
+        let mut patch = Patch::new(edits);
+        let old_suggestion = snapshot.suggestion.take();
+        if let Some(suggestion) = &old_suggestion {
+            patch = patch.compose([SuggestionEdit {
+                old: SuggestionOffset(suggestion.position.0)
+                    ..SuggestionOffset(suggestion.position.0 + suggestion.text.len()),
+                new: SuggestionOffset(suggestion.position.0)
+                    ..SuggestionOffset(suggestion.position.0),
+            }]);
+        }
+
+        if let Some(suggestion) = new_suggestion.as_ref() {
+            patch = patch.compose([SuggestionEdit {
+                old: SuggestionOffset(suggestion.position.0)
+                    ..SuggestionOffset(suggestion.position.0),
+                new: SuggestionOffset(suggestion.position.0)
+                    ..SuggestionOffset(suggestion.position.0 + suggestion.text.len()),
+            }]);
+        }
+
+        snapshot.suggestion = new_suggestion;
+        snapshot.version += 1;
+        (snapshot.clone(), patch.into_inner(), old_suggestion)
+    }
+
+    pub fn sync(
+        &self,
+        fold_snapshot: FoldSnapshot,
+        fold_edits: Vec<FoldEdit>,
+    ) -> (SuggestionSnapshot, Vec<SuggestionEdit>) {
+        let mut snapshot = self.0.lock();
+
+        if snapshot.fold_snapshot.version != fold_snapshot.version {
+            snapshot.version += 1;
+        }
+
+        let mut suggestion_edits = Vec::new();
+
+        let mut suggestion_old_len = 0;
+        let mut suggestion_new_len = 0;
+        for fold_edit in fold_edits {
+            let start = fold_edit.new.start;
+            let end = FoldOffset(start.0 + fold_edit.old_len().0);
+            if let Some(suggestion) = snapshot.suggestion.as_mut() {
+                if end <= suggestion.position {
+                    suggestion.position.0 += fold_edit.new_len().0;
+                    suggestion.position.0 -= fold_edit.old_len().0;
+                } else if start > suggestion.position {
+                    suggestion_old_len = suggestion.text.len();
+                    suggestion_new_len = suggestion_old_len;
+                } else {
+                    suggestion_old_len = suggestion.text.len();
+                    snapshot.suggestion.take();
+                    suggestion_edits.push(SuggestionEdit {
+                        old: SuggestionOffset(fold_edit.old.start.0)
+                            ..SuggestionOffset(fold_edit.old.end.0 + suggestion_old_len),
+                        new: SuggestionOffset(fold_edit.new.start.0)
+                            ..SuggestionOffset(fold_edit.new.end.0),
+                    });
+                    continue;
+                }
+            }
+
+            suggestion_edits.push(SuggestionEdit {
+                old: SuggestionOffset(fold_edit.old.start.0 + suggestion_old_len)
+                    ..SuggestionOffset(fold_edit.old.end.0 + suggestion_old_len),
+                new: SuggestionOffset(fold_edit.new.start.0 + suggestion_new_len)
+                    ..SuggestionOffset(fold_edit.new.end.0 + suggestion_new_len),
+            });
+        }
+        snapshot.fold_snapshot = fold_snapshot;
+
+        (snapshot.clone(), suggestion_edits)
+    }
+
+    pub fn has_suggestion(&self) -> bool {
+        let snapshot = self.0.lock();
+        snapshot.suggestion.is_some()
+    }
+}
+
+#[derive(Clone)]
+pub struct SuggestionSnapshot {
+    pub fold_snapshot: FoldSnapshot,
+    pub suggestion: Option<Suggestion<FoldOffset>>,
+    pub version: usize,
+}
+
+impl SuggestionSnapshot {
+    pub fn buffer_snapshot(&self) -> &MultiBufferSnapshot {
+        self.fold_snapshot.buffer_snapshot()
+    }
+
+    pub fn max_point(&self) -> SuggestionPoint {
+        if let Some(suggestion) = self.suggestion.as_ref() {
+            let suggestion_point = suggestion.position.to_point(&self.fold_snapshot);
+            let mut max_point = suggestion_point.0;
+            max_point += suggestion.text.max_point();
+            max_point += self.fold_snapshot.max_point().0 - suggestion_point.0;
+            SuggestionPoint(max_point)
+        } else {
+            SuggestionPoint(self.fold_snapshot.max_point().0)
+        }
+    }
+
+    pub fn len(&self) -> SuggestionOffset {
+        if let Some(suggestion) = self.suggestion.as_ref() {
+            let mut len = suggestion.position.0;
+            len += suggestion.text.len();
+            len += self.fold_snapshot.len().0 - suggestion.position.0;
+            SuggestionOffset(len)
+        } else {
+            SuggestionOffset(self.fold_snapshot.len().0)
+        }
+    }
+
+    pub fn line_len(&self, row: u32) -> u32 {
+        if let Some(suggestion) = &self.suggestion {
+            let suggestion_start = suggestion.position.to_point(&self.fold_snapshot).0;
+            let suggestion_end = suggestion_start + suggestion.text.max_point();
+
+            if row < suggestion_start.row {
+                self.fold_snapshot.line_len(row)
+            } else if row > suggestion_end.row {
+                self.fold_snapshot
+                    .line_len(suggestion_start.row + (row - suggestion_end.row))
+            } else {
+                let mut result = suggestion.text.line_len(row - suggestion_start.row);
+                if row == suggestion_start.row {
+                    result += suggestion_start.column;
+                }
+                if row == suggestion_end.row {
+                    result +=
+                        self.fold_snapshot.line_len(suggestion_start.row) - suggestion_start.column;
+                }
+                result
+            }
+        } else {
+            self.fold_snapshot.line_len(row)
+        }
+    }
+
+    pub fn clip_point(&self, point: SuggestionPoint, bias: Bias) -> SuggestionPoint {
+        if let Some(suggestion) = self.suggestion.as_ref() {
+            let suggestion_start = suggestion.position.to_point(&self.fold_snapshot).0;
+            let suggestion_end = suggestion_start + suggestion.text.max_point();
+            if point.0 <= suggestion_start {
+                SuggestionPoint(self.fold_snapshot.clip_point(FoldPoint(point.0), bias).0)
+            } else if point.0 > suggestion_end {
+                let fold_point = self.fold_snapshot.clip_point(
+                    FoldPoint(suggestion_start + (point.0 - suggestion_end)),
+                    bias,
+                );
+                let suggestion_point = suggestion_end + (fold_point.0 - suggestion_start);
+                if bias == Bias::Left && suggestion_point == suggestion_end {
+                    SuggestionPoint(suggestion_start)
+                } else {
+                    SuggestionPoint(suggestion_point)
+                }
+            } else if bias == Bias::Left || suggestion_start == self.fold_snapshot.max_point().0 {
+                SuggestionPoint(suggestion_start)
+            } else {
+                let fold_point = if self.fold_snapshot.line_len(suggestion_start.row)
+                    > suggestion_start.column
+                {
+                    FoldPoint(suggestion_start + Point::new(0, 1))
+                } else {
+                    FoldPoint(suggestion_start + Point::new(1, 0))
+                };
+                let clipped_fold_point = self.fold_snapshot.clip_point(fold_point, bias);
+                SuggestionPoint(suggestion_end + (clipped_fold_point.0 - suggestion_start))
+            }
+        } else {
+            SuggestionPoint(self.fold_snapshot.clip_point(FoldPoint(point.0), bias).0)
+        }
+    }
+
+    pub fn to_offset(&self, point: SuggestionPoint) -> SuggestionOffset {
+        if let Some(suggestion) = self.suggestion.as_ref() {
+            let suggestion_start = suggestion.position.to_point(&self.fold_snapshot).0;
+            let suggestion_end = suggestion_start + suggestion.text.max_point();
+
+            if point.0 <= suggestion_start {
+                SuggestionOffset(FoldPoint(point.0).to_offset(&self.fold_snapshot).0)
+            } else if point.0 > suggestion_end {
+                let fold_offset = FoldPoint(suggestion_start + (point.0 - suggestion_end))
+                    .to_offset(&self.fold_snapshot);
+                SuggestionOffset(fold_offset.0 + suggestion.text.len())
+            } else {
+                let offset_in_suggestion =
+                    suggestion.text.point_to_offset(point.0 - suggestion_start);
+                SuggestionOffset(suggestion.position.0 + offset_in_suggestion)
+            }
+        } else {
+            SuggestionOffset(FoldPoint(point.0).to_offset(&self.fold_snapshot).0)
+        }
+    }
+
+    pub fn to_point(&self, offset: SuggestionOffset) -> SuggestionPoint {
+        if let Some(suggestion) = self.suggestion.as_ref() {
+            let suggestion_point_start = suggestion.position.to_point(&self.fold_snapshot).0;
+            if offset.0 <= suggestion.position.0 {
+                SuggestionPoint(FoldOffset(offset.0).to_point(&self.fold_snapshot).0)
+            } else if offset.0 > (suggestion.position.0 + suggestion.text.len()) {
+                let fold_point = FoldOffset(offset.0 - suggestion.text.len())
+                    .to_point(&self.fold_snapshot)
+                    .0;
+
+                SuggestionPoint(
+                    suggestion_point_start
+                        + suggestion.text.max_point()
+                        + (fold_point - suggestion_point_start),
+                )
+            } else {
+                let point_in_suggestion = suggestion
+                    .text
+                    .offset_to_point(offset.0 - suggestion.position.0);
+                SuggestionPoint(suggestion_point_start + point_in_suggestion)
+            }
+        } else {
+            SuggestionPoint(FoldOffset(offset.0).to_point(&self.fold_snapshot).0)
+        }
+    }
+
+    pub fn to_fold_point(&self, point: SuggestionPoint) -> FoldPoint {
+        if let Some(suggestion) = self.suggestion.as_ref() {
+            let suggestion_start = suggestion.position.to_point(&self.fold_snapshot).0;
+            let suggestion_end = suggestion_start + suggestion.text.max_point();
+
+            if point.0 <= suggestion_start {
+                FoldPoint(point.0)
+            } else if point.0 > suggestion_end {
+                FoldPoint(suggestion_start + (point.0 - suggestion_end))
+            } else {
+                FoldPoint(suggestion_start)
+            }
+        } else {
+            FoldPoint(point.0)
+        }
+    }
+
+    pub fn to_suggestion_point(&self, point: FoldPoint) -> SuggestionPoint {
+        if let Some(suggestion) = self.suggestion.as_ref() {
+            let suggestion_start = suggestion.position.to_point(&self.fold_snapshot).0;
+
+            if point.0 <= suggestion_start {
+                SuggestionPoint(point.0)
+            } else {
+                let suggestion_end = suggestion_start + suggestion.text.max_point();
+                SuggestionPoint(suggestion_end + (point.0 - suggestion_start))
+            }
+        } else {
+            SuggestionPoint(point.0)
+        }
+    }
+
+    pub fn text_summary_for_range(&self, range: Range<SuggestionPoint>) -> TextSummary {
+        if let Some(suggestion) = self.suggestion.as_ref() {
+            let suggestion_start = suggestion.position.to_point(&self.fold_snapshot).0;
+            let suggestion_end = suggestion_start + suggestion.text.max_point();
+            let mut summary = TextSummary::default();
+
+            let prefix_range =
+                cmp::min(range.start.0, suggestion_start)..cmp::min(range.end.0, suggestion_start);
+            if prefix_range.start < prefix_range.end {
+                summary += self.fold_snapshot.text_summary_for_range(
+                    FoldPoint(prefix_range.start)..FoldPoint(prefix_range.end),
+                );
+            }
+
+            let suggestion_range =
+                cmp::max(range.start.0, suggestion_start)..cmp::min(range.end.0, suggestion_end);
+            if suggestion_range.start < suggestion_range.end {
+                let point_range = suggestion_range.start - suggestion_start
+                    ..suggestion_range.end - suggestion_start;
+                let offset_range = suggestion.text.point_to_offset(point_range.start)
+                    ..suggestion.text.point_to_offset(point_range.end);
+                summary += suggestion
+                    .text
+                    .cursor(offset_range.start)
+                    .summary::<TextSummary>(offset_range.end);
+            }
+
+            let suffix_range = cmp::max(range.start.0, suggestion_end)..range.end.0;
+            if suffix_range.start < suffix_range.end {
+                let start = suggestion_start + (suffix_range.start - suggestion_end);
+                let end = suggestion_start + (suffix_range.end - suggestion_end);
+                summary += self
+                    .fold_snapshot
+                    .text_summary_for_range(FoldPoint(start)..FoldPoint(end));
+            }
+
+            summary
+        } else {
+            self.fold_snapshot
+                .text_summary_for_range(FoldPoint(range.start.0)..FoldPoint(range.end.0))
+        }
+    }
+
+    pub fn chars_at(&self, start: SuggestionPoint) -> impl '_ + Iterator<Item = char> {
+        let start = self.to_offset(start);
+        self.chunks(start..self.len(), false, None, None)
+            .flat_map(|chunk| chunk.text.chars())
+    }
+
+    pub fn chunks<'a>(
+        &'a self,
+        range: Range<SuggestionOffset>,
+        language_aware: bool,
+        text_highlights: Option<&'a TextHighlights>,
+        suggestion_highlight: Option<HighlightStyle>,
+    ) -> SuggestionChunks<'a> {
+        if let Some(suggestion) = self.suggestion.as_ref() {
+            let suggestion_range =
+                suggestion.position.0..suggestion.position.0 + suggestion.text.len();
+
+            let prefix_chunks = if range.start.0 < suggestion_range.start {
+                Some(self.fold_snapshot.chunks(
+                    FoldOffset(range.start.0)
+                        ..cmp::min(FoldOffset(suggestion_range.start), FoldOffset(range.end.0)),
+                    language_aware,
+                    text_highlights,
+                ))
+            } else {
+                None
+            };
+
+            let clipped_suggestion_range = cmp::max(range.start.0, suggestion_range.start)
+                ..cmp::min(range.end.0, suggestion_range.end);
+            let suggestion_chunks = if clipped_suggestion_range.start < clipped_suggestion_range.end
+            {
+                let start = clipped_suggestion_range.start - suggestion_range.start;
+                let end = clipped_suggestion_range.end - suggestion_range.start;
+                Some(suggestion.text.chunks_in_range(start..end))
+            } else {
+                None
+            };
+
+            let suffix_chunks = if range.end.0 > suggestion_range.end {
+                let start = cmp::max(suggestion_range.end, range.start.0) - suggestion_range.len();
+                let end = range.end.0 - suggestion_range.len();
+                Some(self.fold_snapshot.chunks(
+                    FoldOffset(start)..FoldOffset(end),
+                    language_aware,
+                    text_highlights,
+                ))
+            } else {
+                None
+            };
+
+            SuggestionChunks {
+                prefix_chunks,
+                suggestion_chunks,
+                suffix_chunks,
+                highlight_style: suggestion_highlight,
+            }
+        } else {
+            SuggestionChunks {
+                prefix_chunks: Some(self.fold_snapshot.chunks(
+                    FoldOffset(range.start.0)..FoldOffset(range.end.0),
+                    language_aware,
+                    text_highlights,
+                )),
+                suggestion_chunks: None,
+                suffix_chunks: None,
+                highlight_style: None,
+            }
+        }
+    }
+
+    pub fn buffer_rows<'a>(&'a self, row: u32) -> SuggestionBufferRows<'a> {
+        let suggestion_range = if let Some(suggestion) = self.suggestion.as_ref() {
+            let start = suggestion.position.to_point(&self.fold_snapshot).0;
+            let end = start + suggestion.text.max_point();
+            start.row..end.row
+        } else {
+            u32::MAX..u32::MAX
+        };
+
+        let fold_buffer_rows = if row <= suggestion_range.start {
+            self.fold_snapshot.buffer_rows(row)
+        } else if row > suggestion_range.end {
+            self.fold_snapshot
+                .buffer_rows(row - (suggestion_range.end - suggestion_range.start))
+        } else {
+            let mut rows = self.fold_snapshot.buffer_rows(suggestion_range.start);
+            rows.next();
+            rows
+        };
+
+        SuggestionBufferRows {
+            current_row: row,
+            suggestion_row_start: suggestion_range.start,
+            suggestion_row_end: suggestion_range.end,
+            fold_buffer_rows,
+        }
+    }
+
+    #[cfg(test)]
+    pub fn text(&self) -> String {
+        self.chunks(Default::default()..self.len(), false, None, None)
+            .map(|chunk| chunk.text)
+            .collect()
+    }
+}
+
+pub struct SuggestionChunks<'a> {
+    prefix_chunks: Option<FoldChunks<'a>>,
+    suggestion_chunks: Option<text::Chunks<'a>>,
+    suffix_chunks: Option<FoldChunks<'a>>,
+    highlight_style: Option<HighlightStyle>,
+}
+
+impl<'a> Iterator for SuggestionChunks<'a> {
+    type Item = Chunk<'a>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        if let Some(chunks) = self.prefix_chunks.as_mut() {
+            if let Some(chunk) = chunks.next() {
+                return Some(chunk);
+            } else {
+                self.prefix_chunks = None;
+            }
+        }
+
+        if let Some(chunks) = self.suggestion_chunks.as_mut() {
+            if let Some(chunk) = chunks.next() {
+                return Some(Chunk {
+                    text: chunk,
+                    syntax_highlight_id: None,
+                    highlight_style: self.highlight_style,
+                    diagnostic_severity: None,
+                    is_unnecessary: false,
+                });
+            } else {
+                self.suggestion_chunks = None;
+            }
+        }
+
+        if let Some(chunks) = self.suffix_chunks.as_mut() {
+            if let Some(chunk) = chunks.next() {
+                return Some(chunk);
+            } else {
+                self.suffix_chunks = None;
+            }
+        }
+
+        None
+    }
+}
+
+#[derive(Clone)]
+pub struct SuggestionBufferRows<'a> {
+    current_row: u32,
+    suggestion_row_start: u32,
+    suggestion_row_end: u32,
+    fold_buffer_rows: FoldBufferRows<'a>,
+}
+
+impl<'a> Iterator for SuggestionBufferRows<'a> {
+    type Item = Option<u32>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let row = post_inc(&mut self.current_row);
+        if row <= self.suggestion_row_start || row > self.suggestion_row_end {
+            self.fold_buffer_rows.next()
+        } else {
+            Some(None)
+        }
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::{display_map::fold_map::FoldMap, MultiBuffer};
+    use gpui::AppContext;
+    use rand::{prelude::StdRng, Rng};
+    use settings::Settings;
+    use std::{
+        env,
+        ops::{Bound, RangeBounds},
+    };
+
+    #[gpui::test]
+    fn test_basic(cx: &mut AppContext) {
+        let buffer = MultiBuffer::build_simple("abcdefghi", cx);
+        let buffer_edits = buffer.update(cx, |buffer, _| buffer.subscribe());
+        let (mut fold_map, fold_snapshot) = FoldMap::new(buffer.read(cx).snapshot(cx));
+        let (suggestion_map, suggestion_snapshot) = SuggestionMap::new(fold_snapshot.clone());
+        assert_eq!(suggestion_snapshot.text(), "abcdefghi");
+
+        let (suggestion_snapshot, _, _) = suggestion_map.replace(
+            Some(Suggestion {
+                position: 3,
+                text: "123\n456".into(),
+            }),
+            fold_snapshot,
+            Default::default(),
+        );
+        assert_eq!(suggestion_snapshot.text(), "abc123\n456defghi");
+
+        buffer.update(cx, |buffer, cx| {
+            buffer.edit(
+                [(0..0, "ABC"), (3..3, "DEF"), (4..4, "GHI"), (9..9, "JKL")],
+                None,
+                cx,
+            )
+        });
+        let (fold_snapshot, fold_edits) = fold_map.read(
+            buffer.read(cx).snapshot(cx),
+            buffer_edits.consume().into_inner(),
+        );
+        let (suggestion_snapshot, _) = suggestion_map.sync(fold_snapshot.clone(), fold_edits);
+        assert_eq!(suggestion_snapshot.text(), "ABCabcDEF123\n456dGHIefghiJKL");
+
+        let (mut fold_map_writer, _, _) =
+            fold_map.write(buffer.read(cx).snapshot(cx), Default::default());
+        let (fold_snapshot, fold_edits) = fold_map_writer.fold([0..3]);
+        let (suggestion_snapshot, _) = suggestion_map.sync(fold_snapshot, fold_edits);
+        assert_eq!(suggestion_snapshot.text(), "⋯abcDEF123\n456dGHIefghiJKL");
+
+        let (mut fold_map_writer, _, _) =
+            fold_map.write(buffer.read(cx).snapshot(cx), Default::default());
+        let (fold_snapshot, fold_edits) = fold_map_writer.fold([6..10]);
+        let (suggestion_snapshot, _) = suggestion_map.sync(fold_snapshot, fold_edits);
+        assert_eq!(suggestion_snapshot.text(), "⋯abc⋯GHIefghiJKL");
+    }
+
+    #[gpui::test(iterations = 100)]
+    fn test_random_suggestions(cx: &mut AppContext, mut rng: StdRng) {
+        cx.set_global(Settings::test(cx));
+        let operations = env::var("OPERATIONS")
+            .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
+            .unwrap_or(10);
+
+        let len = rng.gen_range(0..30);
+        let buffer = if rng.gen() {
+            let text = util::RandomCharIter::new(&mut rng)
+                .take(len)
+                .collect::<String>();
+            MultiBuffer::build_simple(&text, cx)
+        } else {
+            MultiBuffer::build_random(&mut rng, cx)
+        };
+        let mut buffer_snapshot = buffer.read(cx).snapshot(cx);
+        log::info!("buffer text: {:?}", buffer_snapshot.text());
+
+        let (mut fold_map, mut fold_snapshot) = FoldMap::new(buffer_snapshot.clone());
+        let (suggestion_map, mut suggestion_snapshot) = SuggestionMap::new(fold_snapshot.clone());
+
+        for _ in 0..operations {
+            let mut suggestion_edits = Patch::default();
+
+            let mut prev_suggestion_text = suggestion_snapshot.text();
+            let mut buffer_edits = Vec::new();
+            match rng.gen_range(0..=100) {
+                0..=29 => {
+                    let (_, edits) = suggestion_map.randomly_mutate(&mut rng);
+                    suggestion_edits = suggestion_edits.compose(edits);
+                }
+                30..=59 => {
+                    for (new_fold_snapshot, fold_edits) in fold_map.randomly_mutate(&mut rng) {
+                        fold_snapshot = new_fold_snapshot;
+                        let (_, edits) = suggestion_map.sync(fold_snapshot.clone(), fold_edits);
+                        suggestion_edits = suggestion_edits.compose(edits);
+                    }
+                }
+                _ => buffer.update(cx, |buffer, cx| {
+                    let subscription = buffer.subscribe();
+                    let edit_count = rng.gen_range(1..=5);
+                    buffer.randomly_mutate(&mut rng, edit_count, cx);
+                    buffer_snapshot = buffer.snapshot(cx);
+                    let edits = subscription.consume().into_inner();
+                    log::info!("editing {:?}", edits);
+                    buffer_edits.extend(edits);
+                }),
+            };
+
+            let (new_fold_snapshot, fold_edits) =
+                fold_map.read(buffer_snapshot.clone(), buffer_edits);
+            fold_snapshot = new_fold_snapshot;
+            let (new_suggestion_snapshot, edits) =
+                suggestion_map.sync(fold_snapshot.clone(), fold_edits);
+            suggestion_snapshot = new_suggestion_snapshot;
+            suggestion_edits = suggestion_edits.compose(edits);
+
+            log::info!("buffer text: {:?}", buffer_snapshot.text());
+            log::info!("folds text: {:?}", fold_snapshot.text());
+            log::info!("suggestions text: {:?}", suggestion_snapshot.text());
+
+            let mut expected_text = Rope::from(fold_snapshot.text().as_str());
+            let mut expected_buffer_rows = fold_snapshot.buffer_rows(0).collect::<Vec<_>>();
+            if let Some(suggestion) = suggestion_snapshot.suggestion.as_ref() {
+                expected_text.replace(
+                    suggestion.position.0..suggestion.position.0,
+                    &suggestion.text.to_string(),
+                );
+                let suggestion_start = suggestion.position.to_point(&fold_snapshot).0;
+                let suggestion_end = suggestion_start + suggestion.text.max_point();
+                expected_buffer_rows.splice(
+                    (suggestion_start.row + 1) as usize..(suggestion_start.row + 1) as usize,
+                    (0..suggestion_end.row - suggestion_start.row).map(|_| None),
+                );
+            }
+            assert_eq!(suggestion_snapshot.text(), expected_text.to_string());
+            for row_start in 0..expected_buffer_rows.len() {
+                assert_eq!(
+                    suggestion_snapshot
+                        .buffer_rows(row_start as u32)
+                        .collect::<Vec<_>>(),
+                    &expected_buffer_rows[row_start..],
+                    "incorrect buffer rows starting at {}",
+                    row_start
+                );
+            }
+
+            for _ in 0..5 {
+                let mut end = rng.gen_range(0..=suggestion_snapshot.len().0);
+                end = expected_text.clip_offset(end, Bias::Right);
+                let mut start = rng.gen_range(0..=end);
+                start = expected_text.clip_offset(start, Bias::Right);
+
+                let actual_text = suggestion_snapshot
+                    .chunks(
+                        SuggestionOffset(start)..SuggestionOffset(end),
+                        false,
+                        None,
+                        None,
+                    )
+                    .map(|chunk| chunk.text)
+                    .collect::<String>();
+                assert_eq!(
+                    actual_text,
+                    expected_text.slice(start..end).to_string(),
+                    "incorrect text in range {:?}",
+                    start..end
+                );
+
+                let start_point = SuggestionPoint(expected_text.offset_to_point(start));
+                let end_point = SuggestionPoint(expected_text.offset_to_point(end));
+                assert_eq!(
+                    suggestion_snapshot.text_summary_for_range(start_point..end_point),
+                    expected_text.slice(start..end).summary()
+                );
+            }
+
+            for edit in suggestion_edits.into_inner() {
+                prev_suggestion_text.replace_range(
+                    edit.new.start.0..edit.new.start.0 + edit.old_len().0,
+                    &suggestion_snapshot.text()[edit.new.start.0..edit.new.end.0],
+                );
+            }
+            assert_eq!(prev_suggestion_text, suggestion_snapshot.text());
+
+            assert_eq!(expected_text.max_point(), suggestion_snapshot.max_point().0);
+            assert_eq!(expected_text.len(), suggestion_snapshot.len().0);
+
+            let mut suggestion_point = SuggestionPoint::default();
+            let mut suggestion_offset = SuggestionOffset::default();
+            for ch in expected_text.chars() {
+                assert_eq!(
+                    suggestion_snapshot.to_offset(suggestion_point),
+                    suggestion_offset,
+                    "invalid to_offset({:?})",
+                    suggestion_point
+                );
+                assert_eq!(
+                    suggestion_snapshot.to_point(suggestion_offset),
+                    suggestion_point,
+                    "invalid to_point({:?})",
+                    suggestion_offset
+                );
+                assert_eq!(
+                    suggestion_snapshot
+                        .to_suggestion_point(suggestion_snapshot.to_fold_point(suggestion_point)),
+                    suggestion_snapshot.clip_point(suggestion_point, Bias::Left),
+                );
+
+                let mut bytes = [0; 4];
+                for byte in ch.encode_utf8(&mut bytes).as_bytes() {
+                    suggestion_offset.0 += 1;
+                    if *byte == b'\n' {
+                        suggestion_point.0 += Point::new(1, 0);
+                    } else {
+                        suggestion_point.0 += Point::new(0, 1);
+                    }
+
+                    let clipped_left_point =
+                        suggestion_snapshot.clip_point(suggestion_point, Bias::Left);
+                    let clipped_right_point =
+                        suggestion_snapshot.clip_point(suggestion_point, Bias::Right);
+                    assert!(
+                        clipped_left_point <= clipped_right_point,
+                        "clipped left point {:?} is greater than clipped right point {:?}",
+                        clipped_left_point,
+                        clipped_right_point
+                    );
+                    assert_eq!(
+                        clipped_left_point.0,
+                        expected_text.clip_point(clipped_left_point.0, Bias::Left)
+                    );
+                    assert_eq!(
+                        clipped_right_point.0,
+                        expected_text.clip_point(clipped_right_point.0, Bias::Right)
+                    );
+                    assert!(clipped_left_point <= suggestion_snapshot.max_point());
+                    assert!(clipped_right_point <= suggestion_snapshot.max_point());
+
+                    if let Some(suggestion) = suggestion_snapshot.suggestion.as_ref() {
+                        let suggestion_start = suggestion.position.to_point(&fold_snapshot).0;
+                        let suggestion_end = suggestion_start + suggestion.text.max_point();
+                        let invalid_range = (
+                            Bound::Excluded(suggestion_start),
+                            Bound::Included(suggestion_end),
+                        );
+                        assert!(
+                            !invalid_range.contains(&clipped_left_point.0),
+                            "clipped left point {:?} is inside invalid suggestion range {:?}",
+                            clipped_left_point,
+                            invalid_range
+                        );
+                        assert!(
+                            !invalid_range.contains(&clipped_right_point.0),
+                            "clipped right point {:?} is inside invalid suggestion range {:?}",
+                            clipped_right_point,
+                            invalid_range
+                        );
+                    }
+                }
+            }
+        }
+    }
+
+    impl SuggestionMap {
+        pub fn randomly_mutate(
+            &self,
+            rng: &mut impl Rng,
+        ) -> (SuggestionSnapshot, Vec<SuggestionEdit>) {
+            let fold_snapshot = self.0.lock().fold_snapshot.clone();
+            let new_suggestion = if rng.gen_bool(0.3) {
+                None
+            } else {
+                let index = rng.gen_range(0..=fold_snapshot.buffer_snapshot().len());
+                let len = rng.gen_range(0..30);
+                Some(Suggestion {
+                    position: index,
+                    text: util::RandomCharIter::new(rng)
+                        .take(len)
+                        .filter(|ch| *ch != '\r')
+                        .collect::<String>()
+                        .as_str()
+                        .into(),
+                })
+            };
+
+            log::info!("replacing suggestion with {:?}", new_suggestion);
+            let (snapshot, edits, _) =
+                self.replace(new_suggestion, fold_snapshot, Default::default());
+            (snapshot, edits)
+        }
+    }
+}
--- a/crates/editor/src/display_map/tab_map.rs
+++ b/crates/editor/src/display_map/tab_map.rs
@@ -1,86 +1,140 @@
 use super::{
-    fold_map::{self, FoldEdit, FoldPoint, FoldSnapshot},
+    suggestion_map::{self, SuggestionChunks, SuggestionEdit, SuggestionPoint, SuggestionSnapshot},
    TextHighlights,
 };
 use crate::MultiBufferSnapshot;
+use gpui::fonts::HighlightStyle;
 use language::{Chunk, Point};
 use parking_lot::Mutex;
 use std::{cmp, mem, num::NonZeroU32, ops::Range};
 use sum_tree::Bias;

+const MAX_EXPANSION_COLUMN: u32 = 256;
+
 pub struct TabMap(Mutex<TabSnapshot>);

 impl TabMap {
-    pub fn new(input: FoldSnapshot, tab_size: NonZeroU32) -> (Self, TabSnapshot) {
+    pub fn new(input: SuggestionSnapshot, tab_size: NonZeroU32) -> (Self, TabSnapshot) {
        let snapshot = TabSnapshot {
-            fold_snapshot: input,
+            suggestion_snapshot: input,
            tab_size,
+            max_expansion_column: MAX_EXPANSION_COLUMN,
            version: 0,
        };
        (Self(Mutex::new(snapshot.clone())), snapshot)
    }

+    #[cfg(test)]
+    pub fn set_max_expansion_column(&self, column: u32) -> TabSnapshot {
+        self.0.lock().max_expansion_column = column;
+        self.0.lock().clone()
+    }
+
    pub fn sync(
        &self,
-        fold_snapshot: FoldSnapshot,
-        mut fold_edits: Vec<FoldEdit>,
+        suggestion_snapshot: SuggestionSnapshot,
+        mut suggestion_edits: Vec<SuggestionEdit>,
        tab_size: NonZeroU32,
    ) -> (TabSnapshot, Vec<TabEdit>) {
        let mut old_snapshot = self.0.lock();
        let mut new_snapshot = TabSnapshot {
-            fold_snapshot,
+            suggestion_snapshot,
            tab_size,
+            max_expansion_column: old_snapshot.max_expansion_column,
            version: old_snapshot.version,
        };

-        if old_snapshot.fold_snapshot.version != new_snapshot.fold_snapshot.version {
+        if old_snapshot.suggestion_snapshot.version != new_snapshot.suggestion_snapshot.version {
            new_snapshot.version += 1;
        }

-        let old_max_offset = old_snapshot.fold_snapshot.len();
-        let mut tab_edits = Vec::with_capacity(fold_edits.len());
+        let mut tab_edits = Vec::with_capacity(suggestion_edits.len());

        if old_snapshot.tab_size == new_snapshot.tab_size {
-            for fold_edit in &mut fold_edits {
-                let mut delta = 0;
-                for chunk in old_snapshot.fold_snapshot.chunks(
-                    fold_edit.old.end..old_max_offset,
+            // Expand each edit to include the next tab on the same line as the edit,
+            // and any subsequent tabs on that line that moved across the tab expansion
+            // boundary.
+            for suggestion_edit in &mut suggestion_edits {
+                let old_end = old_snapshot
+                    .suggestion_snapshot
+                    .to_point(suggestion_edit.old.end);
+                let old_end_row_successor_offset =
+                    old_snapshot.suggestion_snapshot.to_offset(cmp::min(
+                        SuggestionPoint::new(old_end.row() + 1, 0),
+                        old_snapshot.suggestion_snapshot.max_point(),
+                    ));
+                let new_end = new_snapshot
+                    .suggestion_snapshot
+                    .to_point(suggestion_edit.new.end);
+
+                let mut offset_from_edit = 0;
+                let mut first_tab_offset = None;
+                let mut last_tab_with_changed_expansion_offset = None;
+                'outer: for chunk in old_snapshot.suggestion_snapshot.chunks(
+                    suggestion_edit.old.end..old_end_row_successor_offset,
                    false,
                    None,
+                    None,
                ) {
-                    let patterns: &[_] = &['\t', '\n'];
-                    if let Some(ix) = chunk.text.find(patterns) {
-                        if &chunk.text[ix..ix + 1] == "\t" {
-                            fold_edit.old.end.0 += delta + ix + 1;
-                            fold_edit.new.end.0 += delta + ix + 1;
+                    for (ix, _) in chunk.text.match_indices('\t') {
+                        let offset_from_edit = offset_from_edit + (ix as u32);
+                        if first_tab_offset.is_none() {
+                            first_tab_offset = Some(offset_from_edit);
                        }

-                        break;
+                        let old_column = old_end.column() + offset_from_edit;
+                        let new_column = new_end.column() + offset_from_edit;
+                        let was_expanded = old_column < old_snapshot.max_expansion_column;
+                        let is_expanded = new_column < new_snapshot.max_expansion_column;
+                        if was_expanded != is_expanded {
+                            last_tab_with_changed_expansion_offset = Some(offset_from_edit);
+                        } else if !was_expanded && !is_expanded {
+                            break 'outer;
+                        }
                    }

-                    delta += chunk.text.len();
+                    offset_from_edit += chunk.text.len() as u32;
+                    if old_end.column() + offset_from_edit >= old_snapshot.max_expansion_column
+                        && new_end.column() + offset_from_edit >= new_snapshot.max_expansion_column
+                    {
+                        break;
+                    }
+                }
+
+                if let Some(offset) = last_tab_with_changed_expansion_offset.or(first_tab_offset) {
+                    suggestion_edit.old.end.0 += offset as usize + 1;
+                    suggestion_edit.new.end.0 += offset as usize + 1;
                }
            }

+            // Combine any edits that overlap due to the expansion.
            let mut ix = 1;
-            while ix < fold_edits.len() {
-                let (prev_edits, next_edits) = fold_edits.split_at_mut(ix);
+            while ix < suggestion_edits.len() {
+                let (prev_edits, next_edits) = suggestion_edits.split_at_mut(ix);
                let prev_edit = prev_edits.last_mut().unwrap();
                let edit = &next_edits[0];
                if prev_edit.old.end >= edit.old.start {
                    prev_edit.old.end = edit.old.end;
                    prev_edit.new.end = edit.new.end;
-                    fold_edits.remove(ix);
+                    suggestion_edits.remove(ix);
                } else {
                    ix += 1;
                }
            }

-            for fold_edit in fold_edits {
-                let old_start = fold_edit.old.start.to_point(&old_snapshot.fold_snapshot);
-                let old_end = fold_edit.old.end.to_point(&old_snapshot.fold_snapshot);
-                let new_start = fold_edit.new.start.to_point(&new_snapshot.fold_snapshot);
-                let new_end = fold_edit.new.end.to_point(&new_snapshot.fold_snapshot);
+            for suggestion_edit in suggestion_edits {
+                let old_start = old_snapshot
+                    .suggestion_snapshot
+                    .to_point(suggestion_edit.old.start);
+                let old_end = old_snapshot
+                    .suggestion_snapshot
+                    .to_point(suggestion_edit.old.end);
+                let new_start = new_snapshot
+                    .suggestion_snapshot
+                    .to_point(suggestion_edit.new.start);
+                let new_end = new_snapshot
+                    .suggestion_snapshot
+                    .to_point(suggestion_edit.new.end);
                tab_edits.push(TabEdit {
                    old: old_snapshot.to_tab_point(old_start)..old_snapshot.to_tab_point(old_end),
                    new: new_snapshot.to_tab_point(new_start)..new_snapshot.to_tab_point(new_end),
@@ -101,27 +155,26 @@ impl TabMap {

 #[derive(Clone)]
 pub struct TabSnapshot {
-    pub fold_snapshot: FoldSnapshot,
+    pub suggestion_snapshot: SuggestionSnapshot,
    pub tab_size: NonZeroU32,
+    pub max_expansion_column: u32,
    pub version: usize,
 }

 impl TabSnapshot {
    pub fn buffer_snapshot(&self) -> &MultiBufferSnapshot {
-        self.fold_snapshot.buffer_snapshot()
+        self.suggestion_snapshot.buffer_snapshot()
    }

    pub fn line_len(&self, row: u32) -> u32 {
        let max_point = self.max_point();
        if row < max_point.row() {
-            self.chunks(
-                TabPoint::new(row, 0)..TabPoint::new(row + 1, 0),
-                false,
-                None,
-            )
-            .map(|chunk| chunk.text.len() as u32)
-            .sum::<u32>()
-                - 1
+            self.to_tab_point(SuggestionPoint::new(
+                row,
+                self.suggestion_snapshot.line_len(row),
+            ))
+            .0
+            .column
        } else {
            max_point.column()
        }
@@ -132,10 +185,10 @@ impl TabSnapshot {
    }

    pub fn text_summary_for_range(&self, range: Range<TabPoint>) -> TextSummary {
-        let input_start = self.to_fold_point(range.start, Bias::Left).0;
-        let input_end = self.to_fold_point(range.end, Bias::Right).0;
+        let input_start = self.to_suggestion_point(range.start, Bias::Left).0;
+        let input_end = self.to_suggestion_point(range.end, Bias::Right).0;
        let input_summary = self
-            .fold_snapshot
+            .suggestion_snapshot
            .text_summary_for_range(input_start..input_end);

        let mut first_line_chars = 0;
@@ -145,7 +198,7 @@ impl TabSnapshot {
            self.max_point()
        };
        for c in self
-            .chunks(range.start..line_end, false, None)
+            .chunks(range.start..line_end, false, None, None)
            .flat_map(|chunk| chunk.text.chars())
        {
            if c == '\n' {
@@ -159,7 +212,12 @@ impl TabSnapshot {
            last_line_chars = first_line_chars;
        } else {
            for _ in self
-                .chunks(TabPoint::new(range.end.row(), 0)..range.end, false, None)
+                .chunks(
+                    TabPoint::new(range.end.row(), 0)..range.end,
+                    false,
+                    None,
+                    None,
+                )
                .flat_map(|chunk| chunk.text.chars())
            {
                last_line_chars += 1;
@@ -180,120 +238,133 @@ impl TabSnapshot {
        range: Range<TabPoint>,
        language_aware: bool,
        text_highlights: Option<&'a TextHighlights>,
+        suggestion_highlight: Option<HighlightStyle>,
    ) -> TabChunks<'a> {
        let (input_start, expanded_char_column, to_next_stop) =
-            self.to_fold_point(range.start, Bias::Left);
-        let input_start = input_start.to_offset(&self.fold_snapshot);
+            self.to_suggestion_point(range.start, Bias::Left);
+        let input_column = input_start.column();
+        let input_start = self.suggestion_snapshot.to_offset(input_start);
        let input_end = self
-            .to_fold_point(range.end, Bias::Right)
-            .0
-            .to_offset(&self.fold_snapshot);
-        let to_next_stop = if range.start.0 + Point::new(0, to_next_stop as u32) > range.end.0 {
-            (range.end.column() - range.start.column()) as usize
+            .suggestion_snapshot
+            .to_offset(self.to_suggestion_point(range.end, Bias::Right).0);
+        let to_next_stop = if range.start.0 + Point::new(0, to_next_stop) > range.end.0 {
+            range.end.column() - range.start.column()
        } else {
            to_next_stop
        };

        TabChunks {
-            fold_chunks: self.fold_snapshot.chunks(
+            suggestion_chunks: self.suggestion_snapshot.chunks(
                input_start..input_end,
                language_aware,
                text_highlights,
+                suggestion_highlight,
            ),
+            input_column,
            column: expanded_char_column,
+            max_expansion_column: self.max_expansion_column,
            output_position: range.start.0,
            max_output_position: range.end.0,
            tab_size: self.tab_size,
            chunk: Chunk {
-                text: &SPACES[0..to_next_stop],
+                text: &SPACES[0..(to_next_stop as usize)],
                ..Default::default()
            },
-            skip_leading_tab: to_next_stop > 0,
+            inside_leading_tab: to_next_stop > 0,
        }
    }

-    pub fn buffer_rows(&self, row: u32) -> fold_map::FoldBufferRows {
-        self.fold_snapshot.buffer_rows(row)
+    pub fn buffer_rows(&self, row: u32) -> suggestion_map::SuggestionBufferRows {
+        self.suggestion_snapshot.buffer_rows(row)
    }

    #[cfg(test)]
    pub fn text(&self) -> String {
-        self.chunks(TabPoint::zero()..self.max_point(), false, None)
+        self.chunks(TabPoint::zero()..self.max_point(), false, None, None)
            .map(|chunk| chunk.text)
            .collect()
    }

    pub fn max_point(&self) -> TabPoint {
-        self.to_tab_point(self.fold_snapshot.max_point())
+        self.to_tab_point(self.suggestion_snapshot.max_point())
    }

    pub fn clip_point(&self, point: TabPoint, bias: Bias) -> TabPoint {
        self.to_tab_point(
-            self.fold_snapshot
-                .clip_point(self.to_fold_point(point, bias).0, bias),
+            self.suggestion_snapshot
+                .clip_point(self.to_suggestion_point(point, bias).0, bias),
        )
    }

-    pub fn to_tab_point(&self, input: FoldPoint) -> TabPoint {
-        let chars = self.fold_snapshot.chars_at(FoldPoint::new(input.row(), 0));
-        let expanded = Self::expand_tabs(chars, input.column() as usize, self.tab_size);
-        TabPoint::new(input.row(), expanded as u32)
+    pub fn to_tab_point(&self, input: SuggestionPoint) -> TabPoint {
+        let chars = self
+            .suggestion_snapshot
+            .chars_at(SuggestionPoint::new(input.row(), 0));
+        let expanded = self.expand_tabs(chars, input.column());
+        TabPoint::new(input.row(), expanded)
    }

-    pub fn to_fold_point(&self, output: TabPoint, bias: Bias) -> (FoldPoint, usize, usize) {
-        let chars = self.fold_snapshot.chars_at(FoldPoint::new(output.row(), 0));
-        let expanded = output.column() as usize;
+    pub fn to_suggestion_point(&self, output: TabPoint, bias: Bias) -> (SuggestionPoint, u32, u32) {
+        let chars = self
+            .suggestion_snapshot
+            .chars_at(SuggestionPoint::new(output.row(), 0));
+        let expanded = output.column();
        let (collapsed, expanded_char_column, to_next_stop) =
-            Self::collapse_tabs(chars, expanded, bias, self.tab_size);
+            self.collapse_tabs(chars, expanded, bias);
        (
-            FoldPoint::new(output.row(), collapsed as u32),
+            SuggestionPoint::new(output.row(), collapsed as u32),
            expanded_char_column,
            to_next_stop,
        )
    }

    pub fn make_tab_point(&self, point: Point, bias: Bias) -> TabPoint {
-        self.to_tab_point(self.fold_snapshot.to_fold_point(point, bias))
+        let fold_point = self
+            .suggestion_snapshot
+            .fold_snapshot
+            .to_fold_point(point, bias);
+        let suggestion_point = self.suggestion_snapshot.to_suggestion_point(fold_point);
+        self.to_tab_point(suggestion_point)
    }

    pub fn to_point(&self, point: TabPoint, bias: Bias) -> Point {
-        self.to_fold_point(point, bias)
-            .0
-            .to_buffer_point(&self.fold_snapshot)
+        let suggestion_point = self.to_suggestion_point(point, bias).0;
+        let fold_point = self.suggestion_snapshot.to_fold_point(suggestion_point);
+        fold_point.to_buffer_point(&self.suggestion_snapshot.fold_snapshot)
    }

-    fn expand_tabs(
-        chars: impl Iterator<Item = char>,
-        column: usize,
-        tab_size: NonZeroU32,
-    ) -> usize {
+    fn expand_tabs(&self, chars: impl Iterator<Item = char>, column: u32) -> u32 {
+        let tab_size = self.tab_size.get();
+
        let mut expanded_chars = 0;
        let mut expanded_bytes = 0;
        let mut collapsed_bytes = 0;
+        let end_column = column.min(self.max_expansion_column);
        for c in chars {
-            if collapsed_bytes == column {
+            if collapsed_bytes >= end_column {
                break;
            }
            if c == '\t' {
-                let tab_size = tab_size.get() as usize;
                let tab_len = tab_size - expanded_chars % tab_size;
                expanded_bytes += tab_len;
                expanded_chars += tab_len;
            } else {
-                expanded_bytes += c.len_utf8();
+                expanded_bytes += c.len_utf8() as u32;
                expanded_chars += 1;
            }
-            collapsed_bytes += c.len_utf8();
+            collapsed_bytes += c.len_utf8() as u32;
        }
-        expanded_bytes
+        expanded_bytes + column.saturating_sub(collapsed_bytes)
    }

    fn collapse_tabs(
+        &self,
        chars: impl Iterator<Item = char>,
-        column: usize,
+        column: u32,
        bias: Bias,
-        tab_size: NonZeroU32,
-    ) -> (usize, usize, usize) {
+    ) -> (u32, u32, u32) {
+        let tab_size = self.tab_size.get();
+
        let mut expanded_bytes = 0;
        let mut expanded_chars = 0;
        let mut collapsed_bytes = 0;
@@ -301,9 +372,11 @@ impl TabSnapshot {
            if expanded_bytes >= column {
                break;
            }
+            if collapsed_bytes >= self.max_expansion_column {
+                break;
+            }

            if c == '\t' {
-                let tab_size = tab_size.get() as usize;
                let tab_len = tab_size - (expanded_chars % tab_size);
                expanded_chars += tab_len;
                expanded_bytes += tab_len;
@@ -316,7 +389,7 @@ impl TabSnapshot {
                }
            } else {
                expanded_chars += 1;
-                expanded_bytes += c.len_utf8();
+                expanded_bytes += c.len_utf8() as u32;
            }

            if expanded_bytes > column && matches!(bias, Bias::Left) {
@@ -324,9 +397,13 @@ impl TabSnapshot {
                break;
            }

-            collapsed_bytes += c.len_utf8();
+            collapsed_bytes += c.len_utf8() as u32;
        }
-        (collapsed_bytes, expanded_chars, 0)
+        (
+            collapsed_bytes + column.saturating_sub(expanded_bytes),
+            expanded_chars,
+            0,
+        )
    }
 }

@@ -412,13 +489,15 @@ impl<'a> std::ops::AddAssign<&'a Self> for TextSummary {
 const SPACES: &str = "                ";

 pub struct TabChunks<'a> {
-    fold_chunks: fold_map::FoldChunks<'a>,
+    suggestion_chunks: SuggestionChunks<'a>,
    chunk: Chunk<'a>,
-    column: usize,
+    column: u32,
+    max_expansion_column: u32,
    output_position: Point,
+    input_column: u32,
    max_output_position: Point,
    tab_size: NonZeroU32,
-    skip_leading_tab: bool,
+    inside_leading_tab: bool,
 }

 impl<'a> Iterator for TabChunks<'a> {
@@ -426,11 +505,12 @@ impl<'a> Iterator for TabChunks<'a> {

    fn next(&mut self) -> Option<Self::Item> {
        if self.chunk.text.is_empty() {
-            if let Some(chunk) = self.fold_chunks.next() {
+            if let Some(chunk) = self.suggestion_chunks.next() {
                self.chunk = chunk;
-                if self.skip_leading_tab {
+                if self.inside_leading_tab {
                    self.chunk.text = &self.chunk.text[1..];
-                    self.skip_leading_tab = false;
+                    self.inside_leading_tab = false;
+                    self.input_column += 1;
                }
            } else {
                return None;
@@ -449,27 +529,36 @@ impl<'a> Iterator for TabChunks<'a> {
                        });
                    } else {
                        self.chunk.text = &self.chunk.text[1..];
-                        let tab_size = self.tab_size.get() as u32;
-                        let mut len = tab_size - self.column as u32 % tab_size;
+                        let tab_size = if self.input_column < self.max_expansion_column {
+                            self.tab_size.get() as u32
+                        } else {
+                            1
+                        };
+                        let mut len = tab_size - self.column % tab_size;
                        let next_output_position = cmp::min(
                            self.output_position + Point::new(0, len),
                            self.max_output_position,
                        );
                        len = next_output_position.column - self.output_position.column;
-                        self.column += len as usize;
+                        self.column += len;
+                        self.input_column += 1;
                        self.output_position = next_output_position;
                        return Some(Chunk {
-                            text: &SPACES[0..len as usize],
+                            text: &SPACES[..len as usize],
                            ..self.chunk
                        });
                    }
                }
                '\n' => {
                    self.column = 0;
+                    self.input_column = 0;
                    self.output_position += Point::new(1, 0);
                }
                _ => {
                    self.column += 1;
+                    if !self.inside_leading_tab {
+                        self.input_column += c.len_utf8() as u32;
+                    }
                    self.output_position.column += c.len_utf8() as u32;
                }
            }
@@ -482,27 +571,91 @@ impl<'a> Iterator for TabChunks<'a> {
 #[cfg(test)]
 mod tests {
    use super::*;
-    use crate::{display_map::fold_map::FoldMap, MultiBuffer};
+    use crate::{
+        display_map::{fold_map::FoldMap, suggestion_map::SuggestionMap},
+        MultiBuffer,
+    };
    use rand::{prelude::StdRng, Rng};

-    #[test]
-    fn test_expand_tabs() {
-        assert_eq!(
-            TabSnapshot::expand_tabs("\t".chars(), 0, 4.try_into().unwrap()),
-            0
-        );
-        assert_eq!(
-            TabSnapshot::expand_tabs("\t".chars(), 1, 4.try_into().unwrap()),
-            4
-        );
-        assert_eq!(
-            TabSnapshot::expand_tabs("\ta".chars(), 2, 4.try_into().unwrap()),
-            5
-        );
+    #[gpui::test]
+    fn test_expand_tabs(cx: &mut gpui::AppContext) {
+        let buffer = MultiBuffer::build_simple("", cx);
+        let buffer_snapshot = buffer.read(cx).snapshot(cx);
+        let (_, fold_snapshot) = FoldMap::new(buffer_snapshot.clone());
+        let (_, suggestion_snapshot) = SuggestionMap::new(fold_snapshot);
+        let (_, tab_snapshot) = TabMap::new(suggestion_snapshot, 4.try_into().unwrap());
+
+        assert_eq!(tab_snapshot.expand_tabs("\t".chars(), 0), 0);
+        assert_eq!(tab_snapshot.expand_tabs("\t".chars(), 1), 4);
+        assert_eq!(tab_snapshot.expand_tabs("\ta".chars(), 2), 5);
+    }
+
+    #[gpui::test]
+    fn test_long_lines(cx: &mut gpui::AppContext) {
+        let max_expansion_column = 12;
+        let input = "A\tBC\tDEF\tG\tHI\tJ\tK\tL\tM";
+        let output = "A   BC  DEF G   HI J K L M";
+
+        let buffer = MultiBuffer::build_simple(input, cx);
+        let buffer_snapshot = buffer.read(cx).snapshot(cx);
+        let (_, fold_snapshot) = FoldMap::new(buffer_snapshot.clone());
+        let (_, suggestion_snapshot) = SuggestionMap::new(fold_snapshot);
+        let (_, mut tab_snapshot) = TabMap::new(suggestion_snapshot, 4.try_into().unwrap());
+
+        tab_snapshot.max_expansion_column = max_expansion_column;
+        assert_eq!(tab_snapshot.text(), output);
+
+        for (ix, c) in input.char_indices() {
+            assert_eq!(
+                tab_snapshot
+                    .chunks(
+                        TabPoint::new(0, ix as u32)..tab_snapshot.max_point(),
+                        false,
+                        None,
+                        None,
+                    )
+                    .map(|c| c.text)
+                    .collect::<String>(),
+                &output[ix..],
+                "text from index {ix}"
+            );
+
+            if c != '\t' {
+                let input_point = Point::new(0, ix as u32);
+                let output_point = Point::new(0, output.find(c).unwrap() as u32);
+                assert_eq!(
+                    tab_snapshot.to_tab_point(SuggestionPoint(input_point)),
+                    TabPoint(output_point),
+                    "to_tab_point({input_point:?})"
+                );
+                assert_eq!(
+                    tab_snapshot
+                        .to_suggestion_point(TabPoint(output_point), Bias::Left)
+                        .0,
+                    SuggestionPoint(input_point),
+                    "to_suggestion_point({output_point:?})"
+                );
+            }
+        }
+    }
+
+    #[gpui::test]
+    fn test_long_lines_with_character_spanning_max_expansion_column(cx: &mut gpui::AppContext) {
+        let max_expansion_column = 8;
+        let input = "abcdefg⋯hij";
+
+        let buffer = MultiBuffer::build_simple(input, cx);
+        let buffer_snapshot = buffer.read(cx).snapshot(cx);
+        let (_, fold_snapshot) = FoldMap::new(buffer_snapshot.clone());
+        let (_, suggestion_snapshot) = SuggestionMap::new(fold_snapshot);
+        let (_, mut tab_snapshot) = TabMap::new(suggestion_snapshot, 4.try_into().unwrap());
+
+        tab_snapshot.max_expansion_column = max_expansion_column;
+        assert_eq!(tab_snapshot.text(), input);
    }

    #[gpui::test(iterations = 100)]
-    fn test_random_tabs(cx: &mut gpui::MutableAppContext, mut rng: StdRng) {
+    fn test_random_tabs(cx: &mut gpui::AppContext, mut rng: StdRng) {
        let tab_size = NonZeroU32::new(rng.gen_range(1..=4)).unwrap();
        let len = rng.gen_range(0..30);
        let buffer = if rng.gen() {
@@ -518,10 +671,15 @@ mod tests {

        let (mut fold_map, _) = FoldMap::new(buffer_snapshot.clone());
        fold_map.randomly_mutate(&mut rng);
-        let (folds_snapshot, _) = fold_map.read(buffer_snapshot, vec![]);
-        log::info!("FoldMap text: {:?}", folds_snapshot.text());
+        let (fold_snapshot, _) = fold_map.read(buffer_snapshot, vec![]);
+        log::info!("FoldMap text: {:?}", fold_snapshot.text());
+        let (suggestion_map, _) = SuggestionMap::new(fold_snapshot);
+        let (suggestion_snapshot, _) = suggestion_map.randomly_mutate(&mut rng);
+        log::info!("SuggestionMap text: {:?}", suggestion_snapshot.text());
+
+        let (tab_map, _) = TabMap::new(suggestion_snapshot.clone(), tab_size);
+        let tabs_snapshot = tab_map.set_max_expansion_column(32);

-        let (_, tabs_snapshot) = TabMap::new(folds_snapshot.clone(), tab_size);
        let text = text::Rope::from(tabs_snapshot.text().as_str());
        log::info!(
            "TabMap text (tab size: {}): {:?}",
@@ -546,18 +704,18 @@ mod tests {
                .collect::<String>();
            let expected_summary = TextSummary::from(expected_text.as_str());
            assert_eq!(
-                expected_text,
                tabs_snapshot
-                    .chunks(start..end, false, None)
+                    .chunks(start..end, false, None, None)
                    .map(|c| c.text)
                    .collect::<String>(),
+                expected_text,
                "chunks({:?}..{:?})",
                start,
                end
            );

            let mut actual_summary = tabs_snapshot.text_summary_for_range(start..end);
-            if tab_size.get() > 1 && folds_snapshot.text().contains('\t') {
+            if tab_size.get() > 1 && suggestion_snapshot.text().contains('\t') {
                actual_summary.longest_row = expected_summary.longest_row;
                actual_summary.longest_row_chars = expected_summary.longest_row_chars;
            }
@@ -565,7 +723,11 @@ mod tests {
        }

        for row in 0..=text.max_point().row {
-            assert_eq!(tabs_snapshot.line_len(row), text.line_len(row));
+            assert_eq!(
+                tabs_snapshot.line_len(row),
+                text.line_len(row),
+                "line_len({row})"
+            );
        }
    }
 }
--- a/crates/editor/src/display_map/wrap_map.rs
+++ b/crates/editor/src/display_map/wrap_map.rs
@@ -1,12 +1,13 @@
 use super::{
-    fold_map,
+    suggestion_map::SuggestionBufferRows,
    tab_map::{self, TabEdit, TabPoint, TabSnapshot},
    TextHighlights,
 };
 use crate::MultiBufferSnapshot;
 use gpui::{
-    fonts::FontId, text_layout::LineWrapper, Entity, ModelContext, ModelHandle, MutableAppContext,
-    Task,
+    fonts::{FontId, HighlightStyle},
+    text_layout::LineWrapper,
+    AppContext, Entity, ModelContext, ModelHandle, Task,
 };
 use language::{Chunk, Point};
 use lazy_static::lazy_static;
@@ -64,7 +65,7 @@ pub struct WrapChunks<'a> {

 #[derive(Clone)]
 pub struct WrapBufferRows<'a> {
-    input_buffer_rows: fold_map::FoldBufferRows<'a>,
+    input_buffer_rows: SuggestionBufferRows<'a>,
    input_buffer_row: Option<u32>,
    output_row: u32,
    soft_wrapped: bool,
@@ -78,7 +79,7 @@ impl WrapMap {
        font_id: FontId,
        font_size: f32,
        wrap_width: Option<f32>,
-        cx: &mut MutableAppContext,
+        cx: &mut AppContext,
    ) -> (ModelHandle<Self>, WrapSnapshot) {
        let handle = cx.add_model(|cx| {
            let mut this = Self {
@@ -444,6 +445,7 @@ impl WrapSnapshot {
                    TabPoint::new(edit.new_rows.start, 0)..new_tab_snapshot.max_point(),
                    false,
                    None,
+                    None,
                );
                let mut edit_transforms = Vec::<Transform>::new();
                for _ in edit.new_rows.start..edit.new_rows.end {
@@ -573,6 +575,7 @@ impl WrapSnapshot {
        rows: Range<u32>,
        language_aware: bool,
        text_highlights: Option<&'a TextHighlights>,
+        suggestion_highlight: Option<HighlightStyle>,
    ) -> WrapChunks<'a> {
        let output_start = WrapPoint::new(rows.start, 0);
        let output_end = WrapPoint::new(rows.end, 0);
@@ -590,6 +593,7 @@ impl WrapSnapshot {
                input_start..input_end,
                language_aware,
                text_highlights,
+                suggestion_highlight,
            ),
            input_chunk: Default::default(),
            output_position: output_start,
@@ -755,16 +759,24 @@ impl WrapSnapshot {
            let text = language::Rope::from(self.text().as_str());
            let input_buffer_rows = self.buffer_snapshot().buffer_rows(0).collect::<Vec<_>>();
            let mut expected_buffer_rows = Vec::new();
-            let mut prev_tab_row = 0;
+            let mut prev_fold_row = 0;
            for display_row in 0..=self.max_point().row() {
                let tab_point = self.to_tab_point(WrapPoint::new(display_row, 0));
-                if tab_point.row() == prev_tab_row && display_row != 0 {
+                let suggestion_point = self
+                    .tab_snapshot
+                    .to_suggestion_point(tab_point, Bias::Left)
+                    .0;
+                let fold_point = self
+                    .tab_snapshot
+                    .suggestion_snapshot
+                    .to_fold_point(suggestion_point);
+                if fold_point.row() == prev_fold_row && display_row != 0 {
                    expected_buffer_rows.push(None);
                } else {
-                    let fold_point = self.tab_snapshot.to_fold_point(tab_point, Bias::Left).0;
-                    let buffer_point = fold_point.to_buffer_point(&self.tab_snapshot.fold_snapshot);
+                    let buffer_point = fold_point
+                        .to_buffer_point(&self.tab_snapshot.suggestion_snapshot.fold_snapshot);
                    expected_buffer_rows.push(input_buffer_rows[buffer_point.row as usize]);
-                    prev_tab_row = tab_point.row();
+                    prev_fold_row = fold_point.row();
                }

                assert_eq!(self.line_len(display_row), text.line_len(display_row));
@@ -1026,7 +1038,7 @@ fn consolidate_wrap_edits(edits: &mut Vec<WrapEdit>) {
 mod tests {
    use super::*;
    use crate::{
-        display_map::{fold_map::FoldMap, tab_map::TabMap},
+        display_map::{fold_map::FoldMap, suggestion_map::SuggestionMap, tab_map::TabMap},
        MultiBuffer,
    };
    use gpui::test::observe;
@@ -1053,7 +1065,9 @@ mod tests {
            Some(rng.gen_range(0.0..=1000.0))
        };
        let tab_size = NonZeroU32::new(rng.gen_range(1..=4)).unwrap();
-        let family_id = font_cache.load_family(&["Helvetica"]).unwrap();
+        let family_id = font_cache
+            .load_family(&["Helvetica"], &Default::default())
+            .unwrap();
        let font_id = font_cache
            .select_font(family_id, &Default::default())
            .unwrap();
@@ -1074,14 +1088,14 @@ mod tests {
            }
        });
        let mut buffer_snapshot = buffer.read_with(cx, |buffer, cx| buffer.snapshot(cx));
-        let (mut fold_map, folds_snapshot) = FoldMap::new(buffer_snapshot.clone());
-        let (tab_map, tabs_snapshot) = TabMap::new(folds_snapshot.clone(), tab_size);
-        log::info!("Unwrapped text (no folds): {:?}", buffer_snapshot.text());
-        log::info!(
-            "Unwrapped text (unexpanded tabs): {:?}",
-            folds_snapshot.text()
-        );
-        log::info!("Unwrapped text (expanded tabs): {:?}", tabs_snapshot.text());
+        log::info!("Buffer text: {:?}", buffer_snapshot.text());
+        let (mut fold_map, fold_snapshot) = FoldMap::new(buffer_snapshot.clone());
+        log::info!("FoldMap text: {:?}", fold_snapshot.text());
+        let (suggestion_map, suggestion_snapshot) = SuggestionMap::new(fold_snapshot.clone());
+        log::info!("SuggestionMap text: {:?}", suggestion_snapshot.text());
+        let (tab_map, _) = TabMap::new(suggestion_snapshot.clone(), tab_size);
+        let tabs_snapshot = tab_map.set_max_expansion_column(32);
+        log::info!("TabMap text: {:?}", tabs_snapshot.text());

        let mut line_wrapper = LineWrapper::new(font_id, font_size, font_system);
        let unwrapped_text = tabs_snapshot.text();
@@ -1124,9 +1138,11 @@ mod tests {
                    wrap_map.update(cx, |map, cx| map.set_wrap_width(wrap_width, cx));
                }
                20..=39 => {
-                    for (folds_snapshot, fold_edits) in fold_map.randomly_mutate(&mut rng) {
+                    for (fold_snapshot, fold_edits) in fold_map.randomly_mutate(&mut rng) {
+                        let (suggestion_snapshot, suggestion_edits) =
+                            suggestion_map.sync(fold_snapshot, fold_edits);
                        let (tabs_snapshot, tab_edits) =
-                            tab_map.sync(folds_snapshot, fold_edits, tab_size);
+                            tab_map.sync(suggestion_snapshot, suggestion_edits, tab_size);
                        let (mut snapshot, wrap_edits) =
                            wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot, tab_edits, cx));
                        snapshot.check_invariants();
@@ -1134,6 +1150,17 @@ mod tests {
                        edits.push((snapshot, wrap_edits));
                    }
                }
+                40..=59 => {
+                    let (suggestion_snapshot, suggestion_edits) =
+                        suggestion_map.randomly_mutate(&mut rng);
+                    let (tabs_snapshot, tab_edits) =
+                        tab_map.sync(suggestion_snapshot, suggestion_edits, tab_size);
+                    let (mut snapshot, wrap_edits) =
+                        wrap_map.update(cx, |map, cx| map.sync(tabs_snapshot, tab_edits, cx));
+                    snapshot.check_invariants();
+                    snapshot.verify_chunks(&mut rng);
+                    edits.push((snapshot, wrap_edits));
+                }
                _ => {
                    buffer.update(cx, |buffer, cx| {
                        let subscription = buffer.subscribe();
@@ -1145,14 +1172,15 @@ mod tests {
                }
            }

-            log::info!("Unwrapped text (no folds): {:?}", buffer_snapshot.text());
-            let (folds_snapshot, fold_edits) = fold_map.read(buffer_snapshot.clone(), buffer_edits);
-            log::info!(
-                "Unwrapped text (unexpanded tabs): {:?}",
-                folds_snapshot.text()
-            );
-            let (tabs_snapshot, tab_edits) = tab_map.sync(folds_snapshot, fold_edits, tab_size);
-            log::info!("Unwrapped text (expanded tabs): {:?}", tabs_snapshot.text());
+            log::info!("Buffer text: {:?}", buffer_snapshot.text());
+            let (fold_snapshot, fold_edits) = fold_map.read(buffer_snapshot.clone(), buffer_edits);
+            log::info!("FoldMap text: {:?}", fold_snapshot.text());
+            let (suggestion_snapshot, suggestion_edits) =
+                suggestion_map.sync(fold_snapshot, fold_edits);
+            log::info!("SuggestionMap text: {:?}", suggestion_snapshot.text());
+            let (tabs_snapshot, tab_edits) =
+                tab_map.sync(suggestion_snapshot, suggestion_edits, tab_size);
+            log::info!("TabMap text: {:?}", tabs_snapshot.text());

            let unwrapped_text = tabs_snapshot.text();
            let expected_text = wrap_text(&unwrapped_text, wrap_width, &mut line_wrapper);
@@ -1199,7 +1227,7 @@ mod tests {
                if tab_size.get() == 1
                    || !wrapped_snapshot
                        .tab_snapshot
-                        .fold_snapshot
+                        .suggestion_snapshot
                        .text()
                        .contains('\t')
                {
@@ -1292,7 +1320,7 @@ mod tests {
        }

        pub fn text_chunks(&self, wrap_row: u32) -> impl Iterator<Item = &str> {
-            self.chunks(wrap_row..self.max_point().row() + 1, false, None)
+            self.chunks(wrap_row..self.max_point().row() + 1, false, None, None)
                .map(|h| h.text)
        }

@@ -1316,7 +1344,7 @@ mod tests {
                }

                let actual_text = self
-                    .chunks(start_row..end_row, true, None)
+                    .chunks(start_row..end_row, true, None, None)
                    .map(|c| c.text)
                    .collect::<String>();
                assert_eq!(
--- a/crates/editor/src/editor.rs
+++ b/crates/editor/src/editor.rs
@@ -24,6 +24,7 @@ use anyhow::Result;
 use blink_manager::BlinkManager;
 use clock::ReplicaId;
 use collections::{BTreeMap, Bound, HashMap, HashSet, VecDeque};
+use copilot::Copilot;
 pub use display_map::DisplayPoint;
 use display_map::*;
 pub use element::*;
@@ -38,11 +39,10 @@ use gpui::{
    geometry::vector::Vector2F,
    impl_actions, impl_internal_actions,
    keymap_matcher::KeymapContext,
-    platform::CursorStyle,
-    serde_json::json,
+    platform::{CursorStyle, MouseButton},
+    serde_json::{self, json},
    AnyViewHandle, AppContext, AsyncAppContext, ClipboardItem, Element, ElementBox, Entity,
-    ModelHandle, MouseButton, MutableAppContext, RenderContext, Subscription, Task, View,
-    ViewContext, ViewHandle, WeakViewHandle,
+    ModelHandle, RenderContext, Subscription, Task, View, ViewContext, ViewHandle, WeakViewHandle,
 };
 use highlight_matching_bracket::refresh_matching_bracket_highlights;
 use hover_popover::{hide_hover, HideHover, HoverState};
@@ -52,7 +52,7 @@ pub use language::{char_kind, CharKind};
 use language::{
    AutoindentMode, BracketPair, Buffer, CodeAction, CodeLabel, Completion, CursorShape,
    Diagnostic, DiagnosticSeverity, IndentKind, IndentSize, Language, OffsetRangeExt, OffsetUtf16,
-    Point, Selection, SelectionGoal, TransactionId,
+    Point, Rope, Selection, SelectionGoal, TransactionId,
 };
 use link_go_to_definition::{
    hide_link_definition, show_link_definition, LinkDefinitionKind, LinkGoToDefinitionState,
@@ -94,6 +94,7 @@ const CURSOR_BLINK_INTERVAL: Duration = Duration::from_millis(500);
 const MAX_LINE_LEN: usize = 1024;
 const MIN_NAVIGATION_HISTORY_ROW_DELTA: i64 = 10;
 const MAX_SELECTION_HISTORY_LEN: usize = 1024;
+const COPILOT_DEBOUNCE_TIMEOUT: Duration = Duration::from_millis(75);

 pub const FORMAT_TIMEOUT: Duration = Duration::from_secs(2);

@@ -163,12 +164,12 @@ pub struct ToggleComments {

 #[derive(Clone, Default, Deserialize, PartialEq)]
 pub struct FoldAt {
-    pub display_row: u32,
+    pub buffer_row: u32,
 }

 #[derive(Clone, Default, Deserialize, PartialEq)]
 pub struct UnfoldAt {
-    pub display_row: u32,
+    pub buffer_row: u32,
 }

 #[derive(Clone, Default, Deserialize, PartialEq)]
@@ -258,7 +259,10 @@ actions!(
        Hover,
        Format,
        ToggleSoftWrap,
-        RevealInFinder
+        RevealInFinder,
+        CopyPath,
+        CopyRelativePath,
+        CopyHighlightJson
    ]
 );

@@ -292,7 +296,7 @@ pub enum Direction {
    Next,
 }

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(Editor::new_file);
    cx.add_action(Editor::select);
    cx.add_action(Editor::cancel);
@@ -378,6 +382,9 @@ pub fn init(cx: &mut MutableAppContext) {
    cx.add_action(Editor::jump);
    cx.add_action(Editor::toggle_soft_wrap);
    cx.add_action(Editor::reveal_in_finder);
+    cx.add_action(Editor::copy_path);
+    cx.add_action(Editor::copy_relative_path);
+    cx.add_action(Editor::copy_highlight_json);
    cx.add_async_action(Editor::format);
    cx.add_action(Editor::restart_language_server);
    cx.add_action(Editor::show_character_palette);
@@ -386,6 +393,8 @@ pub fn init(cx: &mut MutableAppContext) {
    cx.add_async_action(Editor::rename);
    cx.add_async_action(Editor::confirm_rename);
    cx.add_async_action(Editor::find_all_references);
+    cx.add_action(Editor::next_copilot_suggestion);
+    cx.add_action(Editor::previous_copilot_suggestion);

    hover_popover::init(cx);
    link_go_to_definition::init(cx);
@@ -504,6 +513,7 @@ pub struct Editor {
    hover_state: HoverState,
    gutter_hovered: bool,
    link_go_to_definition_state: LinkGoToDefinitionState,
+    copilot_state: CopilotState,
    _subscriptions: Vec<Subscription>,
 }

@@ -1001,6 +1011,80 @@ impl CodeActionsMenu {
    }
 }

+pub struct CopilotState {
+    excerpt_id: Option<ExcerptId>,
+    pending_refresh: Task<Option<()>>,
+    completions: Vec<copilot::Completion>,
+    active_completion_index: usize,
+}
+
+impl Default for CopilotState {
+    fn default() -> Self {
+        Self {
+            excerpt_id: None,
+            pending_refresh: Task::ready(Some(())),
+            completions: Default::default(),
+            active_completion_index: 0,
+        }
+    }
+}
+
+impl CopilotState {
+    fn text_for_active_completion(
+        &self,
+        cursor: Anchor,
+        buffer: &MultiBufferSnapshot,
+    ) -> Option<&str> {
+        use language::ToOffset as _;
+
+        let completion = self.completions.get(self.active_completion_index)?;
+        let excerpt_id = self.excerpt_id?;
+        let completion_buffer = buffer.buffer_for_excerpt(excerpt_id)?;
+        if excerpt_id != cursor.excerpt_id
+            || !completion.range.start.is_valid(completion_buffer)
+            || !completion.range.end.is_valid(completion_buffer)
+        {
+            return None;
+        }
+
+        let mut completion_range = completion.range.to_offset(&completion_buffer);
+        let prefix_len = Self::common_prefix(
+            completion_buffer.chars_for_range(completion_range.clone()),
+            completion.text.chars(),
+        );
+        completion_range.start += prefix_len;
+        let suffix_len = Self::common_prefix(
+            completion_buffer.reversed_chars_for_range(completion_range.clone()),
+            completion.text[prefix_len..].chars().rev(),
+        );
+        completion_range.end = completion_range.end.saturating_sub(suffix_len);
+
+        if completion_range.is_empty()
+            && completion_range.start == cursor.text_anchor.to_offset(&completion_buffer)
+        {
+            Some(&completion.text[prefix_len..completion.text.len() - suffix_len])
+        } else {
+            None
+        }
+    }
+
+    fn push_completion(&mut self, new_completion: copilot::Completion) {
+        for completion in &self.completions {
+            if *completion == new_completion {
+                return;
+            }
+        }
+        self.completions.push(new_completion);
+    }
+
+    fn common_prefix<T1: Iterator<Item = char>, T2: Iterator<Item = char>>(a: T1, b: T2) -> usize {
+        a.zip(b)
+            .take_while(|(a, b)| a == b)
+            .map(|(a, _)| a.len_utf8())
+            .sum()
+    }
+}
+
 #[derive(Debug)]
 struct ActiveDiagnosticGroup {
    primary_range: Range<Anchor>,
@@ -1174,12 +1258,14 @@ impl Editor {
            remote_id: None,
            hover_state: Default::default(),
            link_go_to_definition_state: Default::default(),
+            copilot_state: Default::default(),
            gutter_hovered: false,
            _subscriptions: vec![
                cx.observe(&buffer, Self::on_buffer_changed),
                cx.subscribe(&buffer, Self::on_buffer_event),
                cx.observe(&display_map, Self::on_display_map_changed),
                cx.observe(&blink_manager, |_, _, cx| cx.notify()),
+                cx.observe_global::<Settings, _>(Self::on_settings_changed),
            ],
        };
        this.end_selection(cx);
@@ -1232,7 +1318,7 @@ impl Editor {
        self.buffer().read(cx).title(cx)
    }

-    pub fn snapshot(&mut self, cx: &mut MutableAppContext) -> EditorSnapshot {
+    pub fn snapshot(&mut self, cx: &mut AppContext) -> EditorSnapshot {
        EditorSnapshot {
            mode: self.mode,
            display_snapshot: self.display_map.update(cx, |map, cx| map.snapshot(cx)),
@@ -1383,6 +1469,7 @@ impl Editor {
            self.refresh_code_actions(cx);
            self.refresh_document_highlights(cx);
            refresh_matching_bracket_highlights(self, cx);
+            self.hide_copilot_suggestion(cx);
        }

        self.blink_manager.update(cx, BlinkManager::pause_blinking);
@@ -1756,6 +1843,10 @@ impl Editor {
            return;
        }

+        if self.hide_copilot_suggestion(cx).is_some() {
+            return;
+        }
+
        if self.snippet_stack.pop().is_some() {
            return;
        }
@@ -1931,8 +2022,18 @@ impl Editor {
            }

            drop(snapshot);
+            let had_active_copilot_suggestion = this.has_active_copilot_suggestion(cx);
            this.change_selections(Some(Autoscroll::fit()), cx, |s| s.select(new_selections));
-            this.trigger_completion_on_input(&text, cx);
+
+            if had_active_copilot_suggestion {
+                this.refresh_copilot_suggestions(cx);
+                if !this.has_active_copilot_suggestion(cx) {
+                    this.trigger_completion_on_input(&text, cx);
+                }
+            } else {
+                this.trigger_completion_on_input(&text, cx);
+                this.refresh_copilot_suggestions(cx);
+            }
        });
    }

@@ -2013,6 +2114,7 @@ impl Editor {
                .collect();

            this.change_selections(Some(Autoscroll::fit()), cx, |s| s.select(new_selections));
+            this.refresh_copilot_suggestions(cx);
        });
    }

@@ -2059,6 +2161,21 @@ impl Editor {
    }

    pub fn insert(&mut self, text: &str, cx: &mut ViewContext<Self>) {
+        self.insert_with_autoindent_mode(
+            text,
+            Some(AutoindentMode::Block {
+                original_indent_columns: Vec::new(),
+            }),
+            cx,
+        );
+    }
+
+    fn insert_with_autoindent_mode(
+        &mut self,
+        text: &str,
+        autoindent_mode: Option<AutoindentMode>,
+        cx: &mut ViewContext<Self>,
+    ) {
        let text: Arc<str> = text.into();
        self.transact(cx, |this, cx| {
            let old_selections = this.selections.all_adjusted(cx);
@@ -2077,9 +2194,7 @@ impl Editor {
                    old_selections
                        .iter()
                        .map(|s| (s.start..s.end, text.clone())),
-                    Some(AutoindentMode::Block {
-                        original_indent_columns: Vec::new(),
-                    }),
+                    autoindent_mode,
                    cx,
                );
                anchors
@@ -2277,11 +2392,11 @@ impl Editor {
                        }

                        this.completion_tasks.retain(|(id, _)| *id > menu.id);
-                        if this.focused {
+                        if this.focused && !menu.matches.is_empty() {
                            this.show_context_menu(ContextMenu::Completions(menu), cx);
+                        } else if this.hide_context_menu(cx).is_none() {
+                            this.update_visible_copilot_suggestion(cx);
                        }
-
-                        cx.notify();
                    });
                }
                Ok::<_, anyhow::Error>(())
@@ -2383,6 +2498,8 @@ impl Editor {
                    );
                });
            }
+
+            this.refresh_copilot_suggestions(cx);
        });

        let project = self.project.clone()?;
@@ -2675,6 +2792,139 @@ impl Editor {
        None
    }

+    fn refresh_copilot_suggestions(&mut self, cx: &mut ViewContext<Self>) -> Option<()> {
+        let copilot = Copilot::global(cx)?;
+        if self.mode != EditorMode::Full || !copilot.read(cx).status().is_authorized() {
+            self.hide_copilot_suggestion(cx);
+            return None;
+        }
+        self.update_visible_copilot_suggestion(cx);
+
+        let snapshot = self.buffer.read(cx).snapshot(cx);
+        let cursor = self.selections.newest_anchor().head();
+        let language_name = snapshot.language_at(cursor).map(|language| language.name());
+        if !cx.global::<Settings>().copilot_on(language_name.as_deref()) {
+            self.hide_copilot_suggestion(cx);
+            return None;
+        }
+
+        let (buffer, buffer_position) =
+            self.buffer.read(cx).text_anchor_for_position(cursor, cx)?;
+        self.copilot_state.pending_refresh = cx.spawn_weak(|this, mut cx| async move {
+            cx.background().timer(COPILOT_DEBOUNCE_TIMEOUT).await;
+            let (completion, completions_cycling) = copilot.update(&mut cx, |copilot, cx| {
+                (
+                    copilot.completions(&buffer, buffer_position, cx),
+                    copilot.completions_cycling(&buffer, buffer_position, cx),
+                )
+            });
+
+            let (completion, completions_cycling) = futures::join!(completion, completions_cycling);
+            let mut completions = Vec::new();
+            completions.extend(completion.log_err().into_iter().flatten());
+            completions.extend(completions_cycling.log_err().into_iter().flatten());
+            this.upgrade(&cx)?.update(&mut cx, |this, cx| {
+                if !completions.is_empty() {
+                    this.copilot_state.completions.clear();
+                    this.copilot_state.active_completion_index = 0;
+                    this.copilot_state.excerpt_id = Some(cursor.excerpt_id);
+                    for completion in completions {
+                        this.copilot_state.push_completion(completion);
+                    }
+                    this.update_visible_copilot_suggestion(cx);
+                }
+            });
+
+            Some(())
+        });
+
+        Some(())
+    }
+
+    fn next_copilot_suggestion(&mut self, _: &copilot::NextSuggestion, cx: &mut ViewContext<Self>) {
+        if !self.has_active_copilot_suggestion(cx) {
+            self.refresh_copilot_suggestions(cx);
+            return;
+        }
+
+        self.copilot_state.active_completion_index =
+            (self.copilot_state.active_completion_index + 1) % self.copilot_state.completions.len();
+        self.update_visible_copilot_suggestion(cx);
+    }
+
+    fn previous_copilot_suggestion(
+        &mut self,
+        _: &copilot::PreviousSuggestion,
+        cx: &mut ViewContext<Self>,
+    ) {
+        if !self.has_active_copilot_suggestion(cx) {
+            self.refresh_copilot_suggestions(cx);
+            return;
+        }
+
+        self.copilot_state.active_completion_index =
+            if self.copilot_state.active_completion_index == 0 {
+                self.copilot_state.completions.len() - 1
+            } else {
+                self.copilot_state.active_completion_index - 1
+            };
+        self.update_visible_copilot_suggestion(cx);
+    }
+
+    fn accept_copilot_suggestion(&mut self, cx: &mut ViewContext<Self>) -> bool {
+        if let Some(text) = self.hide_copilot_suggestion(cx) {
+            self.insert_with_autoindent_mode(&text.to_string(), None, cx);
+            true
+        } else {
+            false
+        }
+    }
+
+    fn has_active_copilot_suggestion(&self, cx: &AppContext) -> bool {
+        self.display_map.read(cx).has_suggestion()
+    }
+
+    fn hide_copilot_suggestion(&mut self, cx: &mut ViewContext<Self>) -> Option<Rope> {
+        if self.has_active_copilot_suggestion(cx) {
+            let old_suggestion = self
+                .display_map
+                .update(cx, |map, cx| map.replace_suggestion::<usize>(None, cx));
+            cx.notify();
+            old_suggestion.map(|suggestion| suggestion.text)
+        } else {
+            None
+        }
+    }
+
+    fn update_visible_copilot_suggestion(&mut self, cx: &mut ViewContext<Self>) {
+        let snapshot = self.buffer.read(cx).snapshot(cx);
+        let selection = self.selections.newest_anchor();
+        let cursor = selection.head();
+
+        if self.context_menu.is_some()
+            || !self.completion_tasks.is_empty()
+            || selection.start != selection.end
+        {
+            self.hide_copilot_suggestion(cx);
+        } else if let Some(text) = self
+            .copilot_state
+            .text_for_active_completion(cursor, &snapshot)
+        {
+            self.display_map.update(cx, |map, cx| {
+                map.replace_suggestion(
+                    Some(Suggestion {
+                        position: cursor,
+                        text: text.into(),
+                    }),
+                    cx,
+                )
+            });
+            cx.notify();
+        } else {
+            self.hide_copilot_suggestion(cx);
+        }
+    }
+
    pub fn render_code_actions_indicator(
        &self,
        style: &EditorStyle,
@@ -2705,31 +2955,26 @@ impl Editor {

    pub fn render_fold_indicators(
        &self,
-        fold_data: Option<Vec<(u32, FoldStatus)>>,
-        active_rows: &BTreeMap<u32, bool>,
+        fold_data: Vec<Option<(FoldStatus, u32, bool)>>,
        style: &EditorStyle,
        gutter_hovered: bool,
        line_height: f32,
        gutter_margin: f32,
        cx: &mut RenderContext<Self>,
-    ) -> Option<Vec<(u32, ElementBox)>> {
+    ) -> Vec<Option<ElementBox>> {
        enum FoldIndicators {}

        let style = style.folds.clone();

-        fold_data.map(|fold_data| {
-            fold_data
-                .iter()
-                .copied()
-                .filter_map(|(fold_location, fold_status)| {
-                    (gutter_hovered
-                        || fold_status == FoldStatus::Folded
-                        || !*active_rows.get(&fold_location).unwrap_or(&true))
-                    .then(|| {
-                        (
-                            fold_location,
+        fold_data
+            .iter()
+            .enumerate()
+            .map(|(ix, fold_data)| {
+                fold_data
+                    .map(|(fold_status, buffer_row, active)| {
+                        (active || gutter_hovered || fold_status == FoldStatus::Folded).then(|| {
                            MouseEventHandler::<FoldIndicators>::new(
-                                fold_location as usize,
+                                ix as usize,
                                cx,
                                |mouse_state, _| -> ElementBox {
                                    Svg::new(match fold_status {
@@ -2760,21 +3005,17 @@ impl Editor {
                            .on_click(MouseButton::Left, {
                                move |_, cx| {
                                    cx.dispatch_any_action(match fold_status {
-                                        FoldStatus::Folded => Box::new(UnfoldAt {
-                                            display_row: fold_location,
-                                        }),
-                                        FoldStatus::Foldable => Box::new(FoldAt {
-                                            display_row: fold_location,
-                                        }),
+                                        FoldStatus::Folded => Box::new(UnfoldAt { buffer_row }),
+                                        FoldStatus::Foldable => Box::new(FoldAt { buffer_row }),
                                    });
                                }
                            })
-                            .boxed(),
-                        )
+                            .boxed()
+                        })
                    })
-                })
-                .collect()
-        })
+                    .flatten()
+            })
+            .collect()
    }

    pub fn context_menu_visible(&self) -> bool {
@@ -2799,13 +3040,18 @@ impl Editor {
            self.completion_tasks.clear();
        }
        self.context_menu = Some(menu);
+        self.hide_copilot_suggestion(cx);
        cx.notify();
    }

    fn hide_context_menu(&mut self, cx: &mut ViewContext<Self>) -> Option<ContextMenu> {
        cx.notify();
        self.completion_tasks.clear();
-        self.context_menu.take()
+        let context_menu = self.context_menu.take();
+        if context_menu.is_some() {
+            self.update_visible_copilot_suggestion(cx);
+        }
+        context_menu
    }

    pub fn insert_snippet(
@@ -2964,6 +3210,7 @@ impl Editor {

            this.change_selections(Some(Autoscroll::fit()), cx, |s| s.select(selections));
            this.insert("", cx);
+            this.refresh_copilot_suggestions(cx);
        });
    }

@@ -2979,6 +3226,7 @@ impl Editor {
                })
            });
            this.insert("", cx);
+            this.refresh_copilot_suggestions(cx);
        });
    }

@@ -3020,8 +3268,8 @@ impl Editor {
            // If the selection is empty and the cursor is in the leading whitespace before the
            // suggested indentation, then auto-indent the line.
            let cursor = selection.head();
+            let current_indent = snapshot.indent_size_for_line(cursor.row);
            if let Some(suggested_indent) = suggested_indents.get(&cursor.row).copied() {
-                let current_indent = snapshot.indent_size_for_line(cursor.row);
                if cursor.column < suggested_indent.len
                    && cursor.column <= current_indent.len
                    && current_indent.len <= suggested_indent.len
@@ -3040,6 +3288,16 @@ impl Editor {
                }
            }

+            // Accept copilot suggestion if there is only one selection and the cursor is not
+            // in the leading whitespace.
+            if self.selections.count() == 1
+                && cursor.column >= current_indent.len
+                && self.has_active_copilot_suggestion(cx)
+            {
+                self.accept_copilot_suggestion(cx);
+                return;
+            }
+
            // Otherwise, insert a hard or soft tab.
            let settings = cx.global::<Settings>();
            let language_name = buffer.language_at(cursor, cx).map(|l| l.name());
@@ -3063,7 +3321,8 @@ impl Editor {

        self.transact(cx, |this, cx| {
            this.buffer.update(cx, |b, cx| b.edit(edits, None, cx));
-            this.change_selections(Some(Autoscroll::fit()), cx, |s| s.select(selections))
+            this.change_selections(Some(Autoscroll::fit()), cx, |s| s.select(selections));
+            this.refresh_copilot_suggestions(cx);
        });
    }

@@ -3743,6 +4002,7 @@ impl Editor {
            }
            self.request_autoscroll(Autoscroll::fit(), cx);
            self.unmark_text(cx);
+            self.refresh_copilot_suggestions(cx);
            cx.emit(Event::Edited);
        }
    }
@@ -3757,6 +4017,7 @@ impl Editor {
            }
            self.request_autoscroll(Autoscroll::fit(), cx);
            self.unmark_text(cx);
+            self.refresh_copilot_suggestions(cx);
            cx.emit(Event::Edited);
        }
    }
@@ -5428,7 +5689,7 @@ impl Editor {
                            render: Arc::new({
                                let editor = rename_editor.clone();
                                move |cx: &mut BlockContext| {
-                                    ChildView::new(editor.clone(), cx)
+                                    ChildView::new(&editor, cx)
                                        .contained()
                                        .with_padding_left(cx.anchor_x)
                                        .boxed()
@@ -5759,18 +6020,16 @@ impl Editor {

        let selections = self.selections.all::<Point>(cx);
        for selection in selections {
-            let range = selection.display_range(&display_map).sorted();
-            let buffer_start_row = range.start.to_point(&display_map).row;
+            let range = selection.range().sorted();
+            let buffer_start_row = range.start.row;

-            for row in (0..=range.end.row()).rev() {
-                let fold_range = display_map.foldable_range(row).map(|range| {
-                    range.start.to_point(&display_map)..range.end.to_point(&display_map)
-                });
+            for row in (0..=range.end.row).rev() {
+                let fold_range = display_map.foldable_range(row);

                if let Some(fold_range) = fold_range {
                    if fold_range.end.row >= buffer_start_row {
                        fold_ranges.push(fold_range);
-                        if row <= range.start.row() {
+                        if row <= range.start.row {
                            break;
                        }
                    }
@@ -5782,19 +6041,15 @@ impl Editor {
    }

    pub fn fold_at(&mut self, fold_at: &FoldAt, cx: &mut ViewContext<Self>) {
-        let display_row = fold_at.display_row;
-
+        let buffer_row = fold_at.buffer_row;
        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));

-        if let Some(fold_range) = display_map.foldable_range(display_row) {
+        if let Some(fold_range) = display_map.foldable_range(buffer_row) {
            let autoscroll = self
                .selections
                .all::<Point>(cx)
                .iter()
-                .any(|selection| fold_range.overlaps(&selection.display_range(&display_map)));
-
-            let fold_range =
-                fold_range.start.to_point(&display_map)..fold_range.end.to_point(&display_map);
+                .any(|selection| fold_range.overlaps(&selection.range()));

            self.fold_ranges(std::iter::once(fold_range), autoscroll, cx);
        }
@@ -5822,25 +6077,19 @@ impl Editor {
    pub fn unfold_at(&mut self, unfold_at: &UnfoldAt, cx: &mut ViewContext<Self>) {
        let display_map = self.display_map.update(cx, |map, cx| map.snapshot(cx));

-        let intersection_range = DisplayPoint::new(unfold_at.display_row, 0)
-            ..DisplayPoint::new(
-                unfold_at.display_row,
-                display_map.line_len(unfold_at.display_row),
+        let intersection_range = Point::new(unfold_at.buffer_row, 0)
+            ..Point::new(
+                unfold_at.buffer_row,
+                display_map.buffer_snapshot.line_len(unfold_at.buffer_row),
            );

-        let autoscroll =
-            self.selections.all::<Point>(cx).iter().any(|selection| {
-                intersection_range.overlaps(&selection.display_range(&display_map))
-            });
+        let autoscroll = self
+            .selections
+            .all::<Point>(cx)
+            .iter()
+            .any(|selection| selection.range().overlaps(&intersection_range));

-        let display_point = DisplayPoint::new(unfold_at.display_row, 0).to_point(&display_map);
-
-        let mut point_range = display_point..display_point;
-
-        point_range.start.column = 0;
-        point_range.end.column = display_map.buffer_snapshot.line_len(point_range.end.row);
-
-        self.unfold_ranges(std::iter::once(point_range), true, autoscroll, cx)
+        self.unfold_ranges(std::iter::once(intersection_range), true, autoscroll, cx)
    }

    pub fn fold_selected_ranges(&mut self, _: &FoldSelectedRanges, cx: &mut ViewContext<Self>) {
@@ -5923,13 +6172,13 @@ impl Editor {
        });
    }

-    pub fn longest_row(&self, cx: &mut MutableAppContext) -> u32 {
+    pub fn longest_row(&self, cx: &mut AppContext) -> u32 {
        self.display_map
            .update(cx, |map, cx| map.snapshot(cx))
            .longest_row()
    }

-    pub fn max_point(&self, cx: &mut MutableAppContext) -> DisplayPoint {
+    pub fn max_point(&self, cx: &mut AppContext) -> DisplayPoint {
        self.display_map
            .update(cx, |map, cx| map.snapshot(cx))
            .max_point()
@@ -5949,7 +6198,7 @@ impl Editor {
        });
    }

-    pub fn display_text(&self, cx: &mut MutableAppContext) -> String {
+    pub fn display_text(&self, cx: &mut AppContext) -> String {
        self.display_map
            .update(cx, |map, cx| map.snapshot(cx))
            .text()
@@ -5981,7 +6230,7 @@ impl Editor {
        cx.notify();
    }

-    pub fn set_wrap_width(&self, width: Option<f32>, cx: &mut MutableAppContext) -> bool {
+    pub fn set_wrap_width(&self, width: Option<f32>, cx: &mut AppContext) -> bool {
        self.display_map
            .update(cx, |map, cx| map.set_wrap_width(width, cx))
    }
@@ -6007,6 +6256,26 @@ impl Editor {
        }
    }

+    pub fn copy_path(&mut self, _: &CopyPath, cx: &mut ViewContext<Self>) {
+        if let Some(buffer) = self.buffer().read(cx).as_singleton() {
+            if let Some(file) = buffer.read(cx).file().and_then(|f| f.as_local()) {
+                if let Some(path) = file.abs_path(cx).to_str() {
+                    cx.write_to_clipboard(ClipboardItem::new(path.to_string()));
+                }
+            }
+        }
+    }
+
+    pub fn copy_relative_path(&mut self, _: &CopyRelativePath, cx: &mut ViewContext<Self>) {
+        if let Some(buffer) = self.buffer().read(cx).as_singleton() {
+            if let Some(file) = buffer.read(cx).file().and_then(|f| f.as_local()) {
+                if let Some(path) = file.path().to_str() {
+                    cx.write_to_clipboard(ClipboardItem::new(path.to_string()));
+                }
+            }
+        }
+    }
+
    pub fn highlight_rows(&mut self, rows: Option<Range<u32>>) {
        self.highlighted_rows = rows;
    }
@@ -6176,6 +6445,9 @@ impl Editor {
            multi_buffer::Event::Edited => {
                self.refresh_active_diagnostics(cx);
                self.refresh_code_actions(cx);
+                if self.has_active_copilot_suggestion(cx) {
+                    self.update_visible_copilot_suggestion(cx);
+                }
                cx.emit(Event::BufferEdited);
            }
            multi_buffer::Event::ExcerptsAdded {
@@ -6206,6 +6478,10 @@ impl Editor {
        cx.notify();
    }

+    fn on_settings_changed(&mut self, cx: &mut ViewContext<Self>) {
+        self.refresh_copilot_suggestions(cx);
+    }
+
    pub fn set_searchable(&mut self, searchable: bool) {
        self.searchable = searchable;
    }
@@ -6344,16 +6620,85 @@ impl Editor {
                .as_singleton()
                .and_then(|b| b.read(cx).file()),
        ) {
+            let settings = cx.global::<Settings>();
+
            let extension = Path::new(file.file_name(cx))
                .extension()
                .and_then(|e| e.to_str());
            project.read(cx).client().report_event(
                name,
-                json!({ "File Extension": extension }),
-                cx.global::<Settings>().telemetry(),
+                json!({ "File Extension": extension, "Vim Mode": settings.vim_mode  }),
+                settings.telemetry(),
            );
        }
    }
+
+    /// Copy the highlighted chunks to the clipboard as JSON. The format is an array of lines,
+    /// with each line being an array of {text, highlight} objects.
+    fn copy_highlight_json(&mut self, _: &CopyHighlightJson, cx: &mut ViewContext<Self>) {
+        let Some(buffer) = self.buffer.read(cx).as_singleton() else {
+            return;
+        };
+
+        #[derive(Serialize)]
+        struct Chunk<'a> {
+            text: String,
+            highlight: Option<&'a str>,
+        }
+
+        let snapshot = buffer.read(cx).snapshot();
+        let range = self
+            .selected_text_range(cx)
+            .and_then(|selected_range| {
+                if selected_range.is_empty() {
+                    None
+                } else {
+                    Some(selected_range)
+                }
+            })
+            .unwrap_or_else(|| 0..snapshot.len());
+
+        let chunks = snapshot.chunks(range, true);
+        let mut lines = Vec::new();
+        let mut line: VecDeque<Chunk> = VecDeque::new();
+
+        let theme = &cx.global::<Settings>().theme.editor.syntax;
+
+        for chunk in chunks {
+            let highlight = chunk.syntax_highlight_id.and_then(|id| id.name(theme));
+            let mut chunk_lines = chunk.text.split("\n").peekable();
+            while let Some(text) = chunk_lines.next() {
+                let mut merged_with_last_token = false;
+                if let Some(last_token) = line.back_mut() {
+                    if last_token.highlight == highlight {
+                        last_token.text.push_str(text);
+                        merged_with_last_token = true;
+                    }
+                }
+
+                if !merged_with_last_token {
+                    line.push_back(Chunk {
+                        text: text.into(),
+                        highlight,
+                    });
+                }
+
+                if chunk_lines.peek().is_some() {
+                    if line.len() > 1 && line.front().unwrap().text.is_empty() {
+                        line.pop_front();
+                    }
+                    if line.len() > 1 && line.back().unwrap().text.is_empty() {
+                        line.pop_back();
+                    }
+
+                    lines.push(mem::take(&mut line));
+                }
+            }
+        }
+
+        let Some(lines) = serde_json::to_string_pretty(&lines).log_err() else { return; };
+        cx.write_to_clipboard(ClipboardItem::new(lines));
+    }
 }

 fn consume_contiguous_rows(
@@ -6447,7 +6792,7 @@ pub struct EditorReleased(pub WeakViewHandle<Editor>);
 impl Entity for Editor {
    type Event = Event;

-    fn release(&mut self, cx: &mut MutableAppContext) {
+    fn release(&mut self, cx: &mut AppContext) {
        cx.emit_global(EditorReleased(self.handle.clone()));
    }
 }
@@ -6523,7 +6868,7 @@ impl View for Editor {

    fn modifiers_changed(
        &mut self,
-        event: &gpui::ModifiersChangedEvent,
+        event: &gpui::platform::ModifiersChangedEvent,
        cx: &mut ViewContext<Self>,
    ) -> bool {
        let pending_selection = self.has_pending_selection();
--- a/crates/editor/src/editor_tests.rs
+++ b/crates/editor/src/editor_tests.rs
@@ -16,7 +16,7 @@ use language::{BracketPairConfig, FakeLspAdapter, LanguageConfig, LanguageRegist
 use parking_lot::Mutex;
 use project::FakeFs;
 use settings::EditorSettings;
-use std::{cell::RefCell, rc::Rc, time::Instant};
+use std::{cell::RefCell, future::Future, rc::Rc, time::Instant};
 use unindent::Unindent;
 use util::{
    assert_set_eq,
@@ -28,7 +28,7 @@ use workspace::{
 };

 #[gpui::test]
-fn test_edit_events(cx: &mut MutableAppContext) {
+fn test_edit_events(cx: &mut AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = cx.add_model(|cx| {
        let mut buffer = language::Buffer::new(0, "123456", cx);
@@ -155,7 +155,7 @@ fn test_edit_events(cx: &mut MutableAppContext) {
 }

 #[gpui::test]
-fn test_undo_redo_with_selection_restoration(cx: &mut MutableAppContext) {
+fn test_undo_redo_with_selection_restoration(cx: &mut AppContext) {
    cx.set_global(Settings::test(cx));
    let mut now = Instant::now();
    let buffer = cx.add_model(|cx| language::Buffer::new(0, "123456", cx));
@@ -225,7 +225,7 @@ fn test_undo_redo_with_selection_restoration(cx: &mut MutableAppContext) {
 }

 #[gpui::test]
-fn test_ime_composition(cx: &mut MutableAppContext) {
+fn test_ime_composition(cx: &mut AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = cx.add_model(|cx| {
        let mut buffer = language::Buffer::new(0, "abcde", cx);
@@ -327,7 +327,7 @@ fn test_ime_composition(cx: &mut MutableAppContext) {
 }

 #[gpui::test]
-fn test_selection_with_mouse(cx: &mut gpui::MutableAppContext) {
+fn test_selection_with_mouse(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));

    let buffer = MultiBuffer::build_simple("aaaaaa\nbbbbbb\ncccccc\nddddddd\n", cx);
@@ -392,7 +392,7 @@ fn test_selection_with_mouse(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_canceling_pending_selection(cx: &mut gpui::MutableAppContext) {
+fn test_canceling_pending_selection(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("aaaaaa\nbbbbbb\ncccccc\ndddddd\n", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -424,7 +424,7 @@ fn test_canceling_pending_selection(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_clone(cx: &mut gpui::MutableAppContext) {
+fn test_clone(cx: &mut gpui::AppContext) {
    let (text, selection_ranges) = marked_text_ranges(
        indoc! {"
            one
@@ -480,7 +480,7 @@ fn test_clone(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_navigation_history(cx: &mut gpui::MutableAppContext) {
+fn test_navigation_history(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    cx.set_global(DragAndDrop::<Workspace>::default());
    use workspace::item::Item;
@@ -492,7 +492,7 @@ fn test_navigation_history(cx: &mut gpui::MutableAppContext) {
        let handle = cx.handle();
        editor.set_nav_history(Some(pane.read(cx).nav_history_for_item(&handle)));

-        fn pop_history(editor: &mut Editor, cx: &mut MutableAppContext) -> Option<NavigationEntry> {
+        fn pop_history(editor: &mut Editor, cx: &mut AppContext) -> Option<NavigationEntry> {
            editor.nav_history.as_mut().unwrap().pop_backward(cx)
        }

@@ -590,7 +590,7 @@ fn test_navigation_history(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_cancel(cx: &mut gpui::MutableAppContext) {
+fn test_cancel(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("aaaaaa\nbbbbbb\ncccccc\ndddddd\n", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -630,7 +630,7 @@ fn test_cancel(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_fold(cx: &mut gpui::MutableAppContext) {
+fn test_fold_action(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple(
        &"
@@ -717,7 +717,7 @@ fn test_fold(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_move_cursor(cx: &mut gpui::MutableAppContext) {
+fn test_move_cursor(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer.clone(), cx));
@@ -793,7 +793,7 @@ fn test_move_cursor(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_move_cursor_multibyte(cx: &mut gpui::MutableAppContext) {
+fn test_move_cursor_multibyte(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("ⓐⓑⓒⓓⓔ\nabcde\nαβγδε\n", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer.clone(), cx));
@@ -895,7 +895,7 @@ fn test_move_cursor_multibyte(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_move_cursor_different_line_lengths(cx: &mut gpui::MutableAppContext) {
+fn test_move_cursor_different_line_lengths(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("ⓐⓑⓒⓓⓔ\nabcd\nαβγ\nabcd\nⓐⓑⓒⓓⓔ\n", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer.clone(), cx));
@@ -942,7 +942,7 @@ fn test_move_cursor_different_line_lengths(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_beginning_end_of_line(cx: &mut gpui::MutableAppContext) {
+fn test_beginning_end_of_line(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("abc\n  def", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -1102,7 +1102,7 @@ fn test_beginning_end_of_line(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_prev_next_word_boundary(cx: &mut gpui::MutableAppContext) {
+fn test_prev_next_word_boundary(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("use std::str::{foo, bar}\n\n  {baz.qux()}", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -1151,7 +1151,7 @@ fn test_prev_next_word_boundary(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_prev_next_word_bounds_with_soft_wrap(cx: &mut gpui::MutableAppContext) {
+fn test_prev_next_word_bounds_with_soft_wrap(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("use one::{\n    two::three::four::five\n};", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -1330,7 +1330,7 @@ async fn test_delete_to_beginning_of_line(cx: &mut gpui::TestAppContext) {
 }

 #[gpui::test]
-fn test_delete_to_word_boundary(cx: &mut gpui::MutableAppContext) {
+fn test_delete_to_word_boundary(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("one two three four", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer.clone(), cx));
@@ -1365,7 +1365,7 @@ fn test_delete_to_word_boundary(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_newline(cx: &mut gpui::MutableAppContext) {
+fn test_newline(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("aaaa\n    bbbb\n", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer.clone(), cx));
@@ -1385,7 +1385,7 @@ fn test_newline(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_newline_with_old_selections(cx: &mut gpui::MutableAppContext) {
+fn test_newline_with_old_selections(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple(
        "
@@ -1517,7 +1517,7 @@ async fn test_newline_below(cx: &mut gpui::TestAppContext) {
 }

 #[gpui::test]
-fn test_insert_with_old_selections(cx: &mut gpui::MutableAppContext) {
+fn test_insert_with_old_selections(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("a( X ), b( Y ), c( Z )", cx);
    let (_, editor) = cx.add_window(Default::default(), |cx| {
@@ -1836,7 +1836,7 @@ async fn test_indent_outdent_with_hard_tabs(cx: &mut gpui::TestAppContext) {
 }

 #[gpui::test]
-fn test_indent_outdent_with_excerpts(cx: &mut gpui::MutableAppContext) {
+fn test_indent_outdent_with_excerpts(cx: &mut gpui::AppContext) {
    cx.set_global(
        Settings::test(cx)
            .with_language_defaults(
@@ -2022,7 +2022,7 @@ async fn test_delete(cx: &mut gpui::TestAppContext) {
 }

 #[gpui::test]
-fn test_delete_line(cx: &mut gpui::MutableAppContext) {
+fn test_delete_line(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("abc\ndef\nghi\n", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -2062,7 +2062,7 @@ fn test_delete_line(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_duplicate_line(cx: &mut gpui::MutableAppContext) {
+fn test_duplicate_line(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("abc\ndef\nghi\n", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -2110,7 +2110,7 @@ fn test_duplicate_line(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_move_line_up_down(cx: &mut gpui::MutableAppContext) {
+fn test_move_line_up_down(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple(&sample_text(10, 5, 'a'), cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -2206,7 +2206,7 @@ fn test_move_line_up_down(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_move_line_up_down_with_blocks(cx: &mut gpui::MutableAppContext) {
+fn test_move_line_up_down_with_blocks(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple(&sample_text(10, 5, 'a'), cx);
    let snapshot = buffer.read(cx).snapshot(cx);
@@ -2230,7 +2230,7 @@ fn test_move_line_up_down_with_blocks(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_transpose(cx: &mut gpui::MutableAppContext) {
+fn test_transpose(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));

    _ = cx
@@ -2524,7 +2524,7 @@ async fn test_paste_multiline(cx: &mut gpui::TestAppContext) {
 }

 #[gpui::test]
-fn test_select_all(cx: &mut gpui::MutableAppContext) {
+fn test_select_all(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("abc\nde\nfgh", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -2538,7 +2538,7 @@ fn test_select_all(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_select_line(cx: &mut gpui::MutableAppContext) {
+fn test_select_line(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple(&sample_text(6, 5, 'a'), cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -2582,7 +2582,7 @@ fn test_select_line(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_split_selection_into_lines(cx: &mut gpui::MutableAppContext) {
+fn test_split_selection_into_lines(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple(&sample_text(9, 5, 'a'), cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -2650,7 +2650,7 @@ fn test_split_selection_into_lines(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_add_selection_above_below(cx: &mut gpui::MutableAppContext) {
+fn test_add_selection_above_below(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple("abc\ndefghi\n\njk\nlmno\n", cx);
    let (_, view) = cx.add_window(Default::default(), |cx| build_editor(buffer, cx));
@@ -4585,81 +4585,6 @@ async fn test_completion(cx: &mut gpui::TestAppContext) {
    cx.assert_editor_state("editor.closeˇ");
    handle_resolve_completion_request(&mut cx, None).await;
    apply_additional_edits.await.unwrap();
-
-    // Handle completion request passing a marked string specifying where the completion
-    // should be triggered from using '|' character, what range should be replaced, and what completions
-    // should be returned using '<' and '>' to delimit the range
-    async fn handle_completion_request<'a>(
-        cx: &mut EditorLspTestContext<'a>,
-        marked_string: &str,
-        completions: Vec<&'static str>,
-    ) {
-        let complete_from_marker: TextRangeMarker = '|'.into();
-        let replace_range_marker: TextRangeMarker = ('<', '>').into();
-        let (_, mut marked_ranges) = marked_text_ranges_by(
-            marked_string,
-            vec![complete_from_marker.clone(), replace_range_marker.clone()],
-        );
-
-        let complete_from_position =
-            cx.to_lsp(marked_ranges.remove(&complete_from_marker).unwrap()[0].start);
-        let replace_range =
-            cx.to_lsp_range(marked_ranges.remove(&replace_range_marker).unwrap()[0].clone());
-
-        cx.handle_request::<lsp::request::Completion, _, _>(move |url, params, _| {
-            let completions = completions.clone();
-            async move {
-                assert_eq!(params.text_document_position.text_document.uri, url.clone());
-                assert_eq!(
-                    params.text_document_position.position,
-                    complete_from_position
-                );
-                Ok(Some(lsp::CompletionResponse::Array(
-                    completions
-                        .iter()
-                        .map(|completion_text| lsp::CompletionItem {
-                            label: completion_text.to_string(),
-                            text_edit: Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
-                                range: replace_range,
-                                new_text: completion_text.to_string(),
-                            })),
-                            ..Default::default()
-                        })
-                        .collect(),
-                )))
-            }
-        })
-        .next()
-        .await;
-    }
-
-    async fn handle_resolve_completion_request<'a>(
-        cx: &mut EditorLspTestContext<'a>,
-        edits: Option<Vec<(&'static str, &'static str)>>,
-    ) {
-        let edits = edits.map(|edits| {
-            edits
-                .iter()
-                .map(|(marked_string, new_text)| {
-                    let (_, marked_ranges) = marked_text_ranges(marked_string, false);
-                    let replace_range = cx.to_lsp_range(marked_ranges[0].clone());
-                    lsp::TextEdit::new(replace_range, new_text.to_string())
-                })
-                .collect::<Vec<_>>()
-        });
-
-        cx.handle_request::<lsp::request::ResolveCompletionItem, _, _>(move |_, _, _| {
-            let edits = edits.clone();
-            async move {
-                Ok(lsp::CompletionItem {
-                    additional_text_edits: edits,
-                    ..Default::default()
-                })
-            }
-        })
-        .next()
-        .await;
-    }
 }

 #[gpui::test]
@@ -5003,7 +4928,7 @@ async fn test_toggle_block_comment(cx: &mut gpui::TestAppContext) {
 }

 #[gpui::test]
-fn test_editing_disjoint_excerpts(cx: &mut gpui::MutableAppContext) {
+fn test_editing_disjoint_excerpts(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(3, 4, 'a'), cx));
    let multibuffer = cx.add_model(|cx| {
@@ -5050,7 +4975,7 @@ fn test_editing_disjoint_excerpts(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_editing_overlapping_excerpts(cx: &mut gpui::MutableAppContext) {
+fn test_editing_overlapping_excerpts(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let markers = vec![('[', ']').into(), ('(', ')').into()];
    let (initial_text, mut excerpt_ranges) = marked_text_ranges_by(
@@ -5123,7 +5048,7 @@ fn test_editing_overlapping_excerpts(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_refresh_selections(cx: &mut gpui::MutableAppContext) {
+fn test_refresh_selections(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(3, 4, 'a'), cx));
    let mut excerpt1_id = None;
@@ -5209,7 +5134,7 @@ fn test_refresh_selections(cx: &mut gpui::MutableAppContext) {
 }

 #[gpui::test]
-fn test_refresh_selections_while_selecting_with_mouse(cx: &mut gpui::MutableAppContext) {
+fn test_refresh_selections_while_selecting_with_mouse(cx: &mut gpui::AppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(3, 4, 'a'), cx));
    let mut excerpt1_id = None;
@@ -5342,7 +5267,7 @@ async fn test_extra_newline_insertion(cx: &mut gpui::TestAppContext) {
 }

 #[gpui::test]
-fn test_highlighted_ranges(cx: &mut gpui::MutableAppContext) {
+fn test_highlighted_ranges(cx: &mut gpui::AppContext) {
    let buffer = MultiBuffer::build_simple(&sample_text(16, 8, 'a'), cx);

    cx.set_global(Settings::test(cx));
@@ -5956,6 +5881,392 @@ async fn test_move_to_enclosing_bracket(cx: &mut gpui::TestAppContext) {
    );
 }

+#[gpui::test(iterations = 10)]
+async fn test_copilot(deterministic: Arc<Deterministic>, cx: &mut gpui::TestAppContext) {
+    let (copilot, copilot_lsp) = Copilot::fake(cx);
+    cx.update(|cx| cx.set_global(copilot));
+    let mut cx = EditorLspTestContext::new_rust(
+        lsp::ServerCapabilities {
+            completion_provider: Some(lsp::CompletionOptions {
+                trigger_characters: Some(vec![".".to_string(), ":".to_string()]),
+                ..Default::default()
+            }),
+            ..Default::default()
+        },
+        cx,
+    )
+    .await;
+
+    cx.set_state(indoc! {"
+        oneˇ
+        two
+        three
+    "});
+
+    // When inserting, ensure autocompletion is favored over Copilot suggestions.
+    cx.simulate_keystroke(".");
+    let _ = handle_completion_request(
+        &mut cx,
+        indoc! {"
+            one.|<>
+            two
+            three
+        "},
+        vec!["completion_a", "completion_b"],
+    );
+    handle_copilot_completion_request(
+        &copilot_lsp,
+        vec![copilot::request::Completion {
+            text: "copilot1".into(),
+            range: lsp::Range::new(lsp::Position::new(0, 0), lsp::Position::new(0, 5)),
+            ..Default::default()
+        }],
+        vec![],
+    );
+    deterministic.advance_clock(COPILOT_DEBOUNCE_TIMEOUT);
+    cx.update_editor(|editor, cx| {
+        assert!(editor.context_menu_visible());
+        assert!(!editor.has_active_copilot_suggestion(cx));
+
+        // Confirming a completion inserts it and hides the context menu, without showing
+        // the copilot suggestion afterwards.
+        editor
+            .confirm_completion(&Default::default(), cx)
+            .unwrap()
+            .detach();
+        assert!(!editor.context_menu_visible());
+        assert!(!editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.text(cx), "one.completion_a\ntwo\nthree\n");
+        assert_eq!(editor.display_text(cx), "one.completion_a\ntwo\nthree\n");
+    });
+
+    cx.set_state(indoc! {"
+        oneˇ
+        two
+        three
+    "});
+
+    // When inserting, ensure autocompletion is favored over Copilot suggestions.
+    cx.simulate_keystroke(".");
+    let _ = handle_completion_request(
+        &mut cx,
+        indoc! {"
+            one.|<>
+            two
+            three
+        "},
+        vec!["completion_a", "completion_b"],
+    );
+    handle_copilot_completion_request(
+        &copilot_lsp,
+        vec![copilot::request::Completion {
+            text: "one.copilot1".into(),
+            range: lsp::Range::new(lsp::Position::new(0, 0), lsp::Position::new(0, 4)),
+            ..Default::default()
+        }],
+        vec![],
+    );
+    deterministic.advance_clock(COPILOT_DEBOUNCE_TIMEOUT);
+    cx.update_editor(|editor, cx| {
+        assert!(editor.context_menu_visible());
+        assert!(!editor.has_active_copilot_suggestion(cx));
+
+        // When hiding the context menu, the Copilot suggestion becomes visible.
+        editor.hide_context_menu(cx);
+        assert!(!editor.context_menu_visible());
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one.copilot1\ntwo\nthree\n");
+        assert_eq!(editor.text(cx), "one.\ntwo\nthree\n");
+    });
+
+    // Ensure existing completion is interpolated when inserting again.
+    cx.simulate_keystroke("c");
+    deterministic.run_until_parked();
+    cx.update_editor(|editor, cx| {
+        assert!(!editor.context_menu_visible());
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one.copilot1\ntwo\nthree\n");
+        assert_eq!(editor.text(cx), "one.c\ntwo\nthree\n");
+    });
+
+    // After debouncing, new Copilot completions should be requested.
+    handle_copilot_completion_request(
+        &copilot_lsp,
+        vec![copilot::request::Completion {
+            text: "one.copilot2".into(),
+            range: lsp::Range::new(lsp::Position::new(0, 0), lsp::Position::new(0, 5)),
+            ..Default::default()
+        }],
+        vec![],
+    );
+    deterministic.advance_clock(COPILOT_DEBOUNCE_TIMEOUT);
+    cx.update_editor(|editor, cx| {
+        assert!(!editor.context_menu_visible());
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one.copilot2\ntwo\nthree\n");
+        assert_eq!(editor.text(cx), "one.c\ntwo\nthree\n");
+
+        // Canceling should remove the active Copilot suggestion.
+        editor.cancel(&Default::default(), cx);
+        assert!(!editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one.c\ntwo\nthree\n");
+        assert_eq!(editor.text(cx), "one.c\ntwo\nthree\n");
+
+        // After canceling, tabbing shouldn't insert the previously shown suggestion.
+        editor.tab(&Default::default(), cx);
+        assert!(!editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one.c   \ntwo\nthree\n");
+        assert_eq!(editor.text(cx), "one.c   \ntwo\nthree\n");
+
+        // When undoing the previously active suggestion is shown again.
+        editor.undo(&Default::default(), cx);
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one.copilot2\ntwo\nthree\n");
+        assert_eq!(editor.text(cx), "one.c\ntwo\nthree\n");
+    });
+
+    // If an edit occurs outside of this editor, the suggestion is still correctly interpolated.
+    cx.update_buffer(|buffer, cx| buffer.edit([(5..5, "o")], None, cx));
+    cx.update_editor(|editor, cx| {
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one.copilot2\ntwo\nthree\n");
+        assert_eq!(editor.text(cx), "one.co\ntwo\nthree\n");
+
+        // Tabbing when there is an active suggestion inserts it.
+        editor.tab(&Default::default(), cx);
+        assert!(!editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one.copilot2\ntwo\nthree\n");
+        assert_eq!(editor.text(cx), "one.copilot2\ntwo\nthree\n");
+
+        // When undoing the previously active suggestion is shown again.
+        editor.undo(&Default::default(), cx);
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one.copilot2\ntwo\nthree\n");
+        assert_eq!(editor.text(cx), "one.co\ntwo\nthree\n");
+
+        // Hide suggestion.
+        editor.cancel(&Default::default(), cx);
+        assert!(!editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one.co\ntwo\nthree\n");
+        assert_eq!(editor.text(cx), "one.co\ntwo\nthree\n");
+    });
+
+    // If an edit occurs outside of this editor but no suggestion is being shown,
+    // we won't make it visible.
+    cx.update_buffer(|buffer, cx| buffer.edit([(6..6, "p")], None, cx));
+    cx.update_editor(|editor, cx| {
+        assert!(!editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one.cop\ntwo\nthree\n");
+        assert_eq!(editor.text(cx), "one.cop\ntwo\nthree\n");
+    });
+
+    // Reset the editor to verify how suggestions behave when tabbing on leading indentation.
+    cx.update_editor(|editor, cx| {
+        editor.set_text("fn foo() {\n  \n}", cx);
+        editor.change_selections(None, cx, |s| {
+            s.select_ranges([Point::new(1, 2)..Point::new(1, 2)])
+        });
+    });
+    handle_copilot_completion_request(
+        &copilot_lsp,
+        vec![copilot::request::Completion {
+            text: "    let x = 4;".into(),
+            range: lsp::Range::new(lsp::Position::new(1, 0), lsp::Position::new(1, 2)),
+            ..Default::default()
+        }],
+        vec![],
+    );
+
+    cx.update_editor(|editor, cx| editor.next_copilot_suggestion(&Default::default(), cx));
+    deterministic.advance_clock(COPILOT_DEBOUNCE_TIMEOUT);
+    cx.update_editor(|editor, cx| {
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "fn foo() {\n    let x = 4;\n}");
+        assert_eq!(editor.text(cx), "fn foo() {\n  \n}");
+
+        // Tabbing inside of leading whitespace inserts indentation without accepting the suggestion.
+        editor.tab(&Default::default(), cx);
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.text(cx), "fn foo() {\n    \n}");
+        assert_eq!(editor.display_text(cx), "fn foo() {\n    let x = 4;\n}");
+
+        // Tabbing again accepts the suggestion.
+        editor.tab(&Default::default(), cx);
+        assert!(!editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.text(cx), "fn foo() {\n    let x = 4;\n}");
+        assert_eq!(editor.display_text(cx), "fn foo() {\n    let x = 4;\n}");
+    });
+}
+
+#[gpui::test]
+async fn test_copilot_completion_invalidation(
+    deterministic: Arc<Deterministic>,
+    cx: &mut gpui::TestAppContext,
+) {
+    let (copilot, copilot_lsp) = Copilot::fake(cx);
+    cx.update(|cx| cx.set_global(copilot));
+    let mut cx = EditorLspTestContext::new_rust(
+        lsp::ServerCapabilities {
+            completion_provider: Some(lsp::CompletionOptions {
+                trigger_characters: Some(vec![".".to_string(), ":".to_string()]),
+                ..Default::default()
+            }),
+            ..Default::default()
+        },
+        cx,
+    )
+    .await;
+
+    cx.set_state(indoc! {"
+        one
+        twˇ
+        three
+    "});
+
+    handle_copilot_completion_request(
+        &copilot_lsp,
+        vec![copilot::request::Completion {
+            text: "two.foo()".into(),
+            range: lsp::Range::new(lsp::Position::new(1, 0), lsp::Position::new(1, 2)),
+            ..Default::default()
+        }],
+        vec![],
+    );
+    cx.update_editor(|editor, cx| editor.next_copilot_suggestion(&Default::default(), cx));
+    deterministic.advance_clock(COPILOT_DEBOUNCE_TIMEOUT);
+    cx.update_editor(|editor, cx| {
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one\ntwo.foo()\nthree\n");
+        assert_eq!(editor.text(cx), "one\ntw\nthree\n");
+
+        editor.backspace(&Default::default(), cx);
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one\ntwo.foo()\nthree\n");
+        assert_eq!(editor.text(cx), "one\nt\nthree\n");
+
+        editor.backspace(&Default::default(), cx);
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one\ntwo.foo()\nthree\n");
+        assert_eq!(editor.text(cx), "one\n\nthree\n");
+
+        // Deleting across the original suggestion range invalidates it.
+        editor.backspace(&Default::default(), cx);
+        assert!(!editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one\nthree\n");
+        assert_eq!(editor.text(cx), "one\nthree\n");
+
+        // Undoing the deletion restores the suggestion.
+        editor.undo(&Default::default(), cx);
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(editor.display_text(cx), "one\ntwo.foo()\nthree\n");
+        assert_eq!(editor.text(cx), "one\n\nthree\n");
+    });
+}
+
+#[gpui::test]
+async fn test_copilot_multibuffer(
+    deterministic: Arc<Deterministic>,
+    cx: &mut gpui::TestAppContext,
+) {
+    let (copilot, copilot_lsp) = Copilot::fake(cx);
+    cx.update(|cx| {
+        cx.set_global(Settings::test(cx));
+        cx.set_global(copilot)
+    });
+
+    let buffer_1 = cx.add_model(|cx| Buffer::new(0, "a = 1\nb = 2\n", cx));
+    let buffer_2 = cx.add_model(|cx| Buffer::new(0, "c = 3\nd = 4\n", cx));
+    let multibuffer = cx.add_model(|cx| {
+        let mut multibuffer = MultiBuffer::new(0);
+        multibuffer.push_excerpts(
+            buffer_1.clone(),
+            [ExcerptRange {
+                context: Point::new(0, 0)..Point::new(2, 0),
+                primary: None,
+            }],
+            cx,
+        );
+        multibuffer.push_excerpts(
+            buffer_2.clone(),
+            [ExcerptRange {
+                context: Point::new(0, 0)..Point::new(2, 0),
+                primary: None,
+            }],
+            cx,
+        );
+        multibuffer
+    });
+    let (_, editor) = cx.add_window(|cx| build_editor(multibuffer, cx));
+
+    handle_copilot_completion_request(
+        &copilot_lsp,
+        vec![copilot::request::Completion {
+            text: "b = 2 + a".into(),
+            range: lsp::Range::new(lsp::Position::new(1, 0), lsp::Position::new(1, 5)),
+            ..Default::default()
+        }],
+        vec![],
+    );
+    editor.update(cx, |editor, cx| {
+        // Ensure copilot suggestions are shown for the first excerpt.
+        editor.change_selections(None, cx, |s| {
+            s.select_ranges([Point::new(1, 5)..Point::new(1, 5)])
+        });
+        editor.next_copilot_suggestion(&Default::default(), cx);
+    });
+    deterministic.advance_clock(COPILOT_DEBOUNCE_TIMEOUT);
+    editor.update(cx, |editor, cx| {
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(
+            editor.display_text(cx),
+            "\n\na = 1\nb = 2 + a\n\n\n\nc = 3\nd = 4\n"
+        );
+        assert_eq!(editor.text(cx), "a = 1\nb = 2\n\nc = 3\nd = 4\n");
+    });
+
+    handle_copilot_completion_request(
+        &copilot_lsp,
+        vec![copilot::request::Completion {
+            text: "d = 4 + c".into(),
+            range: lsp::Range::new(lsp::Position::new(1, 0), lsp::Position::new(1, 6)),
+            ..Default::default()
+        }],
+        vec![],
+    );
+    editor.update(cx, |editor, cx| {
+        // Move to another excerpt, ensuring the suggestion gets cleared.
+        editor.change_selections(None, cx, |s| {
+            s.select_ranges([Point::new(4, 5)..Point::new(4, 5)])
+        });
+        assert!(!editor.has_active_copilot_suggestion(cx));
+        assert_eq!(
+            editor.display_text(cx),
+            "\n\na = 1\nb = 2\n\n\n\nc = 3\nd = 4\n"
+        );
+        assert_eq!(editor.text(cx), "a = 1\nb = 2\n\nc = 3\nd = 4\n");
+
+        // Type a character, ensuring we don't even try to interpolate the previous suggestion.
+        editor.handle_input(" ", cx);
+        assert!(!editor.has_active_copilot_suggestion(cx));
+        assert_eq!(
+            editor.display_text(cx),
+            "\n\na = 1\nb = 2\n\n\n\nc = 3\nd = 4 \n"
+        );
+        assert_eq!(editor.text(cx), "a = 1\nb = 2\n\nc = 3\nd = 4 \n");
+    });
+
+    // Ensure the new suggestion is displayed when the debounce timeout expires.
+    deterministic.advance_clock(COPILOT_DEBOUNCE_TIMEOUT);
+    editor.update(cx, |editor, cx| {
+        assert!(editor.has_active_copilot_suggestion(cx));
+        assert_eq!(
+            editor.display_text(cx),
+            "\n\na = 1\nb = 2\n\n\n\nc = 3\nd = 4 + c\n"
+        );
+        assert_eq!(editor.text(cx), "a = 1\nb = 2\n\nc = 3\nd = 4 \n");
+    });
+}
+
 fn empty_range(row: usize, column: usize) -> Range<DisplayPoint> {
    let point = DisplayPoint::new(row as u32, column as u32);
    point..point
@@ -5971,3 +6282,106 @@ fn assert_selection_ranges(marked_text: &str, view: &mut Editor, cx: &mut ViewCo
        marked_text
    );
 }
+
+/// Handle completion request passing a marked string specifying where the completion
+/// should be triggered from using '|' character, what range should be replaced, and what completions
+/// should be returned using '<' and '>' to delimit the range
+fn handle_completion_request<'a>(
+    cx: &mut EditorLspTestContext<'a>,
+    marked_string: &str,
+    completions: Vec<&'static str>,
+) -> impl Future<Output = ()> {
+    let complete_from_marker: TextRangeMarker = '|'.into();
+    let replace_range_marker: TextRangeMarker = ('<', '>').into();
+    let (_, mut marked_ranges) = marked_text_ranges_by(
+        marked_string,
+        vec![complete_from_marker.clone(), replace_range_marker.clone()],
+    );
+
+    let complete_from_position =
+        cx.to_lsp(marked_ranges.remove(&complete_from_marker).unwrap()[0].start);
+    let replace_range =
+        cx.to_lsp_range(marked_ranges.remove(&replace_range_marker).unwrap()[0].clone());
+
+    let mut request = cx.handle_request::<lsp::request::Completion, _, _>(move |url, params, _| {
+        let completions = completions.clone();
+        async move {
+            assert_eq!(params.text_document_position.text_document.uri, url.clone());
+            assert_eq!(
+                params.text_document_position.position,
+                complete_from_position
+            );
+            Ok(Some(lsp::CompletionResponse::Array(
+                completions
+                    .iter()
+                    .map(|completion_text| lsp::CompletionItem {
+                        label: completion_text.to_string(),
+                        text_edit: Some(lsp::CompletionTextEdit::Edit(lsp::TextEdit {
+                            range: replace_range,
+                            new_text: completion_text.to_string(),
+                        })),
+                        ..Default::default()
+                    })
+                    .collect(),
+            )))
+        }
+    });
+
+    async move {
+        request.next().await;
+    }
+}
+
+fn handle_resolve_completion_request<'a>(
+    cx: &mut EditorLspTestContext<'a>,
+    edits: Option<Vec<(&'static str, &'static str)>>,
+) -> impl Future<Output = ()> {
+    let edits = edits.map(|edits| {
+        edits
+            .iter()
+            .map(|(marked_string, new_text)| {
+                let (_, marked_ranges) = marked_text_ranges(marked_string, false);
+                let replace_range = cx.to_lsp_range(marked_ranges[0].clone());
+                lsp::TextEdit::new(replace_range, new_text.to_string())
+            })
+            .collect::<Vec<_>>()
+    });
+
+    let mut request =
+        cx.handle_request::<lsp::request::ResolveCompletionItem, _, _>(move |_, _, _| {
+            let edits = edits.clone();
+            async move {
+                Ok(lsp::CompletionItem {
+                    additional_text_edits: edits,
+                    ..Default::default()
+                })
+            }
+        });
+
+    async move {
+        request.next().await;
+    }
+}
+
+fn handle_copilot_completion_request(
+    lsp: &lsp::FakeLanguageServer,
+    completions: Vec<copilot::request::Completion>,
+    completions_cycling: Vec<copilot::request::Completion>,
+) {
+    lsp.handle_request::<copilot::request::GetCompletions, _, _>(move |_params, _cx| {
+        let completions = completions.clone();
+        async move {
+            Ok(copilot::request::GetCompletionsResult {
+                completions: completions.clone(),
+            })
+        }
+    });
+    lsp.handle_request::<copilot::request::GetCompletionsCycling, _, _>(move |_params, _cx| {
+        let completions_cycling = completions_cycling.clone();
+        async move {
+            Ok(copilot::request::GetCompletionsResult {
+                completions: completions_cycling.clone(),
+            })
+        }
+    });
+}
--- a/crates/editor/src/element.rs
+++ b/crates/editor/src/element.rs
@@ -29,11 +29,10 @@ use gpui::{
        PathBuilder,
    },
    json::{self, ToJson},
-    platform::CursorStyle,
+    platform::{CursorStyle, Modifiers, MouseButton, MouseButtonEvent, MouseMovedEvent},
    text_layout::{self, Line, RunStyle, TextLayoutCache},
    AppContext, Axis, Border, CursorRegion, Element, ElementBox, EventContext, LayoutContext,
-    Modifiers, MouseButton, MouseButtonEvent, MouseMovedEvent, MouseRegion, MutableAppContext,
-    PaintContext, Quad, SceneBuilder, SizeConstraint, ViewContext, WeakViewHandle,
+    MouseRegion, PaintContext, Quad, SceneBuilder, SizeConstraint, ViewContext, WeakViewHandle,
 };
 use itertools::Itertools;
 use json::json;
@@ -103,14 +102,14 @@ impl EditorElement {
        self.view.upgrade(cx).unwrap().read(cx)
    }

-    fn update_view<F, T>(&self, cx: &mut MutableAppContext, f: F) -> T
+    fn update_view<F, T>(&self, cx: &mut AppContext, f: F) -> T
    where
        F: FnOnce(&mut Editor, &mut ViewContext<Editor>) -> T,
    {
        self.view.upgrade(cx).unwrap().update(cx, f)
    }

-    fn snapshot(&self, cx: &mut MutableAppContext) -> EditorSnapshot {
+    fn snapshot(&self, cx: &mut AppContext) -> EditorSnapshot {
        self.update_view(cx, |view, cx| view.snapshot(cx))
    }

@@ -574,6 +573,23 @@ impl EditorElement {
            }
        }

+        for (ix, fold_indicator) in layout.fold_indicators.iter_mut().enumerate() {
+            if let Some(indicator) = fold_indicator.as_mut() {
+                let position = vec2f(
+                    bounds.width() - layout.gutter_padding,
+                    ix as f32 * line_height - (scroll_top % line_height),
+                );
+                let centering_offset = vec2f(
+                    (layout.gutter_padding + layout.gutter_margin - indicator.size().x()) / 2.,
+                    (line_height - indicator.size().y()) / 2.,
+                );
+
+                let indicator_origin = bounds.origin() + position + centering_offset;
+
+                indicator.paint(indicator_origin, visible_bounds, cx);
+            }
+        }
+
        if let Some((row, indicator)) = layout.code_actions_indicator.as_mut() {
            let mut x = 0.;
            let mut y = *row as f32 * line_height - scroll_top;
@@ -581,19 +597,6 @@ impl EditorElement {
            y += (line_height - indicator.size().y()) / 2.;
            indicator.paint(bounds.origin() + vec2f(x, y), visible_bounds, cx);
        }
-
-        layout.fold_indicators.as_mut().map(|fold_indicators| {
-            for (line, fold_indicator) in fold_indicators.iter_mut() {
-                let mut x = bounds.width() - layout.gutter_padding;
-                let mut y = *line as f32 * line_height - scroll_top;
-
-                x += ((layout.gutter_padding + layout.gutter_margin) - fold_indicator.size().x())
-                    / 2.;
-                y += (line_height - fold_indicator.size().y()) / 2.;
-
-                fold_indicator.paint(bounds.origin() + vec2f(x, y), visible_bounds, cx);
-            }
-        });
    }

    fn paint_diff_hunks(bounds: RectF, layout: &mut LayoutState, cx: &mut PaintContext) {
@@ -739,10 +742,15 @@ impl EditorElement {
                });

                let display_row = range.start.row();
+
+                let buffer_row = DisplayPoint::new(display_row, 0)
+                    .to_point(&layout.position_map.snapshot.display_snapshot)
+                    .row;
+
                cx.scene.push_mouse_region(
                    MouseRegion::new::<FoldMarkers>(self.view.id(), *id as usize, bound)
                        .on_click(MouseButton::Left, move |_, cx| {
-                            cx.dispatch_action(UnfoldAt { display_row })
+                            cx.dispatch_action(UnfoldAt { buffer_row })
                        })
                        .with_notify_on_hover(true)
                        .with_notify_on_click(true),
@@ -1181,24 +1189,6 @@ impl EditorElement {
            .width()
    }

-    fn get_fold_indicators(
-        &self,
-        is_singleton: bool,
-        display_rows: Range<u32>,
-        snapshot: &EditorSnapshot,
-    ) -> Option<Vec<(u32, FoldStatus)>> {
-        is_singleton.then(|| {
-            display_rows
-                .into_iter()
-                .filter_map(|display_row| {
-                    snapshot
-                        .fold_for_line(display_row)
-                        .map(|fold_status| (display_row, fold_status))
-                })
-                .collect()
-        })
-    }
-
    //Folds contained in a hunk are ignored apart from shrinking visual size
    //If a fold contains any hunks then that fold line is marked as modified
    fn layout_git_gutters(
@@ -1226,12 +1216,17 @@ impl EditorElement {
        &self,
        rows: Range<u32>,
        active_rows: &BTreeMap<u32, bool>,
+        is_singleton: bool,
        snapshot: &EditorSnapshot,
        cx: &LayoutContext,
-    ) -> Vec<Option<text_layout::Line>> {
+    ) -> (
+        Vec<Option<text_layout::Line>>,
+        Vec<Option<(FoldStatus, BufferRow, bool)>>,
+    ) {
        let style = &self.style;
        let include_line_numbers = snapshot.mode == EditorMode::Full;
        let mut line_number_layouts = Vec::with_capacity(rows.len());
+        let mut fold_statuses = Vec::with_capacity(rows.len());
        let mut line_number = String::new();
        for (ix, row) in snapshot
            .buffer_rows(rows.start)
@@ -1239,10 +1234,10 @@ impl EditorElement {
            .enumerate()
        {
            let display_row = rows.start + ix as u32;
-            let color = if active_rows.contains_key(&display_row) {
-                style.line_number_active
+            let (active, color) = if active_rows.contains_key(&display_row) {
+                (true, style.line_number_active)
            } else {
-                style.line_number
+                (false, style.line_number)
            };
            if let Some(buffer_row) = row {
                if include_line_numbers {
@@ -1260,13 +1255,23 @@ impl EditorElement {
                            },
                        )],
                    )));
+                    fold_statuses.push(
+                        is_singleton
+                            .then(|| {
+                                snapshot
+                                    .fold_for_line(buffer_row)
+                                    .map(|fold_status| (fold_status, buffer_row, active))
+                            })
+                            .flatten(),
+                    )
                }
            } else {
+                fold_statuses.push(None);
                line_number_layouts.push(None);
            }
        }

-        line_number_layouts
+        (line_number_layouts, fold_statuses)
    }

    fn layout_lines(
@@ -1312,45 +1317,47 @@ impl EditorElement {
                .collect()
        } else {
            let style = &self.style;
-            let chunks = snapshot.chunks(rows.clone(), true).map(|chunk| {
-                let mut highlight_style = chunk
-                    .syntax_highlight_id
-                    .and_then(|id| id.style(&style.syntax));
+            let chunks = snapshot
+                .chunks(rows.clone(), true, Some(style.theme.suggestion))
+                .map(|chunk| {
+                    let mut highlight_style = chunk
+                        .syntax_highlight_id
+                        .and_then(|id| id.style(&style.syntax));
+
+                    if let Some(chunk_highlight) = chunk.highlight_style {
+                        if let Some(highlight_style) = highlight_style.as_mut() {
+                            highlight_style.highlight(chunk_highlight);
+                        } else {
+                            highlight_style = Some(chunk_highlight);
+                        }
+                    }
+
+                    let mut diagnostic_highlight = HighlightStyle::default();
+
+                    if chunk.is_unnecessary {
+                        diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
+                    }
+
+                    if let Some(severity) = chunk.diagnostic_severity {
+                        // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
+                        if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
+                            let diagnostic_style = super::diagnostic_style(severity, true, style);
+                            diagnostic_highlight.underline = Some(Underline {
+                                color: Some(diagnostic_style.message.text.color),
+                                thickness: 1.0.into(),
+                                squiggly: true,
+                            });
+                        }
+                    }

-                if let Some(chunk_highlight) = chunk.highlight_style {
                    if let Some(highlight_style) = highlight_style.as_mut() {
-                        highlight_style.highlight(chunk_highlight);
+                        highlight_style.highlight(diagnostic_highlight);
                    } else {
-                        highlight_style = Some(chunk_highlight);
+                        highlight_style = Some(diagnostic_highlight);
                    }
-                }

-                let mut diagnostic_highlight = HighlightStyle::default();
-
-                if chunk.is_unnecessary {
-                    diagnostic_highlight.fade_out = Some(style.unnecessary_code_fade);
-                }
-
-                if let Some(severity) = chunk.diagnostic_severity {
-                    // Omit underlines for HINT/INFO diagnostics on 'unnecessary' code.
-                    if severity <= DiagnosticSeverity::WARNING || !chunk.is_unnecessary {
-                        let diagnostic_style = super::diagnostic_style(severity, true, style);
-                        diagnostic_highlight.underline = Some(Underline {
-                            color: Some(diagnostic_style.message.text.color),
-                            thickness: 1.0.into(),
-                            squiggly: true,
-                        });
-                    }
-                }
-
-                if let Some(highlight_style) = highlight_style.as_mut() {
-                    highlight_style.highlight(diagnostic_highlight);
-                } else {
-                    highlight_style = Some(diagnostic_highlight);
-                }
-
-                (chunk.text, highlight_style)
-            });
+                    (chunk.text, highlight_style)
+                });
            layout_highlighted_chunks(
                chunks,
                &style.text,
@@ -1797,13 +1804,16 @@ impl Element for EditorElement {
            })
            .collect();

-        let line_number_layouts =
-            self.layout_line_numbers(start_row..end_row, &active_rows, &snapshot, cx);
+        let (line_number_layouts, fold_statuses) = self.layout_line_numbers(
+            start_row..end_row,
+            &active_rows,
+            is_singleton,
+            &snapshot,
+            cx,
+        );

        let display_hunks = self.layout_git_gutters(start_row..end_row, &snapshot);

-        let folds = self.get_fold_indicators(is_singleton, start_row..end_row, &snapshot);
-
        let scrollbar_row_range = scroll_position.y()..(scroll_position.y() + height_in_lines);

        let mut max_visible_line_width = 0.0;
@@ -1896,8 +1906,7 @@ impl Element for EditorElement {
            mode = view.mode;

            view.render_fold_indicators(
-                folds,
-                &active_rows,
+                fold_statuses,
                &style,
                view.gutter_hovered,
                line_height,
@@ -1929,8 +1938,8 @@ impl Element for EditorElement {
            );
        }

-        fold_indicators.as_mut().map(|fold_indicators| {
-            for (_, indicator) in fold_indicators.iter_mut() {
+        for fold_indicator in fold_indicators.iter_mut() {
+            if let Some(indicator) = fold_indicator.as_mut() {
                indicator.layout(
                    SizeConstraint::strict_along(
                        Axis::Vertical,
@@ -1939,7 +1948,7 @@ impl Element for EditorElement {
                    cx,
                );
            }
-        });
+        }

        if let Some((_, hover_popovers)) = hover.as_mut() {
            for hover_popover in hover_popovers.iter_mut() {
@@ -2123,7 +2132,7 @@ pub struct LayoutState {
    context_menu: Option<(DisplayPoint, ElementBox)>,
    code_actions_indicator: Option<(u32, ElementBox)>,
    hover_popovers: Option<(DisplayPoint, Vec<ElementBox>)>,
-    fold_indicators: Option<Vec<(u32, ElementBox)>>,
+    fold_indicators: Vec<Option<ElementBox>>,
 }

 pub struct PositionMap {
@@ -2512,7 +2521,7 @@ mod tests {
    use util::test::sample_text;

    #[gpui::test]
-    fn test_layout_line_numbers(cx: &mut gpui::MutableAppContext) {
+    fn test_layout_line_numbers(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
        let buffer = MultiBuffer::build_simple(&sample_text(6, 6, 'a'), cx);
        let (window_id, editor) = cx.add_window(Default::default(), |cx| {
@@ -2524,13 +2533,15 @@ mod tests {
            let snapshot = editor.snapshot(cx);
            let mut presenter = cx.build_presenter(window_id, 30., Default::default());
            let layout_cx = presenter.build_layout_context(Vector2F::zero(), false, cx);
-            element.layout_line_numbers(0..6, &Default::default(), &snapshot, &layout_cx)
+            element
+                .layout_line_numbers(0..6, &Default::default(), false, &snapshot, &layout_cx)
+                .0
        });
        assert_eq!(layouts.len(), 6);
    }

    #[gpui::test]
-    fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::MutableAppContext) {
+    fn test_layout_with_placeholder_text_and_blocks(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
        let buffer = MultiBuffer::build_simple("", cx);
        let (window_id, editor) = cx.add_window(Default::default(), |cx| {
--- a/crates/editor/src/hover_popover.rs
+++ b/crates/editor/src/hover_popover.rs
@@ -3,9 +3,8 @@ use gpui::{
    actions,
    elements::{Flex, MouseEventHandler, Padding, Text},
    impl_internal_actions,
-    platform::CursorStyle,
-    Axis, Element, ElementBox, ModelHandle, MouseButton, MutableAppContext, RenderContext, Task,
-    ViewContext,
+    platform::{CursorStyle, MouseButton},
+    AppContext, Axis, Element, ElementBox, ModelHandle, RenderContext, Task, ViewContext,
 };
 use language::{Bias, DiagnosticEntry, DiagnosticSeverity};
 use project::{HoverBlock, Project};
@@ -36,7 +35,7 @@ pub struct HideHover;
 actions!(editor, [Hover]);
 impl_internal_actions!(editor, [HoverAt, HideHover]);

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(hover);
    cx.add_action(hover_at);
    cx.add_action(hide_hover);
--- a/crates/editor/src/items.rs
+++ b/crates/editor/src/items.rs
@@ -7,8 +7,8 @@ use anyhow::{anyhow, Context, Result};
 use collections::HashSet;
 use futures::future::try_join_all;
 use gpui::{
-    elements::*, geometry::vector::vec2f, AppContext, Entity, ModelHandle, MutableAppContext,
-    RenderContext, Subscription, Task, View, ViewContext, ViewHandle, WeakViewHandle,
+    elements::*, geometry::vector::vec2f, AppContext, Entity, ModelHandle, RenderContext,
+    Subscription, Task, View, ViewContext, ViewHandle, WeakViewHandle,
 };
 use language::{
    proto::serialize_anchor as serialize_text_anchor, Bias, Buffer, OffsetRangeExt, Point,
@@ -48,7 +48,7 @@ impl FollowableItem for Editor {
        project: ModelHandle<Project>,
        remote_id: ViewId,
        state: &mut Option<proto::view::Variant>,
-        cx: &mut MutableAppContext,
+        cx: &mut AppContext,
    ) -> Option<Task<Result<ViewHandle<Self>>>> {
        let Some(proto::view::Variant::Editor(_)) = state else { return None };
        let Some(proto::view::Variant::Editor(state)) = state.take() else { unreachable!() };
@@ -538,11 +538,7 @@ impl Item for Editor {
                let description = path.to_string_lossy();
                Some(
                    Label::new(
-                        if description.len() > MAX_TAB_TITLE_LEN {
-                            description[..MAX_TAB_TITLE_LEN].to_string() + "…"
-                        } else {
-                            description.into()
-                        },
+                        util::truncate_and_trailoff(&description, MAX_TAB_TITLE_LEN),
                        style.description.text.clone(),
                    )
                    .contained()
@@ -751,11 +747,15 @@ impl Item for Editor {
            .map(|path| path.to_string_lossy().to_string())
            .unwrap_or_else(|| "untitled".to_string());

-        let mut breadcrumbs = vec![Label::new(filename, theme.breadcrumbs.text.clone()).boxed()];
+        let filename_label = Label::new(filename, theme.workspace.breadcrumbs.default.text.clone());
+        let mut breadcrumbs = vec![filename_label.boxed()];
        breadcrumbs.extend(symbols.into_iter().map(|symbol| {
-            Text::new(symbol.text, theme.breadcrumbs.text.clone())
-                .with_highlights(symbol.highlight_ranges)
-                .boxed()
+            Text::new(
+                symbol.text,
+                theme.workspace.breadcrumbs.default.text.clone(),
+            )
+            .with_highlights(symbol.highlight_ranges)
+            .boxed()
        }));
        Some(breadcrumbs)
    }
@@ -769,7 +769,7 @@ impl Item for Editor {
            buffer: ModelHandle<Buffer>,
            workspace_id: WorkspaceId,
            item_id: ItemId,
-            cx: &mut MutableAppContext,
+            cx: &mut AppContext,
        ) {
            if let Some(file) = buffer.read(cx).file().and_then(|file| file.as_local()) {
                let path = file.abs_path(cx);
@@ -835,7 +835,7 @@ impl Item for Editor {
                        .context("Project item at stored path was not a buffer")?;

                    Ok(cx.update(|cx| {
-                        cx.add_view(pane, |cx| {
+                        cx.add_view(&pane, |cx| {
                            let mut editor = Editor::for_buffer(buffer, Some(project), cx);
                            editor.read_scroll_position_from_db(item_id, workspace_id, cx);
                            editor
@@ -1161,7 +1161,7 @@ fn path_for_file<'a>(
 #[cfg(test)]
 mod tests {
    use super::*;
-    use gpui::MutableAppContext;
+    use gpui::AppContext;
    use std::{
        path::{Path, PathBuf},
        sync::Arc,
@@ -1169,7 +1169,7 @@ mod tests {
    };

    #[gpui::test]
-    fn test_path_for_file(cx: &mut MutableAppContext) {
+    fn test_path_for_file(cx: &mut AppContext) {
        let file = TestFile {
            path: Path::new("").into(),
            full_path: PathBuf::from(""),
--- a/crates/editor/src/link_go_to_definition.rs
+++ b/crates/editor/src/link_go_to_definition.rs
@@ -1,6 +1,6 @@
 use std::ops::Range;

-use gpui::{impl_internal_actions, MutableAppContext, Task, ViewContext};
+use gpui::{impl_internal_actions, AppContext, Task, ViewContext};
 use language::{Bias, ToOffset};
 use project::LocationLink;
 use settings::Settings;
@@ -38,7 +38,7 @@ impl_internal_actions!(
    ]
 );

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(update_go_to_definition_link);
    cx.add_action(go_to_fetched_definition);
    cx.add_action(go_to_fetched_type_definition);
@@ -358,7 +358,10 @@ fn go_to_fetched_definition_of_kind(
 #[cfg(test)]
 mod tests {
    use futures::StreamExt;
-    use gpui::{Modifiers, ModifiersChangedEvent, View};
+    use gpui::{
+        platform::{self, Modifiers, ModifiersChangedEvent},
+        View,
+    };
    use indoc::indoc;
    use lsp::request::{GotoDefinition, GotoTypeDefinition};

@@ -430,7 +433,7 @@ mod tests {
        // Unpress shift causes highlight to go away (normal goto-definition is not valid here)
        cx.update_editor(|editor, cx| {
            editor.modifiers_changed(
-                &gpui::ModifiersChangedEvent {
+                &platform::ModifiersChangedEvent {
                    modifiers: Modifiers {
                        cmd: true,
                        ..Default::default()
--- a/crates/editor/src/mouse_context_menu.rs
+++ b/crates/editor/src/mouse_context_menu.rs
@@ -1,6 +1,6 @@
 use context_menu::ContextMenuItem;
 use gpui::{
-    elements::AnchorCorner, geometry::vector::Vector2F, impl_internal_actions, MutableAppContext,
+    elements::AnchorCorner, geometry::vector::Vector2F, impl_internal_actions, AppContext,
    ViewContext,
 };

@@ -17,7 +17,7 @@ pub struct DeployMouseContextMenu {

 impl_internal_actions!(editor, [DeployMouseContextMenu]);

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(deploy_context_menu);
 }

--- a/crates/editor/src/movement.rs
+++ b/crates/editor/src/movement.rs
@@ -69,16 +69,11 @@ pub fn up_by_rows(
        goal_column = 0;
    }

-    let clip_bias = if point.column() == map.line_len(point.row()) {
-        Bias::Left
-    } else {
-        Bias::Right
-    };
-
-    (
-        map.clip_point(point, clip_bias),
-        SelectionGoal::Column(goal_column),
-    )
+    let mut clipped_point = map.clip_point(point, Bias::Left);
+    if clipped_point.row() < point.row() {
+        clipped_point = map.clip_point(point, Bias::Right);
+    }
+    (clipped_point, SelectionGoal::Column(goal_column))
 }

 pub fn down_by_rows(
@@ -105,16 +100,11 @@ pub fn down_by_rows(
        goal_column = map.column_to_chars(point.row(), point.column())
    }

-    let clip_bias = if point.column() == map.line_len(point.row()) {
-        Bias::Left
-    } else {
-        Bias::Right
-    };
-
-    (
-        map.clip_point(point, clip_bias),
-        SelectionGoal::Column(goal_column),
-    )
+    let mut clipped_point = map.clip_point(point, Bias::Right);
+    if clipped_point.row() > point.row() {
+        clipped_point = map.clip_point(point, Bias::Left);
+    }
+    (clipped_point, SelectionGoal::Column(goal_column))
 }

 pub fn line_beginning(
@@ -382,9 +372,9 @@ mod tests {
    use settings::Settings;

    #[gpui::test]
-    fn test_previous_word_start(cx: &mut gpui::MutableAppContext) {
+    fn test_previous_word_start(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
-        fn assert(marked_text: &str, cx: &mut gpui::MutableAppContext) {
+        fn assert(marked_text: &str, cx: &mut gpui::AppContext) {
            let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
            assert_eq!(
                previous_word_start(&snapshot, display_points[1]),
@@ -409,9 +399,9 @@ mod tests {
    }

    #[gpui::test]
-    fn test_previous_subword_start(cx: &mut gpui::MutableAppContext) {
+    fn test_previous_subword_start(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
-        fn assert(marked_text: &str, cx: &mut gpui::MutableAppContext) {
+        fn assert(marked_text: &str, cx: &mut gpui::AppContext) {
            let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
            assert_eq!(
                previous_subword_start(&snapshot, display_points[1]),
@@ -443,11 +433,11 @@ mod tests {
    }

    #[gpui::test]
-    fn test_find_preceding_boundary(cx: &mut gpui::MutableAppContext) {
+    fn test_find_preceding_boundary(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
        fn assert(
            marked_text: &str,
-            cx: &mut gpui::MutableAppContext,
+            cx: &mut gpui::AppContext,
            is_boundary: impl FnMut(char, char) -> bool,
        ) {
            let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
@@ -475,9 +465,9 @@ mod tests {
    }

    #[gpui::test]
-    fn test_next_word_end(cx: &mut gpui::MutableAppContext) {
+    fn test_next_word_end(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
-        fn assert(marked_text: &str, cx: &mut gpui::MutableAppContext) {
+        fn assert(marked_text: &str, cx: &mut gpui::AppContext) {
            let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
            assert_eq!(
                next_word_end(&snapshot, display_points[0]),
@@ -499,9 +489,9 @@ mod tests {
    }

    #[gpui::test]
-    fn test_next_subword_end(cx: &mut gpui::MutableAppContext) {
+    fn test_next_subword_end(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
-        fn assert(marked_text: &str, cx: &mut gpui::MutableAppContext) {
+        fn assert(marked_text: &str, cx: &mut gpui::AppContext) {
            let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
            assert_eq!(
                next_subword_end(&snapshot, display_points[0]),
@@ -532,11 +522,11 @@ mod tests {
    }

    #[gpui::test]
-    fn test_find_boundary(cx: &mut gpui::MutableAppContext) {
+    fn test_find_boundary(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
        fn assert(
            marked_text: &str,
-            cx: &mut gpui::MutableAppContext,
+            cx: &mut gpui::AppContext,
            is_boundary: impl FnMut(char, char) -> bool,
        ) {
            let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
@@ -564,9 +554,9 @@ mod tests {
    }

    #[gpui::test]
-    fn test_surrounding_word(cx: &mut gpui::MutableAppContext) {
+    fn test_surrounding_word(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
-        fn assert(marked_text: &str, cx: &mut gpui::MutableAppContext) {
+        fn assert(marked_text: &str, cx: &mut gpui::AppContext) {
            let (snapshot, display_points) = marked_display_snapshot(marked_text, cx);
            assert_eq!(
                surrounding_word(&snapshot, display_points[1]),
@@ -585,9 +575,12 @@ mod tests {
    }

    #[gpui::test]
-    fn test_move_up_and_down_with_excerpts(cx: &mut gpui::MutableAppContext) {
+    fn test_move_up_and_down_with_excerpts(cx: &mut gpui::AppContext) {
        cx.set_global(Settings::test(cx));
-        let family_id = cx.font_cache().load_family(&["Helvetica"]).unwrap();
+        let family_id = cx
+            .font_cache()
+            .load_family(&["Helvetica"], &Default::default())
+            .unwrap();
        let font_id = cx
            .font_cache()
            .select_font(family_id, &Default::default())
--- a/crates/editor/src/multi_buffer.rs
+++ b/crates/editor/src/multi_buffer.rs
@@ -1489,15 +1489,12 @@ impl MultiBuffer {

 #[cfg(any(test, feature = "test-support"))]
 impl MultiBuffer {
-    pub fn build_simple(text: &str, cx: &mut gpui::MutableAppContext) -> ModelHandle<Self> {
+    pub fn build_simple(text: &str, cx: &mut gpui::AppContext) -> ModelHandle<Self> {
        let buffer = cx.add_model(|cx| Buffer::new(0, text, cx));
        cx.add_model(|cx| Self::singleton(buffer, cx))
    }

-    pub fn build_random(
-        rng: &mut impl rand::Rng,
-        cx: &mut gpui::MutableAppContext,
-    ) -> ModelHandle<Self> {
+    pub fn build_random(rng: &mut impl rand::Rng, cx: &mut gpui::AppContext) -> ModelHandle<Self> {
        cx.add_model(|cx| {
            let mut multibuffer = MultiBuffer::new(0);
            let mutation_count = rng.gen_range(1..=5);
@@ -2194,7 +2191,11 @@ impl MultiBufferSnapshot {

    pub fn buffer_line_for_row(&self, row: u32) -> Option<(&BufferSnapshot, Range<Point>)> {
        let mut cursor = self.excerpts.cursor::<Point>();
-        cursor.seek(&Point::new(row, 0), Bias::Right, &());
+        let point = Point::new(row, 0);
+        cursor.seek(&point, Bias::Right, &());
+        if cursor.item().is_none() && *cursor.start() == point {
+            cursor.prev(&());
+        }
        if let Some(excerpt) = cursor.item() {
            let overshoot = row - cursor.start().row;
            let excerpt_start = excerpt.range.context.start.to_point(&excerpt.buffer);
@@ -2929,6 +2930,10 @@ impl MultiBufferSnapshot {
        Some(self.excerpt(excerpt_id)?.buffer_id)
    }

+    pub fn buffer_for_excerpt(&self, excerpt_id: ExcerptId) -> Option<&BufferSnapshot> {
+        Some(&self.excerpt(excerpt_id)?.buffer)
+    }
+
    fn excerpt<'a>(&'a self, excerpt_id: ExcerptId) -> Option<&'a Excerpt> {
        let mut cursor = self.excerpts.cursor::<Option<&Locator>>();
        let locator = self.excerpt_locator_for_id(excerpt_id);
@@ -3721,7 +3726,7 @@ where
 mod tests {
    use super::*;
    use futures::StreamExt;
-    use gpui::{MutableAppContext, TestAppContext};
+    use gpui::{AppContext, TestAppContext};
    use language::{Buffer, Rope};
    use rand::prelude::*;
    use settings::Settings;
@@ -3731,7 +3736,7 @@ mod tests {
    use util::test::sample_text;

    #[gpui::test]
-    fn test_singleton(cx: &mut MutableAppContext) {
+    fn test_singleton(cx: &mut AppContext) {
        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
        let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));

@@ -3758,7 +3763,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_remote(cx: &mut MutableAppContext) {
+    fn test_remote(cx: &mut AppContext) {
        let host_buffer = cx.add_model(|cx| Buffer::new(0, "a", cx));
        let guest_buffer = cx.add_model(|cx| {
            let state = host_buffer.read(cx).to_proto();
@@ -3789,7 +3794,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_excerpt_boundaries_and_clipping(cx: &mut MutableAppContext) {
+    fn test_excerpt_boundaries_and_clipping(cx: &mut AppContext) {
        let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'a'), cx));
        let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(6, 6, 'g'), cx));
        let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
@@ -4013,7 +4018,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_excerpt_events(cx: &mut MutableAppContext) {
+    fn test_excerpt_events(cx: &mut AppContext) {
        let buffer_1 = cx.add_model(|cx| Buffer::new(0, sample_text(10, 3, 'a'), cx));
        let buffer_2 = cx.add_model(|cx| Buffer::new(0, sample_text(10, 3, 'm'), cx));

@@ -4090,7 +4095,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_push_excerpts_with_context_lines(cx: &mut MutableAppContext) {
+    fn test_push_excerpts_with_context_lines(cx: &mut AppContext) {
        let buffer = cx.add_model(|cx| Buffer::new(0, sample_text(20, 3, 'a'), cx));
        let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
        let anchor_ranges = multibuffer.update(cx, |multibuffer, cx| {
@@ -4164,7 +4169,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_empty_multibuffer(cx: &mut MutableAppContext) {
+    fn test_empty_multibuffer(cx: &mut AppContext) {
        let multibuffer = cx.add_model(|_| MultiBuffer::new(0));

        let snapshot = multibuffer.read(cx).snapshot(cx);
@@ -4174,7 +4179,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_singleton_multibuffer_anchors(cx: &mut MutableAppContext) {
+    fn test_singleton_multibuffer_anchors(cx: &mut AppContext) {
        let buffer = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
        let multibuffer = cx.add_model(|cx| MultiBuffer::singleton(buffer.clone(), cx));
        let old_snapshot = multibuffer.read(cx).snapshot(cx);
@@ -4194,7 +4199,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_multibuffer_anchors(cx: &mut MutableAppContext) {
+    fn test_multibuffer_anchors(cx: &mut AppContext) {
        let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
        let buffer_2 = cx.add_model(|cx| Buffer::new(0, "efghi", cx));
        let multibuffer = cx.add_model(|cx| {
@@ -4252,7 +4257,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_resolving_anchors_after_replacing_their_excerpts(cx: &mut MutableAppContext) {
+    fn test_resolving_anchors_after_replacing_their_excerpts(cx: &mut AppContext) {
        let buffer_1 = cx.add_model(|cx| Buffer::new(0, "abcd", cx));
        let buffer_2 = cx.add_model(|cx| Buffer::new(0, "ABCDEFGHIJKLMNOP", cx));
        let multibuffer = cx.add_model(|_| MultiBuffer::new(0));
@@ -4555,7 +4560,7 @@ mod tests {
    }

    #[gpui::test(iterations = 100)]
-    fn test_random_multibuffer(cx: &mut MutableAppContext, mut rng: StdRng) {
+    fn test_random_multibuffer(cx: &mut AppContext, mut rng: StdRng) {
        let operations = env::var("OPERATIONS")
            .map(|i| i.parse().expect("invalid `OPERATIONS` variable"))
            .unwrap_or(10);
@@ -4972,7 +4977,7 @@ mod tests {
    }

    #[gpui::test]
-    fn test_history(cx: &mut MutableAppContext) {
+    fn test_history(cx: &mut AppContext) {
        cx.set_global(Settings::test(cx));
        let buffer_1 = cx.add_model(|cx| Buffer::new(0, "1234", cx));
        let buffer_2 = cx.add_model(|cx| Buffer::new(0, "5678", cx));
--- a/crates/editor/src/scroll.rs
+++ b/crates/editor/src/scroll.rs
@@ -9,7 +9,7 @@ use std::{

 use gpui::{
    geometry::vector::{vec2f, Vector2F},
-    Axis, MutableAppContext, Task, ViewContext,
+    AppContext, Axis, Task, ViewContext,
 };
 use language::{Bias, Point};
 use util::ResultExt;
@@ -369,7 +369,7 @@ impl Editor {
    ///     Ordering::Equal => on screen
    ///     Ordering::Less => above the screen
    ///     Ordering::Greater => below the screen
-    pub fn newest_selection_on_screen(&self, cx: &mut MutableAppContext) -> Ordering {
+    pub fn newest_selection_on_screen(&self, cx: &mut AppContext) -> Ordering {
        let snapshot = self.display_map.update(cx, |map, cx| map.snapshot(cx));
        let newest_head = self
            .selections
--- a/crates/editor/src/scroll/actions.rs
+++ b/crates/editor/src/scroll/actions.rs
@@ -1,6 +1,5 @@
 use gpui::{
-    actions, geometry::vector::Vector2F, impl_internal_actions, Axis, MutableAppContext,
-    ViewContext,
+    actions, geometry::vector::Vector2F, impl_internal_actions, AppContext, Axis, ViewContext,
 };
 use language::Bias;

@@ -32,7 +31,7 @@ pub struct Scroll {

 impl_internal_actions!(editor, [Scroll]);

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(Editor::next_screen);
    cx.add_action(Editor::scroll);
    cx.add_action(Editor::scroll_cursor_top);
--- a/crates/editor/src/selections_collection.rs
+++ b/crates/editor/src/selections_collection.rs
@@ -6,7 +6,7 @@ use std::{
 };

 use collections::HashMap;
-use gpui::{AppContext, ModelHandle, MutableAppContext};
+use gpui::{AppContext, ModelHandle};
 use itertools::Itertools;
 use language::{Bias, Point, Selection, SelectionGoal, TextDimension, ToPoint};
 use util::post_inc;
@@ -53,7 +53,7 @@ impl SelectionsCollection {
        }
    }

-    fn display_map(&self, cx: &mut MutableAppContext) -> DisplaySnapshot {
+    fn display_map(&self, cx: &mut AppContext) -> DisplaySnapshot {
        self.display_map.update(cx, |map, cx| map.snapshot(cx))
    }

@@ -136,7 +136,7 @@ impl SelectionsCollection {
    }

    // Returns all of the selections, adjusted to take into account the selection line_mode
-    pub fn all_adjusted(&self, cx: &mut MutableAppContext) -> Vec<Selection<Point>> {
+    pub fn all_adjusted(&self, cx: &mut AppContext) -> Vec<Selection<Point>> {
        let mut selections = self.all::<Point>(cx);
        if self.line_mode {
            let map = self.display_map(cx);
@@ -151,7 +151,7 @@ impl SelectionsCollection {

    pub fn all_adjusted_display(
        &self,
-        cx: &mut MutableAppContext,
+        cx: &mut AppContext,
    ) -> (DisplaySnapshot, Vec<Selection<DisplayPoint>>) {
        if self.line_mode {
            let selections = self.all::<Point>(cx);
@@ -198,7 +198,7 @@ impl SelectionsCollection {

    pub fn all_display(
        &self,
-        cx: &mut MutableAppContext,
+        cx: &mut AppContext,
    ) -> (DisplaySnapshot, Vec<Selection<DisplayPoint>>) {
        let display_map = self.display_map(cx);
        let selections = self
@@ -224,7 +224,7 @@ impl SelectionsCollection {
        resolve(self.newest_anchor(), &self.buffer(cx))
    }

-    pub fn newest_display(&self, cx: &mut MutableAppContext) -> Selection<DisplayPoint> {
+    pub fn newest_display(&self, cx: &mut AppContext) -> Selection<DisplayPoint> {
        let display_map = self.display_map(cx);
        let selection = self
            .newest_anchor()
@@ -279,7 +279,7 @@ impl SelectionsCollection {
    }

    #[cfg(any(test, feature = "test-support"))]
-    pub fn display_ranges(&self, cx: &mut MutableAppContext) -> Vec<Range<DisplayPoint>> {
+    pub fn display_ranges(&self, cx: &mut AppContext) -> Vec<Range<DisplayPoint>> {
        let display_map = self.display_map(cx);
        self.disjoint_anchors()
            .iter()
@@ -324,7 +324,7 @@ impl SelectionsCollection {

    pub(crate) fn change_with<R>(
        &mut self,
-        cx: &mut MutableAppContext,
+        cx: &mut AppContext,
        change: impl FnOnce(&mut MutableSelectionsCollection) -> R,
    ) -> (bool, R) {
        let mut mutable_collection = MutableSelectionsCollection {
@@ -345,7 +345,7 @@ impl SelectionsCollection {
 pub struct MutableSelectionsCollection<'a> {
    collection: &'a mut SelectionsCollection,
    selections_changed: bool,
-    cx: &'a mut MutableAppContext,
+    cx: &'a mut AppContext,
 }

 impl<'a> MutableSelectionsCollection<'a> {
--- a/crates/editor/src/test.rs
+++ b/crates/editor/src/test.rs
@@ -21,11 +21,14 @@ fn init_logger() {
 // Returns a snapshot from text containing '|' character markers with the markers removed, and DisplayPoints for each one.
 pub fn marked_display_snapshot(
    text: &str,
-    cx: &mut gpui::MutableAppContext,
+    cx: &mut gpui::AppContext,
 ) -> (DisplaySnapshot, Vec<DisplayPoint>) {
    let (unmarked_text, markers) = marked_text_offsets(text);

-    let family_id = cx.font_cache().load_family(&["Helvetica"]).unwrap();
+    let family_id = cx
+        .font_cache()
+        .load_family(&["Helvetica"], &Default::default())
+        .unwrap();
    let font_id = cx
        .font_cache()
        .select_font(family_id, &Default::default())
--- a/crates/feedback/Cargo.toml
+++ b/crates/feedback/Cargo.toml
@@ -21,14 +21,15 @@ gpui = { path = "../gpui" }
 human_bytes = "0.4.1"
 isahc = "1.7"
 lazy_static = "1.4.0"
-postage = { version = "0.4", features = ["futures-traits"] }
+postage = { workspace = true }
 project = { path = "../project" }
 search = { path = "../search" }
-serde = { version = "1.0", features = ["derive", "rc"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 settings = { path = "../settings" }
 sysinfo = "0.27.1"
 theme = { path = "../theme" }
 tree-sitter-markdown = { git = "https://github.com/MDeiml/tree-sitter-markdown", rev = "330ecab87a3e3a7211ac69bbadc19eabecdb1cca" }
 urlencoding = "2.1.2"
 util = { path = "../util" }
-workspace = { path = "../workspace" }
+workspace = { path = "../workspace" }
--- a/crates/feedback/src/deploy_feedback_button.rs
+++ b/crates/feedback/src/deploy_feedback_button.rs
@@ -1,4 +1,8 @@
-use gpui::{elements::*, CursorStyle, Entity, MouseButton, RenderContext, View, ViewContext};
+use gpui::{
+    elements::*,
+    platform::{CursorStyle, MouseButton},
+    Entity, RenderContext, View, ViewContext,
+};
 use settings::Settings;
 use workspace::{item::ItemHandle, StatusItemView};

@@ -36,7 +40,7 @@ impl View for DeployFeedbackButton {
                        .item
                        .style_for(state, active);

-                    Svg::new("icons/speech_bubble_12.svg")
+                    Svg::new("icons/feedback_16.svg")
                        .with_color(style.icon_color)
                        .constrained()
                        .with_width(style.icon_size)
@@ -56,7 +60,7 @@ impl View for DeployFeedbackButton {
                })
                .with_tooltip::<Self, _>(
                    0,
-                    "Give Feedback".into(),
+                    "Send Feedback".into(),
                    Some(Box::new(GiveFeedback)),
                    theme.tooltip.clone(),
                    cx,
--- a/crates/feedback/src/feedback.rs
+++ b/crates/feedback/src/feedback.rs
@@ -6,7 +6,7 @@ pub mod submit_feedback_button;
 use std::sync::Arc;

 mod system_specs;
-use gpui::{actions, impl_actions, ClipboardItem, MutableAppContext, PromptLevel, ViewContext};
+use gpui::{actions, impl_actions, platform::PromptLevel, AppContext, ClipboardItem, ViewContext};
 use serde::Deserialize;
 use system_specs::SystemSpecs;
 use workspace::{AppState, Workspace};
@@ -28,7 +28,7 @@ actions!(
    ]
 );

-pub fn init(app_state: Arc<AppState>, cx: &mut MutableAppContext) {
+pub fn init(app_state: Arc<AppState>, cx: &mut AppContext) {
    let system_specs = SystemSpecs::new(&cx);
    let system_specs_text = system_specs.to_string();

@@ -37,7 +37,7 @@ pub fn init(app_state: Arc<AppState>, cx: &mut MutableAppContext) {
    cx.add_global_action(move |action: &OpenBrowser, cx| cx.platform().open_url(&action.url));

    let url = format!(
-        "https://github.com/zed-industries/community/issues/new?assignees=&labels=defect%2Ctriage&template=2_bug_report.yml&environment={}", 
+        "https://github.com/zed-industries/community/issues/new?assignees=&labels=defect%2Ctriage&template=2_bug_report.yml&environment={}",
        urlencoding::encode(&system_specs_text)
    );

--- a/crates/feedback/src/feedback_editor.rs
+++ b/crates/feedback/src/feedback_editor.rs
@@ -10,9 +10,10 @@ use editor::{Anchor, Editor};
 use futures::AsyncReadExt;
 use gpui::{
    actions,
-    elements::{ChildView, Flex, Label, ParentElement},
-    serde_json, AnyViewHandle, AppContext, Element, ElementBox, Entity, ModelHandle,
-    MutableAppContext, PromptLevel, RenderContext, Task, View, ViewContext, ViewHandle,
+    elements::{ChildView, Flex, Label, ParentElement, Svg},
+    platform::PromptLevel,
+    serde_json, AnyViewHandle, AppContext, Element, ElementBox, Entity, ModelHandle, RenderContext,
+    Task, View, ViewContext, ViewHandle,
 };
 use isahc::Request;
 use language::Buffer;
@@ -35,7 +36,7 @@ const FEEDBACK_SUBMISSION_ERROR_TEXT: &str =

 actions!(feedback, [GiveFeedback, SubmitFeedback]);

-pub fn init(system_specs: SystemSpecs, app_state: Arc<AppState>, cx: &mut MutableAppContext) {
+pub fn init(system_specs: SystemSpecs, app_state: Arc<AppState>, cx: &mut AppContext) {
    cx.add_action({
        move |workspace: &mut Workspace, _: &GiveFeedback, cx: &mut ViewContext<Workspace>| {
            FeedbackEditor::deploy(system_specs.clone(), workspace, app_state.clone(), cx);
@@ -250,7 +251,17 @@ impl Item for FeedbackEditor {
    fn tab_content(&self, _: Option<usize>, style: &theme::Tab, _: &AppContext) -> ElementBox {
        Flex::row()
            .with_child(
-                Label::new("Feedback", style.label.clone())
+                Svg::new("icons/feedback_16.svg")
+                    .with_color(style.label.text.color)
+                    .constrained()
+                    .with_width(style.type_icon_width)
+                    .aligned()
+                    .contained()
+                    .with_margin_right(style.spacing)
+                    .boxed(),
+            )
+            .with_child(
+                Label::new("Send Feedback", style.label.clone())
                    .aligned()
                    .contained()
                    .boxed(),
@@ -323,16 +334,16 @@ impl Item for FeedbackEditor {
        Some(Box::new(handle.clone()))
    }

-    fn act_as_type(
-        &self,
+    fn act_as_type<'a>(
+        &'a self,
        type_id: TypeId,
-        self_handle: &ViewHandle<Self>,
-        _: &AppContext,
-    ) -> Option<AnyViewHandle> {
+        self_handle: &'a ViewHandle<Self>,
+        _: &'a AppContext,
+    ) -> Option<&'a AnyViewHandle> {
        if type_id == TypeId::of::<Self>() {
-            Some(self_handle.into())
+            Some(self_handle)
        } else if type_id == TypeId::of::<Editor>() {
-            Some((&self.editor).into())
+            Some(&self.editor)
        } else {
            None
        }
--- a/crates/feedback/src/feedback_info_text.rs
+++ b/crates/feedback/src/feedback_info_text.rs
@@ -1,7 +1,7 @@
 use gpui::{
    elements::{Flex, Label, MouseEventHandler, ParentElement, Text},
-    CursorStyle, Element, ElementBox, Entity, MouseButton, RenderContext, View, ViewContext,
-    ViewHandle,
+    platform::{CursorStyle, MouseButton},
+    Element, ElementBox, Entity, RenderContext, View, ViewContext, ViewHandle,
 };
 use settings::Settings;
 use workspace::{item::ItemHandle, ToolbarItemLocation, ToolbarItemView};
--- a/crates/feedback/src/submit_feedback_button.rs
+++ b/crates/feedback/src/submit_feedback_button.rs
@@ -1,7 +1,7 @@
 use gpui::{
    elements::{Label, MouseEventHandler},
-    CursorStyle, Element, ElementBox, Entity, MouseButton, RenderContext, View, ViewContext,
-    ViewHandle,
+    platform::{CursorStyle, MouseButton},
+    Element, ElementBox, Entity, RenderContext, View, ViewContext, ViewHandle,
 };
 use settings::Settings;
 use workspace::{item::ItemHandle, ToolbarItemLocation, ToolbarItemView};
--- a/crates/feedback/src/system_specs.rs
+++ b/crates/feedback/src/system_specs.rs
@@ -1,5 +1,5 @@
 use client::ZED_APP_VERSION;
-use gpui::{AppContext, AppVersion};
+use gpui::{platform::AppVersion, AppContext};
 use human_bytes::human_bytes;
 use serde::Serialize;
 use std::{env, fmt::Display};
--- a/crates/file_finder/Cargo.toml
+++ b/crates/file_finder/Cargo.toml
@@ -19,11 +19,11 @@ settings = { path = "../settings" }
 util = { path = "../util" }
 theme = { path = "../theme" }
 workspace = { path = "../workspace" }
-postage = { version = "0.4.1", features = ["futures-traits"] }
+postage = { workspace = true }

 [dev-dependencies]
 gpui = { path = "../gpui", features = ["test-support"] }
-serde_json = { version = "1.0", features = ["preserve_order"] }
+serde_json = { workspace = true }
 workspace = { path = "../workspace", features = ["test-support"] }
 ctor = "0.1"
 env_logger = "0.9"
--- a/crates/file_finder/src/file_finder.rs
+++ b/crates/file_finder/src/file_finder.rs
@@ -1,7 +1,7 @@
 use fuzzy::PathMatch;
 use gpui::{
    actions, elements::*, AnyViewHandle, AppContext, Entity, ModelHandle, MouseState,
-    MutableAppContext, RenderContext, Task, View, ViewContext, ViewHandle,
+    RenderContext, Task, View, ViewContext, ViewHandle,
 };
 use picker::{Picker, PickerDelegate};
 use project::{PathMatchCandidateSet, Project, ProjectPath, WorktreeId};
@@ -31,7 +31,7 @@ pub struct FileFinder {

 actions!(file_finder, [Toggle]);

-pub fn init(cx: &mut MutableAppContext) {
+pub fn init(cx: &mut AppContext) {
    cx.add_action(FileFinder::toggle);
    Picker::<FileFinder>::init(cx);
 }
@@ -51,7 +51,7 @@ impl View for FileFinder {
    }

    fn render(&mut self, cx: &mut RenderContext<Self>) -> ElementBox {
-        ChildView::new(self.picker.clone(), cx).boxed()
+        ChildView::new(&self.picker, cx).boxed()
    }

    fn focus_in(&mut self, _: AnyViewHandle, cx: &mut ViewContext<Self>) {
@@ -352,8 +352,8 @@ mod tests {
            let active_item = active_pane.read(cx).active_item().unwrap();
            assert_eq!(
                active_item
-                    .to_any()
-                    .downcast::<Editor>()
+                    .as_any()
+                    .downcast_ref::<Editor>()
                    .unwrap()
                    .read(cx)
                    .title(cx),
--- a/crates/fs/Cargo.toml
+++ b/crates/fs/Cargo.toml
@@ -24,6 +24,7 @@ smol = "1.2.5"
 regex = "1.5"
 git2 = { version = "0.15", default-features = false }
 serde = { workspace = true }
+serde_derive = { workspace = true }
 serde_json = { workspace = true }
 log = { version = "0.4.16", features = ["kv_unstable_serde"] }
 libc = "0.2"
--- a/crates/fs/src/fs.rs
+++ b/crates/fs/src/fs.rs
@@ -5,7 +5,7 @@ use fsevent::EventStream;
 use futures::{future::BoxFuture, Stream, StreamExt};
 use git2::Repository as LibGitRepository;
 use lazy_static::lazy_static;
-use parking_lot::Mutex as SyncMutex;
+use parking_lot::Mutex;
 use regex::Regex;
 use repository::GitRepository;
 use rope::Rope;
@@ -27,8 +27,6 @@ use util::ResultExt;
 #[cfg(any(test, feature = "test-support"))]
 use collections::{btree_map, BTreeMap};
 #[cfg(any(test, feature = "test-support"))]
-use futures::lock::Mutex;
-#[cfg(any(test, feature = "test-support"))]
 use repository::FakeGitRepositoryState;
 #[cfg(any(test, feature = "test-support"))]
 use std::sync::Weak;
@@ -117,7 +115,7 @@ pub trait Fs: Send + Sync {
        path: &Path,
        latency: Duration,
    ) -> Pin<Box<dyn Send + Stream<Item = Vec<fsevent::Event>>>>;
-    fn open_repo(&self, abs_dot_git: &Path) -> Option<Arc<SyncMutex<dyn GitRepository>>>;
+    fn open_repo(&self, abs_dot_git: &Path) -> Option<Arc<Mutex<dyn GitRepository>>>;
    fn is_fake(&self) -> bool;
    #[cfg(any(test, feature = "test-support"))]
    fn as_fake(&self) -> &FakeFs;
@@ -350,11 +348,11 @@ impl Fs for RealFs {
        })))
    }

-    fn open_repo(&self, dotgit_path: &Path) -> Option<Arc<SyncMutex<dyn GitRepository>>> {
+    fn open_repo(&self, dotgit_path: &Path) -> Option<Arc<Mutex<dyn GitRepository>>> {
        LibGitRepository::open(&dotgit_path)
            .log_err()
-            .and_then::<Arc<SyncMutex<dyn GitRepository>>, _>(|libgit_repository| {
-                Some(Arc::new(SyncMutex::new(libgit_repository)))
+            .and_then::<Arc<Mutex<dyn GitRepository>>, _>(|libgit_repository| {
+                Some(Arc::new(Mutex::new(libgit_repository)))
            })
    }

@@ -380,6 +378,8 @@ struct FakeFsState {
    next_inode: u64,
    next_mtime: SystemTime,
    event_txs: Vec<smol::channel::Sender<Vec<fsevent::Event>>>,
+    events_paused: bool,
+    buffered_events: Vec<fsevent::Event>,
 }

 #[cfg(any(test, feature = "test-support"))]
@@ -394,7 +394,7 @@ enum FakeFsEntry {
        inode: u64,
        mtime: SystemTime,
        entries: BTreeMap<String, Arc<Mutex<FakeFsEntry>>>,
-        git_repo_state: Option<Arc<SyncMutex<repository::FakeGitRepositoryState>>>,
+        git_repo_state: Option<Arc<Mutex<repository::FakeGitRepositoryState>>>,
    },
    Symlink {
        target: PathBuf,
@@ -403,18 +403,14 @@ enum FakeFsEntry {

 #[cfg(any(test, feature = "test-support"))]
 impl FakeFsState {
-    async fn read_path<'a>(&'a self, target: &Path) -> Result<Arc<Mutex<FakeFsEntry>>> {
+    fn read_path<'a>(&'a self, target: &Path) -> Result<Arc<Mutex<FakeFsEntry>>> {
        Ok(self
            .try_read_path(target)
-            .await
            .ok_or_else(|| anyhow!("path does not exist: {}", target.display()))?
            .0)
    }

-    async fn try_read_path<'a>(
-        &'a self,
-        target: &Path,
-    ) -> Option<(Arc<Mutex<FakeFsEntry>>, PathBuf)> {
+    fn try_read_path<'a>(&'a self, target: &Path) -> Option<(Arc<Mutex<FakeFsEntry>>, PathBuf)> {
        let mut path = target.to_path_buf();
        let mut real_path = PathBuf::new();
        let mut entry_stack = Vec::new();
@@ -436,10 +432,10 @@ impl FakeFsState {
                    }
                    Component::Normal(name) => {
                        let current_entry = entry_stack.last().cloned()?;
-                        let current_entry = current_entry.lock().await;
+                        let current_entry = current_entry.lock();
                        if let FakeFsEntry::Dir { entries, .. } = &*current_entry {
                            let entry = entries.get(name.to_str().unwrap()).cloned()?;
-                            let _entry = entry.lock().await;
+                            let _entry = entry.lock();
                            if let FakeFsEntry::Symlink { target, .. } = &*_entry {
                                let mut target = target.clone();
                                target.extend(path_components);
@@ -460,7 +456,7 @@ impl FakeFsState {
        entry_stack.pop().map(|entry| (entry, real_path))
    }

-    async fn write_path<Fn, T>(&self, path: &Path, callback: Fn) -> Result<T>
+    fn write_path<Fn, T>(&self, path: &Path, callback: Fn) -> Result<T>
    where
        Fn: FnOnce(btree_map::Entry<String, Arc<Mutex<FakeFsEntry>>>) -> Result<T>,
    {
@@ -470,8 +466,8 @@ impl FakeFsState {
            .ok_or_else(|| anyhow!("cannot overwrite the root"))?;
        let parent_path = path.parent().unwrap();

-        let parent = self.read_path(parent_path).await?;
-        let mut parent = parent.lock().await;
+        let parent = self.read_path(parent_path)?;
+        let mut parent = parent.lock();
        let new_entry = parent
            .dir_entries(parent_path)?
            .entry(filename.to_str().unwrap().into());
@@ -483,15 +479,21 @@ impl FakeFsState {
        I: IntoIterator<Item = T>,
        T: Into<PathBuf>,
    {
-        let events = paths
-            .into_iter()
-            .map(|path| fsevent::Event {
+        self.buffered_events
+            .extend(paths.into_iter().map(|path| fsevent::Event {
                event_id: 0,
                flags: fsevent::StreamFlags::empty(),
                path: path.into(),
-            })
-            .collect::<Vec<_>>();
+            }));

+        if !self.events_paused {
+            self.flush_events(self.buffered_events.len());
+        }
+    }
+
+    fn flush_events(&mut self, mut count: usize) {
+        count = count.min(self.buffered_events.len());
+        let events = self.buffered_events.drain(0..count).collect::<Vec<_>>();
        self.event_txs.retain(|tx| {
            let _ = tx.try_send(events.clone());
            !tx.is_closed()
@@ -514,12 +516,14 @@ impl FakeFs {
                next_mtime: SystemTime::UNIX_EPOCH,
                next_inode: 1,
                event_txs: Default::default(),
+                buffered_events: Vec::new(),
+                events_paused: false,
            }),
        })
    }

    pub async fn insert_file(&self, path: impl AsRef<Path>, content: String) {
-        let mut state = self.state.lock().await;
+        let mut state = self.state.lock();
        let path = path.as_ref();
        let inode = state.next_inode;
        let mtime = state.next_mtime;
@@ -542,13 +546,12 @@ impl FakeFs {
                }
                Ok(())
            })
-            .await
            .unwrap();
        state.emit_event(&[path]);
    }

    pub async fn insert_symlink(&self, path: impl AsRef<Path>, target: PathBuf) {
-        let mut state = self.state.lock().await;
+        let mut state = self.state.lock();
        let path = path.as_ref();
        let file = Arc::new(Mutex::new(FakeFsEntry::Symlink { target }));
        state
@@ -562,11 +565,22 @@ impl FakeFs {
                    Ok(())
                }
            })
-            .await
            .unwrap();
        state.emit_event(&[path]);
    }

+    pub async fn pause_events(&self) {
+        self.state.lock().events_paused = true;
+    }
+
+    pub async fn buffered_event_count(&self) -> usize {
+        self.state.lock().buffered_events.len()
+    }
+
+    pub async fn flush_events(&self, count: usize) {
+        self.state.lock().flush_events(count);
+    }
+
    #[must_use]
    pub fn insert_tree<'a>(
        &'a self,
@@ -603,9 +617,9 @@ impl FakeFs {
    }

    pub async fn set_index_for_repo(&self, dot_git: &Path, head_state: &[(&Path, String)]) {
-        let mut state = self.state.lock().await;
-        let entry = state.read_path(dot_git).await.unwrap();
-        let mut entry = entry.lock().await;
+        let mut state = self.state.lock();
+        let entry = state.read_path(dot_git).unwrap();
+        let mut entry = entry.lock();

        if let FakeFsEntry::Dir { git_repo_state, .. } = &mut *entry {
            let repo_state = git_repo_state.get_or_insert_with(Default::default);
@@ -624,12 +638,12 @@ impl FakeFs {
        }
    }

-    pub async fn paths(&self) -> Vec<PathBuf> {
+    pub fn paths(&self) -> Vec<PathBuf> {
        let mut result = Vec::new();
        let mut queue = collections::VecDeque::new();
-        queue.push_back((PathBuf::from("/"), self.state.lock().await.root.clone()));
+        queue.push_back((PathBuf::from("/"), self.state.lock().root.clone()));
        while let Some((path, entry)) = queue.pop_front() {
-            if let FakeFsEntry::Dir { entries, .. } = &*entry.lock().await {
+            if let FakeFsEntry::Dir { entries, .. } = &*entry.lock() {
                for (name, entry) in entries {
                    queue.push_back((path.join(name), entry.clone()));
                }
@@ -639,12 +653,12 @@ impl FakeFs {
        result
    }

-    pub async fn directories(&self) -> Vec<PathBuf> {
+    pub fn directories(&self) -> Vec<PathBuf> {
        let mut result = Vec::new();
        let mut queue = collections::VecDeque::new();
-        queue.push_back((PathBuf::from("/"), self.state.lock().await.root.clone()));
+        queue.push_back((PathBuf::from("/"), self.state.lock().root.clone()));
        while let Some((path, entry)) = queue.pop_front() {
-            if let FakeFsEntry::Dir { entries, .. } = &*entry.lock().await {
+            if let FakeFsEntry::Dir { entries, .. } = &*entry.lock() {
                for (name, entry) in entries {
                    queue.push_back((path.join(name), entry.clone()));
                }
@@ -654,12 +668,12 @@ impl FakeFs {
        result
    }

-    pub async fn files(&self) -> Vec<PathBuf> {
+    pub fn files(&self) -> Vec<PathBuf> {
        let mut result = Vec::new();
        let mut queue = collections::VecDeque::new();
-        queue.push_back((PathBuf::from("/"), self.state.lock().await.root.clone()));
+        queue.push_back((PathBuf::from("/"), self.state.lock().root.clone()));
        while let Some((path, entry)) = queue.pop_front() {
-            let e = entry.lock().await;
+            let e = entry.lock();
            match &*e {
                FakeFsEntry::File { .. } => result.push(path),
                FakeFsEntry::Dir { entries, .. } => {
@@ -723,11 +737,11 @@ impl FakeFsEntry {
 impl Fs for FakeFs {
    async fn create_dir(&self, path: &Path) -> Result<()> {
        self.simulate_random_delay().await;
-        let mut state = self.state.lock().await;

        let mut created_dirs = Vec::new();
        let mut cur_path = PathBuf::new();
        for component in path.components() {
+            let mut state = self.state.lock();
            cur_path.push(component);
            if cur_path == Path::new("/") {
                continue;
@@ -737,29 +751,27 @@ impl Fs for FakeFs {
            let mtime = state.next_mtime;
            state.next_mtime += Duration::from_nanos(1);
            state.next_inode += 1;
-            state
-                .write_path(&cur_path, |entry| {
-                    entry.or_insert_with(|| {
-                        created_dirs.push(cur_path.clone());
-                        Arc::new(Mutex::new(FakeFsEntry::Dir {
-                            inode,
-                            mtime,
-                            entries: Default::default(),
-                            git_repo_state: None,
-                        }))
-                    });
-                    Ok(())
-                })
-                .await?;
+            state.write_path(&cur_path, |entry| {
+                entry.or_insert_with(|| {
+                    created_dirs.push(cur_path.clone());
+                    Arc::new(Mutex::new(FakeFsEntry::Dir {
+                        inode,
+                        mtime,
+                        entries: Default::default(),
+                        git_repo_state: None,
+                    }))
+                });
+                Ok(())
+            })?
        }

-        state.emit_event(&created_dirs);
+        self.state.lock().emit_event(&created_dirs);
        Ok(())
    }

    async fn create_file(&self, path: &Path, options: CreateOptions) -> Result<()> {
        self.simulate_random_delay().await;
-        let mut state = self.state.lock().await;
+        let mut state = self.state.lock();
        let inode = state.next_inode;
        let mtime = state.next_mtime;
        state.next_mtime += Duration::from_nanos(1);
@@ -769,108 +781,106 @@ impl Fs for FakeFs {
            mtime,
            content: String::new(),
        }));
-        state
-            .write_path(path, |entry| {
-                match entry {
-                    btree_map::Entry::Occupied(mut e) => {
-                        if options.overwrite {
-                            *e.get_mut() = file;
-                        } else if !options.ignore_if_exists {
-                            return Err(anyhow!("path already exists: {}", path.display()));
-                        }
-                    }
-                    btree_map::Entry::Vacant(e) => {
-                        e.insert(file);
+        state.write_path(path, |entry| {
+            match entry {
+                btree_map::Entry::Occupied(mut e) => {
+                    if options.overwrite {
+                        *e.get_mut() = file;
+                    } else if !options.ignore_if_exists {
+                        return Err(anyhow!("path already exists: {}", path.display()));
                    }
                }
-                Ok(())
-            })
-            .await?;
+                btree_map::Entry::Vacant(e) => {
+                    e.insert(file);
+                }
+            }
+            Ok(())
+        })?;
        state.emit_event(&[path]);
        Ok(())
    }

    async fn rename(&self, old_path: &Path, new_path: &Path, options: RenameOptions) -> Result<()> {
+        self.simulate_random_delay().await;
+
        let old_path = normalize_path(old_path);
        let new_path = normalize_path(new_path);
-        let mut state = self.state.lock().await;
-        let moved_entry = state
-            .write_path(&old_path, |e| {
-                if let btree_map::Entry::Occupied(e) = e {
-                    Ok(e.remove())
-                } else {
-                    Err(anyhow!("path does not exist: {}", &old_path.display()))
-                }
-            })
-            .await?;
-        state
-            .write_path(&new_path, |e| {
-                match e {
-                    btree_map::Entry::Occupied(mut e) => {
-                        if options.overwrite {
-                            *e.get_mut() = moved_entry;
-                        } else if !options.ignore_if_exists {
-                            return Err(anyhow!("path already exists: {}", new_path.display()));
-                        }
-                    }
-                    btree_map::Entry::Vacant(e) => {
-                        e.insert(moved_entry);
+        let mut state = self.state.lock();
+        let moved_entry = state.write_path(&old_path, |e| {
+            if let btree_map::Entry::Occupied(e) = e {
+                Ok(e.remove())
+            } else {
+                Err(anyhow!("path does not exist: {}", &old_path.display()))
+            }
+        })?;
+        state.write_path(&new_path, |e| {
+            match e {
+                btree_map::Entry::Occupied(mut e) => {
+                    if options.overwrite {
+                        *e.get_mut() = moved_entry;
+                    } else if !options.ignore_if_exists {
+                        return Err(anyhow!("path already exists: {}", new_path.display()));
                    }
                }
-                Ok(())
-            })
-            .await?;
+                btree_map::Entry::Vacant(e) => {
+                    e.insert(moved_entry);
+                }
+            }
+            Ok(())
+        })?;
        state.emit_event(&[old_path, new_path]);
        Ok(())
    }

    async fn copy_file(&self, source: &Path, target: &Path, options: CopyOptions) -> Result<()> {
+        self.simulate_random_delay().await;
+
        let source = normalize_path(source);
        let target = normalize_path(target);
-        let mut state = self.state.lock().await;
+        let mut state = self.state.lock();
        let mtime = state.next_mtime;
        let inode = util::post_inc(&mut state.next_inode);
        state.next_mtime += Duration::from_nanos(1);
-        let source_entry = state.read_path(&source).await?;
-        let content = source_entry.lock().await.file_content(&source)?.clone();
-        let entry = state
-            .write_path(&target, |e| match e {
-                btree_map::Entry::Occupied(e) => {
-                    if options.overwrite {
-                        Ok(Some(e.get().clone()))
-                    } else if !options.ignore_if_exists {
-                        return Err(anyhow!("{target:?} already exists"));
-                    } else {
-                        Ok(None)
-                    }
+        let source_entry = state.read_path(&source)?;
+        let content = source_entry.lock().file_content(&source)?.clone();
+        let entry = state.write_path(&target, |e| match e {
+            btree_map::Entry::Occupied(e) => {
+                if options.overwrite {
+                    Ok(Some(e.get().clone()))
+                } else if !options.ignore_if_exists {
+                    return Err(anyhow!("{target:?} already exists"));
+                } else {
+                    Ok(None)
                }
-                btree_map::Entry::Vacant(e) => Ok(Some(
-                    e.insert(Arc::new(Mutex::new(FakeFsEntry::File {
-                        inode,
-                        mtime,
-                        content: String::new(),
-                    })))
-                    .clone(),
-                )),
-            })
-            .await?;
+            }
+            btree_map::Entry::Vacant(e) => Ok(Some(
+                e.insert(Arc::new(Mutex::new(FakeFsEntry::File {
+                    inode,
+                    mtime,
+                    content: String::new(),
+                })))
+                .clone(),
+            )),
+        })?;
        if let Some(entry) = entry {
-            entry.lock().await.set_file_content(&target, content)?;
+            entry.lock().set_file_content(&target, content)?;
        }
        state.emit_event(&[target]);
        Ok(())
    }

    async fn remove_dir(&self, path: &Path, options: RemoveOptions) -> Result<()> {
+        self.simulate_random_delay().await;
+
        let path = normalize_path(path);
        let parent_path = path
            .parent()
            .ok_or_else(|| anyhow!("cannot remove the root"))?;
        let base_name = path.file_name().unwrap();

-        let state = self.state.lock().await;
-        let parent_entry = state.read_path(parent_path).await?;
-        let mut parent_entry = parent_entry.lock().await;
+        let mut state = self.state.lock();
+        let parent_entry = state.read_path(parent_path)?;
+        let mut parent_entry = parent_entry.lock();
        let entry = parent_entry
            .dir_entries(parent_path)?
            .entry(base_name.to_str().unwrap().into());
@@ -883,7 +893,7 @@ impl Fs for FakeFs {
            }
            btree_map::Entry::Occupied(e) => {
                {
-                    let mut entry = e.get().lock().await;
+                    let mut entry = e.get().lock();
                    let children = entry.dir_entries(&path)?;
                    if !options.recursive && !children.is_empty() {
                        return Err(anyhow!("{path:?} is not empty"));
@@ -892,19 +902,21 @@ impl Fs for FakeFs {
                e.remove();
            }
        }
-
+        state.emit_event(&[path]);
        Ok(())
    }

    async fn remove_file(&self, path: &Path, options: RemoveOptions) -> Result<()> {
+        self.simulate_random_delay().await;
+
        let path = normalize_path(path);
        let parent_path = path
            .parent()
            .ok_or_else(|| anyhow!("cannot remove the root"))?;
        let base_name = path.file_name().unwrap();
-        let mut state = self.state.lock().await;
-        let parent_entry = state.read_path(parent_path).await?;
-        let mut parent_entry = parent_entry.lock().await;
+        let mut state = self.state.lock();
+        let parent_entry = state.read_path(parent_path)?;
+        let mut parent_entry = parent_entry.lock();
        let entry = parent_entry
            .dir_entries(parent_path)?
            .entry(base_name.to_str().unwrap().into());
@@ -915,7 +927,7 @@ impl Fs for FakeFs {
                }
            }
            btree_map::Entry::Occupied(e) => {
-                e.get().lock().await.file_content(&path)?;
+                e.get().lock().file_content(&path)?;
                e.remove();
            }
        }
@@ -931,9 +943,9 @@ impl Fs for FakeFs {
    async fn load(&self, path: &Path) -> Result<String> {
        let path = normalize_path(path);
        self.simulate_random_delay().await;
-        let state = self.state.lock().await;
-        let entry = state.read_path(&path).await?;
-        let entry = entry.lock().await;
+        let state = self.state.lock();
+        let entry = state.read_path(&path)?;
+        let entry = entry.lock();
        entry.file_content(&path).cloned()
    }

@@ -956,8 +968,8 @@ impl Fs for FakeFs {
    async fn canonicalize(&self, path: &Path) -> Result<PathBuf> {
        let path = normalize_path(path);
        self.simulate_random_delay().await;
-        let state = self.state.lock().await;
-        if let Some((_, real_path)) = state.try_read_path(&path).await {
+        let state = self.state.lock();
+        if let Some((_, real_path)) = state.try_read_path(&path) {
            Ok(real_path)
        } else {
            Err(anyhow!("path does not exist: {}", path.display()))
@@ -967,9 +979,9 @@ impl Fs for FakeFs {
    async fn is_file(&self, path: &Path) -> bool {
        let path = normalize_path(path);
        self.simulate_random_delay().await;
-        let state = self.state.lock().await;
-        if let Some((entry, _)) = state.try_read_path(&path).await {
-            entry.lock().await.is_file()
+        let state = self.state.lock();
+        if let Some((entry, _)) = state.try_read_path(&path) {
+            entry.lock().is_file()
        } else {
            false
        }
@@ -978,9 +990,9 @@ impl Fs for FakeFs {
    async fn metadata(&self, path: &Path) -> Result<Option<Metadata>> {
        self.simulate_random_delay().await;
        let path = normalize_path(path);
-        let state = self.state.lock().await;
-        if let Some((entry, real_path)) = state.try_read_path(&path).await {
-            let entry = entry.lock().await;
+        let state = self.state.lock();
+        if let Some((entry, real_path)) = state.try_read_path(&path) {
+            let entry = entry.lock();
            let is_symlink = real_path != path;

            Ok(Some(match &*entry {
@@ -1009,9 +1021,9 @@ impl Fs for FakeFs {
    ) -> Result<Pin<Box<dyn Send + Stream<Item = Result<PathBuf>>>>> {
        self.simulate_random_delay().await;
        let path = normalize_path(path);
-        let state = self.state.lock().await;
-        let entry = state.read_path(&path).await?;
-        let mut entry = entry.lock().await;
+        let state = self.state.lock();
+        let entry = state.read_path(&path)?;
+        let mut entry = entry.lock();
        let children = entry.dir_entries(&path)?;
        let paths = children
            .keys()
@@ -1025,10 +1037,9 @@ impl Fs for FakeFs {
        path: &Path,
        _: Duration,
    ) -> Pin<Box<dyn Send + Stream<Item = Vec<fsevent::Event>>>> {
-        let mut state = self.state.lock().await;
        self.simulate_random_delay().await;
        let (tx, rx) = smol::channel::unbounded();
-        state.event_txs.push(tx);
+        self.state.lock().event_txs.push(tx);
        let path = path.to_path_buf();
        let executor = self.executor.clone();
        Box::pin(futures::StreamExt::filter(rx, move |events| {
@@ -1043,22 +1054,18 @@ impl Fs for FakeFs {
        }))
    }

-    fn open_repo(&self, abs_dot_git: &Path) -> Option<Arc<SyncMutex<dyn GitRepository>>> {
-        smol::block_on(async move {
-            let state = self.state.lock().await;
-            let entry = state.read_path(abs_dot_git).await.unwrap();
-            let mut entry = entry.lock().await;
-            if let FakeFsEntry::Dir { git_repo_state, .. } = &mut *entry {
-                let state = git_repo_state
-                    .get_or_insert_with(|| {
-                        Arc::new(SyncMutex::new(FakeGitRepositoryState::default()))
-                    })
-                    .clone();
-                Some(repository::FakeGitRepository::open(state))
-            } else {
-                None
-            }
-        })
+    fn open_repo(&self, abs_dot_git: &Path) -> Option<Arc<Mutex<dyn GitRepository>>> {
+        let state = self.state.lock();
+        let entry = state.read_path(abs_dot_git).unwrap();
+        let mut entry = entry.lock();
+        if let FakeFsEntry::Dir { git_repo_state, .. } = &mut *entry {
+            let state = git_repo_state
+                .get_or_insert_with(|| Arc::new(Mutex::new(FakeGitRepositoryState::default())))
+                .clone();
+            Some(repository::FakeGitRepository::open(state))
+        } else {
+            None
+        }
    }

    fn is_fake(&self) -> bool {
@@ -1191,7 +1198,7 @@ mod tests {
        .await;

        assert_eq!(
-            fs.files().await,
+            fs.files(),
            vec![
                PathBuf::from("/root/dir1/a"),
                PathBuf::from("/root/dir1/b"),
--- a/Show More
+++ b/Show More
				`@@ -0,0 +1 @@`
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