v0.81.x preview

Merge pull request #2357 from zed-industries/update-eula
Update EULA
2023-04-05 13:00:39 -04:00 · 2023-04-05 12:57:34 -04:00 · 2023-04-05 12:45:48 -04:00 · 2023-04-05 12:16:30 -04:00 · 2023-04-05 12:08:52 -04:00 · 2023-04-05 08:59:30 -07:00
162 changed files with 5280 additions and 2958 deletions
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -785,6 +785,7 @@ dependencies = [
 "gpui",
 "itertools",
 "language",
+ "outline",
 "project",
 "search",
 "settings",
@@ -1113,7 +1114,6 @@ dependencies = [
 "futures 0.3.25",
 "gpui",
 "image",
- "isahc",
 "lazy_static",
 "log",
 "parking_lot 0.11.2",
@@ -1124,6 +1124,7 @@ dependencies = [
 "serde_derive",
 "settings",
 "smol",
+ "staff_mode",
 "sum_tree",
 "tempfile",
 "thiserror",
@@ -1332,6 +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"
@@ -1932,6 +1974,7 @@ dependencies = [
 "clock",
 "collections",
 "context_menu",
+ "copilot",
 "ctor",
 "db",
 "drag_and_drop",
@@ -3910,6 +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"
@@ -5014,6 +5074,7 @@ dependencies = [
 "settings",
 "smol",
 "text",
+ "util",
 "workspace",
 ]

@@ -5882,12 +5943,14 @@ dependencies = [
 "gpui",
 "json_comments",
 "postage",
+ "pretty_assertions",
 "schemars",
 "serde",
 "serde_derive",
 "serde_json",
 "serde_path_to_error",
 "sqlez",
+ "staff_mode",
 "theme",
 "toml",
 "tree-sitter",
@@ -6298,6 +6361,14 @@ 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"
@@ -6616,6 +6687,7 @@ dependencies = [
 "postage",
 "settings",
 "smol",
+ "staff_mode",
 "theme",
 "util",
 "workspace",
@@ -7500,11 +7572,15 @@ 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]]
@@ -8439,7 +8515,7 @@ checksum = "09041cd90cf85f7f8b2df60c646f853b7f535ce68f85244eb6731cf89fa498ec"

 [[package]]
 name = "zed"
-version = "0.80.0"
+version = "0.81.0"
 dependencies = [
 "activity_indicator",
 "anyhow",
@@ -8460,6 +8536,8 @@ dependencies = [
 "collections",
 "command_palette",
 "context_menu",
+ "copilot",
+ "copilot_button",
 "ctor",
 "db",
 "diagnostics",
@@ -8486,6 +8564,7 @@ dependencies = [
 "libc",
 "log",
 "lsp",
+ "node_runtime",
 "num_cpus",
 "outline",
 "parking_lot 0.11.2",
@@ -8509,6 +8588,7 @@ dependencies = [
 "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",
--- 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/copilot_disabled_16.svg
+++ b/assets/icons/copilot_disabled_16.svg
@@ -0,0 +1,9 @@
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--- a/assets/icons/copilot_error_16.svg
+++ b/assets/icons/copilot_error_16.svg
@@ -0,0 +1,7 @@
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+</svg>
--- 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"
        }
    },
    {
--- a/assets/settings/default.json
+++ b/assets/settings/default.json
@@ -13,6 +13,11 @@
    // 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
@@ -120,7 +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/auto_update/Cargo.toml
+++ b/crates/auto_update/Cargo.toml
@@ -22,8 +22,8 @@ anyhow = "1.0.38"
 isahc = "1.7"
 lazy_static = "1.4"
 log = "0.4"
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
-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
@@ -1,8 +1,7 @@
 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,
@@ -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";
--- 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::*, AppContext, Entity, MouseButton, 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::MutableAppContext) {
+        self.pane_focused = pane_focused;
+    }
 }
--- a/crates/cli/Cargo.toml
+++ b/crates/cli/Cargo.toml
@@ -17,8 +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_derive = { version = "1.0", features = ["deserialize_in_place"] }
+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
@@ -17,13 +17,13 @@ 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"
@@ -35,8 +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", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 settings = { path = "../settings" }
 tempfile = "3"

--- 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;

@@ -18,7 +17,6 @@ use gpui::{
    AnyModelHandle, AnyViewHandle, AnyWeakModelHandle, AnyWeakViewHandle, AppContext, AppVersion,
    AsyncAppContext, Entity, ModelHandle, MutableAppContext, Task, View, ViewContext, ViewHandle,
 };
-use http::HttpClient;
 use lazy_static::lazy_static;
 use parking_lot::RwLock;
 use postage::watch;
@@ -41,6 +39,7 @@ use telemetry::Telemetry;
 use thiserror::Error;
 use url::Url;
 use util::channel::ReleaseChannel;
+use util::http::HttpClient;
 use util::{ResultExt, TryFutureExt};

 pub use rpc::*;
@@ -130,7 +129,7 @@ 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 +293,7 @@ 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 +460,7 @@ 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,
@@ -505,7 +504,7 @@ 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,
@@ -1396,10 +1395,11 @@ 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) {
--- 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
@@ -41,9 +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_derive = { version = "1.0", features = ["deserialize_in_place"] }
-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"] }
@@ -79,7 +79,7 @@ env_logger = "0.9"
 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/tests.rs
+++ b/crates/collab/src/tests.rs
@@ -7,8 +7,7 @@ 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;
@@ -28,6 +27,7 @@ use std::{
    },
 };
 use theme::ThemeRegistry;
+use util::http::FakeHttpClient;
 use workspace::Workspace;

 mod integration_tests;
--- a/crates/collab_ui/Cargo.toml
+++ b/crates/collab_ui/Cargo.toml
@@ -43,8 +43,8 @@ anyhow = "1.0"
 futures = "0.3"
 log = "0.4"
 postage = { workspace = true }
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+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
@@ -301,25 +301,13 @@ impl CollabTitlebarItem {
                            .with_style(item_style.container)
                            .boxed()
                    })),
-                    ContextMenuItem::Item {
-                        label: "Sign out".into(),
-                        action: Box::new(SignOut),
-                    },
-                    ContextMenuItem::Item {
-                        label: "Send 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: "Send Feedback".into(),
-                        action: Box::new(feedback::feedback_editor::GiveFeedback),
-                    },
+                    ContextMenuItem::item("Sign in", SignIn),
+                    ContextMenuItem::item("Send Feedback", feedback::feedback_editor::GiveFeedback),
                ]
            };

--- a/crates/collab_ui/src/contact_finder.rs
+++ b/crates/collab_ui/src/contact_finder.rs
@@ -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
@@ -1339,7 +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/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
@@ -1,4 +1,4 @@
-use collections::HashSet;
+use collections::CommandPaletteFilter;
 use fuzzy::{StringMatch, StringMatchCandidate};
 use gpui::{
    actions,
@@ -12,11 +12,6 @@ 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) {
    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
@@ -1,7 +1,7 @@
 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,
+    MouseState, MutableAppContext, RenderContext, SizeConstraint, Subscription, View, ViewContext,
 };
 use menu::*;
 use settings::Settings;
@@ -24,20 +24,71 @@ 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 +219,15 @@ 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 +337,17 @@ 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 +372,18 @@ 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 +422,34 @@ 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 +462,12 @@ 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 +1,709 @@
+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, MutableAppContext,
+    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 MutableAppContext) {
+    // 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 +1,354 @@
+use crate::{request::PromptUserDeviceFlow, Copilot, Status};
+use gpui::{
+    elements::*, geometry::rect::RectF, ClipboardItem, Element, Entity, MutableAppContext, View,
+    ViewContext, ViewHandle, WindowKind, WindowOptions,
+};
+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 MutableAppContext) {
+    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 MutableAppContext,
+    status: &Status,
+    code_verification: &mut Option<ViewHandle<CopilotCodeVerification>>,
+) {
+    let window_size = cx.global::<Settings>().theme.copilot.modal.dimensions();
+    let window_options = WindowOptions {
+        bounds: gpui::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::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::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 +1,338 @@
+use std::sync::Arc;
+
+use context_menu::{ContextMenu, ContextMenuItem};
+use editor::Editor;
+use gpui::{
+    elements::*, impl_internal_actions, CursorStyle, Element, ElementBox, Entity, MouseButton,
+    MouseState, MutableAppContext, 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 MutableAppContext) {
+    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
@@ -23,8 +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_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 smol = "1.2"

 [dev-dependencies]
--- a/crates/diagnostics/Cargo.toml
+++ b/crates/diagnostics/Cargo.toml
@@ -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
@@ -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
        }
--- 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"
@@ -54,7 +57,7 @@ parking_lot = "0.11"
 postage = { workspace = true }
 rand = { version = "0.8.3", optional = true }
 serde = { workspace = true }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde_derive = { workspace = true }
 smallvec = { version = "1.6", features = ["union"] }
 smol = "1.2"
 tree-sitter-rust = { version = "*", optional = true }
@@ -63,6 +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/display_map.rs
+++ b/crates/editor/src/display_map.rs
@@ -7,7 +7,7 @@ mod wrap_map;
 use crate::{Anchor, AnchorRangeExt, MultiBuffer, MultiBufferSnapshot, ToOffset, ToPoint};
 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},
@@ -19,7 +19,7 @@ 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, TabSnapshot};
+use tab_map::TabMap;
 use wrap_map::WrapMap;

 pub use block_map::{
@@ -230,23 +230,30 @@ 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>,
-    ) where
+    ) -> 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) = self.suggestion_map.replace(new_suggestion, 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 {
@@ -382,7 +389,7 @@ impl DisplaySnapshot {
    /// 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.block_snapshot
-            .chunks(display_row..self.max_point().row() + 1, false, None)
+            .chunks(display_row..self.max_point().row() + 1, false, None, None)
            .map(|h| h.text)
    }

@@ -390,7 +397,7 @@ impl DisplaySnapshot {
    pub fn reverse_text_chunks(&self, display_row: u32) -> impl Iterator<Item = &str> {
        (0..=display_row).into_iter().rev().flat_map(|row| {
            self.block_snapshot
-                .chunks(row..row + 1, false, None)
+                .chunks(row..row + 1, false, None, None)
                .map(|h| h.text)
                .collect::<Vec<_>>()
                .into_iter()
@@ -398,9 +405,18 @@ impl DisplaySnapshot {
        })
    }

-    pub fn chunks(&self, display_rows: Range<u32>, language_aware: bool) -> DisplayChunks<'_> {
-        self.block_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(
@@ -634,25 +650,21 @@ impl DisplaySnapshot {
            .buffer_snapshot
            .buffer_line_for_row(buffer_row)
            .unwrap();
-        let chars = buffer.chars_at(Point::new(range.start.row, 0));

+        let mut indent_size = 0;
        let mut is_blank = false;
-        let indent_size = TabSnapshot::expand_tabs(
-            chars.take_while(|c| {
-                if *c == ' ' || *c == '\t' {
-                    true
-                } else {
-                    if *c == '\n' {
-                        is_blank = true;
-                    }
-                    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;
                }
-            }),
-            buffer.line_len(buffer_row) as usize, // Never collapse
-            self.tab_snapshot.tab_size,
-        );
+                break;
+            }
+        }

-        (indent_size as u32, is_blank)
+        (indent_size, is_blank)
    }

    pub fn line_len(&self, row: u32) -> u32 {
@@ -1691,7 +1703,7 @@ pub mod tests {
    ) -> 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,
@@ -1498,6 +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/suggestion_map.rs
+++ b/crates/editor/src/display_map/suggestion_map.rs
@@ -60,7 +60,6 @@ impl SuggestionPoint {
 pub struct Suggestion<T> {
    pub position: T,
    pub text: Rope,
-    pub highlight_style: HighlightStyle,
 }

 pub struct SuggestionMap(Mutex<SuggestionSnapshot>);
@@ -80,7 +79,11 @@ impl SuggestionMap {
        new_suggestion: Option<Suggestion<T>>,
        fold_snapshot: FoldSnapshot,
        fold_edits: Vec<FoldEdit>,
-    ) -> (SuggestionSnapshot, Vec<SuggestionEdit>)
+    ) -> (
+        SuggestionSnapshot,
+        Vec<SuggestionEdit>,
+        Option<Suggestion<FoldOffset>>,
+    )
    where
        T: ToPoint,
    {
@@ -93,7 +96,6 @@ impl SuggestionMap {
            Suggestion {
                position: fold_offset,
                text: new_suggestion.text,
-                highlight_style: new_suggestion.highlight_style,
            }
        });

@@ -101,7 +103,8 @@ impl SuggestionMap {
        let mut snapshot = self.0.lock();

        let mut patch = Patch::new(edits);
-        if let Some(suggestion) = snapshot.suggestion.take() {
+        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()),
@@ -121,7 +124,7 @@ impl SuggestionMap {

        snapshot.suggestion = new_suggestion;
        snapshot.version += 1;
-        (snapshot.clone(), patch.into_inner())
+        (snapshot.clone(), patch.into_inner(), old_suggestion)
    }

    pub fn sync(
@@ -173,6 +176,11 @@ impl SuggestionMap {

        (snapshot.clone(), suggestion_edits)
    }
+
+    pub fn has_suggestion(&self) -> bool {
+        let snapshot = self.0.lock();
+        snapshot.suggestion.is_some()
+    }
 }

 #[derive(Clone)]
@@ -210,6 +218,32 @@ impl SuggestionSnapshot {
        }
    }

+    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;
@@ -369,7 +403,7 @@ impl SuggestionSnapshot {

    pub fn chars_at(&self, start: SuggestionPoint) -> impl '_ + Iterator<Item = char> {
        let start = self.to_offset(start);
-        self.chunks(start..self.len(), false, None)
+        self.chunks(start..self.len(), false, None, None)
            .flat_map(|chunk| chunk.text.chars())
    }

@@ -378,6 +412,7 @@ impl SuggestionSnapshot {
        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 =
@@ -421,7 +456,7 @@ impl SuggestionSnapshot {
                prefix_chunks,
                suggestion_chunks,
                suffix_chunks,
-                highlight_style: suggestion.highlight_style,
+                highlight_style: suggestion_highlight,
            }
        } else {
            SuggestionChunks {
@@ -432,7 +467,7 @@ impl SuggestionSnapshot {
                )),
                suggestion_chunks: None,
                suffix_chunks: None,
-                highlight_style: Default::default(),
+                highlight_style: None,
            }
        }
    }
@@ -467,7 +502,7 @@ impl SuggestionSnapshot {

    #[cfg(test)]
    pub fn text(&self) -> String {
-        self.chunks(Default::default()..self.len(), false, None)
+        self.chunks(Default::default()..self.len(), false, None, None)
            .map(|chunk| chunk.text)
            .collect()
    }
@@ -477,7 +512,7 @@ pub struct SuggestionChunks<'a> {
    prefix_chunks: Option<FoldChunks<'a>>,
    suggestion_chunks: Option<text::Chunks<'a>>,
    suffix_chunks: Option<FoldChunks<'a>>,
-    highlight_style: HighlightStyle,
+    highlight_style: Option<HighlightStyle>,
 }

 impl<'a> Iterator for SuggestionChunks<'a> {
@@ -497,7 +532,7 @@ impl<'a> Iterator for SuggestionChunks<'a> {
                return Some(Chunk {
                    text: chunk,
                    syntax_highlight_id: None,
-                    highlight_style: Some(self.highlight_style),
+                    highlight_style: self.highlight_style,
                    diagnostic_severity: None,
                    is_unnecessary: false,
                });
@@ -559,11 +594,10 @@ mod tests {
        let (suggestion_map, suggestion_snapshot) = SuggestionMap::new(fold_snapshot.clone());
        assert_eq!(suggestion_snapshot.text(), "abcdefghi");

-        let (suggestion_snapshot, _) = suggestion_map.replace(
+        let (suggestion_snapshot, _, _) = suggestion_map.replace(
            Some(Suggestion {
                position: 3,
                text: "123\n456".into(),
-                highlight_style: Default::default(),
            }),
            fold_snapshot,
            Default::default(),
@@ -692,7 +726,12 @@ mod tests {
                start = expected_text.clip_offset(start, Bias::Right);

                let actual_text = suggestion_snapshot
-                    .chunks(SuggestionOffset(start)..SuggestionOffset(end), false, None)
+                    .chunks(
+                        SuggestionOffset(start)..SuggestionOffset(end),
+                        false,
+                        None,
+                        None,
+                    )
                    .map(|chunk| chunk.text)
                    .collect::<String>();
                assert_eq!(
@@ -816,12 +855,13 @@ mod tests {
                        .collect::<String>()
                        .as_str()
                        .into(),
-                    highlight_style: Default::default(),
                })
            };

            log::info!("replacing suggestion with {:?}", new_suggestion);
-            self.replace(new_suggestion, fold_snapshot, Default::default())
+            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
@@ -3,11 +3,14 @@ use super::{
    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 {
@@ -15,11 +18,18 @@ impl TabMap {
        let snapshot = TabSnapshot {
            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,
        suggestion_snapshot: SuggestionSnapshot,
@@ -30,6 +40,7 @@ impl TabMap {
        let mut new_snapshot = TabSnapshot {
            suggestion_snapshot,
            tab_size,
+            max_expansion_column: old_snapshot.max_expansion_column,
            version: old_snapshot.version,
        };

@@ -37,31 +48,66 @@ impl TabMap {
            new_snapshot.version += 1;
        }

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

        if old_snapshot.tab_size == new_snapshot.tab_size {
+            // 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 mut delta = 0;
-                for chunk in old_snapshot.suggestion_snapshot.chunks(
-                    suggestion_edit.old.end..old_max_offset,
+                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" {
-                            suggestion_edit.old.end.0 += delta + ix + 1;
-                            suggestion_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 < suggestion_edits.len() {
                let (prev_edits, next_edits) = suggestion_edits.split_at_mut(ix);
@@ -111,6 +157,7 @@ impl TabMap {
 pub struct TabSnapshot {
    pub suggestion_snapshot: SuggestionSnapshot,
    pub tab_size: NonZeroU32,
+    pub max_expansion_column: u32,
    pub version: usize,
 }

@@ -122,14 +169,12 @@ impl TabSnapshot {
    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()
        }
@@ -153,7 +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' {
@@ -167,7 +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;
@@ -188,15 +238,17 @@ 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_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
            .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 as u32) > range.end.0 {
-            (range.end.column() - range.start.column()) as usize
+        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
        };
@@ -206,16 +258,19 @@ impl TabSnapshot {
                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,
        }
    }

@@ -225,7 +280,7 @@ impl TabSnapshot {

    #[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()
    }
@@ -245,21 +300,17 @@ impl TabSnapshot {
        let chars = self
            .suggestion_snapshot
            .chars_at(SuggestionPoint::new(input.row(), 0));
-        let expanded = Self::expand_tabs(chars, input.column() as usize, self.tab_size);
-        TabPoint::new(input.row(), expanded as u32)
+        let expanded = self.expand_tabs(chars, input.column());
+        TabPoint::new(input.row(), expanded)
    }

-    pub fn to_suggestion_point(
-        &self,
-        output: TabPoint,
-        bias: Bias,
-    ) -> (SuggestionPoint, usize, 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() as usize;
+        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);
        (
            SuggestionPoint::new(output.row(), collapsed as u32),
            expanded_char_column,
@@ -282,38 +333,38 @@ impl TabSnapshot {
        fold_point.to_buffer_point(&self.suggestion_snapshot.fold_snapshot)
    }

-    pub 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;
@@ -321,9 +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;
@@ -336,7 +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) {
@@ -344,9 +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,
+        )
    }
 }

@@ -434,11 +491,13 @@ const SPACES: &str = "                ";
 pub struct TabChunks<'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> {
@@ -448,9 +507,10 @@ impl<'a> Iterator for TabChunks<'a> {
        if self.chunk.text.is_empty() {
            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;
@@ -469,27 +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;
                }
            }
@@ -508,20 +577,83 @@ mod tests {
    };
    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::MutableAppContext) {
+        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::MutableAppContext) {
+        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::MutableAppContext,
+    ) {
+        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)]
@@ -547,7 +679,9 @@ mod tests {
        let (suggestion_snapshot, _) = suggestion_map.randomly_mutate(&mut rng);
        log::info!("SuggestionMap text: {:?}", suggestion_snapshot.text());

-        let (_, tabs_snapshot) = TabMap::new(suggestion_snapshot.clone(), tab_size);
+        let (tab_map, _) = TabMap::new(suggestion_snapshot.clone(), tab_size);
+        let tabs_snapshot = tab_map.set_max_expansion_column(32);
+
        let text = text::Rope::from(tabs_snapshot.text().as_str());
        log::info!(
            "TabMap text (tab size: {}): {:?}",
@@ -572,11 +706,11 @@ 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
@@ -591,7 +725,11 @@ 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
@@ -5,8 +5,9 @@ use super::{
 };
 use crate::MultiBufferSnapshot;
 use gpui::{
-    fonts::FontId, text_layout::LineWrapper, Entity, ModelContext, ModelHandle, MutableAppContext,
-    Task,
+    fonts::{FontId, HighlightStyle},
+    text_layout::LineWrapper,
+    Entity, ModelContext, ModelHandle, MutableAppContext, Task,
 };
 use language::{Chunk, Point};
 use lazy_static::lazy_static;
@@ -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,
@@ -1089,7 +1093,8 @@ mod tests {
        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, tabs_snapshot) = TabMap::new(suggestion_snapshot.clone(), tab_size);
+        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);
@@ -1315,7 +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)
        }

@@ -1339,7 +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::*;
@@ -52,7 +53,7 @@ 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 +95,7 @@ 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);

@@ -388,6 +390,8 @@ 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);
@@ -506,6 +510,7 @@ pub struct Editor {
    hover_state: HoverState,
    gutter_hovered: bool,
    link_go_to_definition_state: LinkGoToDefinitionState,
+    copilot_state: CopilotState,
    _subscriptions: Vec<Subscription>,
 }

@@ -1003,6 +1008,79 @@ 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 !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>,
@@ -1176,12 +1254,14 @@ 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);
@@ -1385,6 +1465,7 @@ 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);
@@ -1758,6 +1839,10 @@ impl Editor {
            return;
        }

+        if self.hide_copilot_suggestion(cx).is_some() {
+            return;
+        }
+
        if self.snippet_stack.pop().is_some() {
            return;
        }
@@ -1933,8 +2018,18 @@ 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);
+            }
        });
    }

@@ -2015,6 +2110,7 @@ impl Editor {
                .collect();

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

@@ -2061,6 +2157,21 @@ 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);
@@ -2079,9 +2190,7 @@ 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
@@ -2279,11 +2388,11 @@ 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>(())
@@ -2385,6 +2494,8 @@ impl Editor {
                    );
                });
            }
+
+            this.refresh_copilot_suggestions(cx);
        });

        let project = self.project.clone()?;
@@ -2677,6 +2788,139 @@ 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,
@@ -2792,13 +3036,18 @@ 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(
@@ -2957,6 +3206,7 @@ impl Editor {

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

@@ -2972,6 +3222,7 @@ impl Editor {
                })
            });
            this.insert("", cx);
+            this.refresh_copilot_suggestions(cx);
        });
    }

@@ -3013,8 +3264,8 @@ 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
@@ -3033,6 +3284,16 @@ 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());
@@ -3056,7 +3317,8 @@ 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);
        });
    }

@@ -3736,6 +3998,7 @@ impl Editor {
            }
            self.request_autoscroll(Autoscroll::fit(), cx);
            self.unmark_text(cx);
+            self.refresh_copilot_suggestions(cx);
            cx.emit(Event::Edited);
        }
    }
@@ -3750,6 +4013,7 @@ impl Editor {
            }
            self.request_autoscroll(Autoscroll::fit(), cx);
            self.unmark_text(cx);
+            self.refresh_copilot_suggestions(cx);
            cx.emit(Event::Edited);
        }
    }
@@ -5421,7 +5685,7 @@ 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()
@@ -6157,6 +6421,9 @@ 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 {
@@ -6187,6 +6454,10 @@ 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;
    }
--- 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,
@@ -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::MutableAppContext) {
    cx.set_global(Settings::test(cx));
    let buffer = MultiBuffer::build_simple(
        &"
@@ -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]
@@ -5956,6 +5881,288 @@ 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");
+    });
+}
+
 fn empty_range(row: usize, column: usize) -> Range<DisplayPoint> {
    let point = DisplayPoint::new(row as u32, column as u32);
    point..point
@@ -5971,3 +6178,106 @@ 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
@@ -1318,45 +1318,47 @@ 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,
--- a/crates/editor/src/items.rs
+++ b/crates/editor/src/items.rs
@@ -747,11 +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)
    }
@@ -831,7 +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
--- a/crates/editor/src/multi_buffer.rs
+++ b/crates/editor/src/multi_buffer.rs
@@ -2933,6 +2933,10 @@ 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);
--- a/crates/feedback/Cargo.toml
+++ b/crates/feedback/Cargo.toml
@@ -24,8 +24,8 @@ lazy_static = "1.4.0"
 postage = { workspace = true }
 project = { path = "../project" }
 search = { path = "../search" }
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 settings = { path = "../settings" }
 sysinfo = "0.27.1"
 theme = { path = "../theme" }
--- a/crates/feedback/src/feedback_editor.rs
+++ b/crates/feedback/src/feedback_editor.rs
@@ -333,16 +333,16 @@ 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/file_finder/Cargo.toml
+++ b/crates/file_finder/Cargo.toml
@@ -23,7 +23,7 @@ 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
@@ -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
@@ -24,7 +24,7 @@ smol = "1.2.5"
 regex = "1.5"
 git2 = { version = "0.15", default-features = false }
 serde = { workspace = true }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde_derive = { workspace = true }
 serde_json = { workspace = true }
 log = { version = "0.4.16", features = ["kv_unstable_serde"] }
 libc = "0.2"
--- a/crates/gpui/Cargo.toml
+++ b/crates/gpui/Cargo.toml
@@ -41,9 +41,9 @@ rand = "0.8.3"
 resvg = "0.14"
 schemars = "0.8"
 seahash = "4.1"
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
-serde_json = "1.0"
+serde = { workspace = true }
+serde_derive = { workspace = true }
+serde_json = { workspace = true }
 smallvec = { version = "1.6", features = ["union"] }
 smol = "1.2"
 time = { version = "0.3", features = ["serde", "serde-well-known"] }
--- a/crates/gpui/src/app.rs
+++ b/crates/gpui/src/app.rs
@@ -254,6 +254,19 @@ impl App {
        self
    }

+    /// Handle the application being re-activated when no windows are open.
+    pub fn on_reopen<F>(&mut self, mut callback: F) -> &mut Self
+    where
+        F: 'static + FnMut(&mut MutableAppContext),
+    {
+        let cx = self.0.clone();
+        self.0
+            .borrow_mut()
+            .foreground_platform
+            .on_reopen(Box::new(move || callback(&mut *cx.borrow_mut())));
+        self
+    }
+
    pub fn on_event<F>(&mut self, mut callback: F) -> &mut Self
    where
        F: 'static + FnMut(Event, &mut MutableAppContext) -> bool,
@@ -276,9 +289,7 @@ impl App {
        self.0
            .borrow_mut()
            .foreground_platform
-            .on_open_urls(Box::new(move |paths| {
-                callback(paths, &mut *cx.borrow_mut())
-            }));
+            .on_open_urls(Box::new(move |urls| callback(urls, &mut *cx.borrow_mut())));
        self
    }

@@ -765,6 +776,12 @@ impl MutableAppContext {
            })
    }

+    pub fn has_window(&self, window_id: usize) -> bool {
+        self.window_ids()
+            .find(|window| window == &window_id)
+            .is_some()
+    }
+
    pub fn window_ids(&self) -> impl Iterator<Item = usize> + '_ {
        self.cx.windows.keys().copied()
    }
@@ -1616,14 +1633,14 @@ impl MutableAppContext {
            this.cx.windows.insert(
                window_id,
                Window {
-                    root_view: root_view.clone().into(),
+                    root_view: root_view.clone().into_any(),
                    focused_view_id: Some(root_view.id()),
                    is_active: false,
                    invalidation: None,
                    is_fullscreen: false,
                },
            );
-            root_view.update(this, |view, cx| view.focus_in(cx.handle().into(), cx));
+            root_view.update(this, |view, cx| view.focus_in(cx.handle().into_any(), cx));

            let window =
                this.cx
@@ -1645,17 +1662,18 @@ impl MutableAppContext {
            let root_view = this
                .build_and_insert_view(window_id, ParentId::Root, |cx| Some(build_root_view(cx)))
                .unwrap();
+            let focused_view_id = root_view.id();
            this.cx.windows.insert(
                window_id,
                Window {
-                    root_view: root_view.clone().into(),
-                    focused_view_id: Some(root_view.id()),
+                    root_view: root_view.clone().into_any(),
+                    focused_view_id: Some(focused_view_id),
                    is_active: false,
                    invalidation: None,
                    is_fullscreen: false,
                },
            );
-            root_view.update(this, |view, cx| view.focus_in(cx.handle().into(), cx));
+            root_view.update(this, |view, cx| view.focus_in(cx.handle().into_any(), cx));

            let status_item = this.cx.platform.add_status_item();
            this.register_platform_window(window_id, status_item);
@@ -1766,7 +1784,7 @@ impl MutableAppContext {
                .build_and_insert_view(window_id, ParentId::Root, |cx| Some(build_root_view(cx)))
                .unwrap();
            let window = this.cx.windows.get_mut(&window_id).unwrap();
-            window.root_view = root_view.clone().into();
+            window.root_view = root_view.clone().into_any();
            window.focused_view_id = Some(root_view.id());
            root_view
        })
@@ -1795,16 +1813,11 @@ impl MutableAppContext {
        )
    }

-    pub fn add_view<T, F>(
-        &mut self,
-        parent_handle: impl Into<AnyViewHandle>,
-        build_view: F,
-    ) -> ViewHandle<T>
+    pub fn add_view<T, F>(&mut self, parent_handle: &AnyViewHandle, build_view: F) -> ViewHandle<T>
    where
        T: View,
        F: FnOnce(&mut ViewContext<T>) -> T,
    {
-        let parent_handle = parent_handle.into();
        self.build_and_insert_view(
            parent_handle.window_id,
            ParentId::View(parent_handle.view_id),
@@ -2811,8 +2824,7 @@ impl AppContext {
        }
    }

-    pub fn is_child_focused(&self, view: impl Into<AnyViewHandle>) -> bool {
-        let view = view.into();
+    pub fn is_child_focused(&self, view: &AnyViewHandle) -> bool {
        if let Some(focused_view_id) = self.focused_view_id(view.window_id) {
            self.ancestors(view.window_id, focused_view_id)
                .skip(1) // Skip self id
@@ -3351,7 +3363,7 @@ where
    ) {
        let mut cx = ViewContext::new(cx, window_id, view_id);
        let focused_view_handle: AnyViewHandle = if view_id == focused_id {
-            cx.handle().into()
+            cx.handle().into_any()
        } else {
            let focused_type = cx
                .views
@@ -3373,7 +3385,7 @@ where
    ) {
        let mut cx = ViewContext::new(cx, window_id, view_id);
        let blurred_view_handle: AnyViewHandle = if view_id == blurred_id {
-            cx.handle().into()
+            cx.handle().into_any()
        } else {
            let blurred_type = cx
                .views
@@ -3777,11 +3789,7 @@ impl<'a, T: View> ViewContext<'a, T> {
        self.app.debug_elements(self.window_id).unwrap()
    }

-    pub fn focus<S>(&mut self, handle: S)
-    where
-        S: Into<AnyViewHandle>,
-    {
-        let handle = handle.into();
+    pub fn focus(&mut self, handle: &AnyViewHandle) {
        self.app.focus(handle.window_id, Some(handle.view_id));
    }

@@ -3873,8 +3881,7 @@ impl<'a, T: View> ViewContext<'a, T> {
        self.cx.parent(self.window_id, self.view_id)
    }

-    pub fn reparent(&mut self, view_handle: impl Into<AnyViewHandle>) {
-        let view_handle = view_handle.into();
+    pub fn reparent(&mut self, view_handle: &AnyViewHandle) {
        if self.window_id != view_handle.window_id {
            panic!("Can't reparent view to a view from a different window");
        }
@@ -3899,7 +3906,7 @@ impl<'a, T: View> ViewContext<'a, T> {
                .build_and_insert_view(window_id, ParentId::Root, |cx| Some(build_root_view(cx)))
                .unwrap();
            let window = this.cx.windows.get_mut(&window_id).unwrap();
-            window.root_view = root_view.clone().into();
+            window.root_view = root_view.clone().into_any();
            window.focused_view_id = Some(root_view.id());
            root_view
        })
@@ -3945,6 +3952,19 @@ impl<'a, T: View> ViewContext<'a, T> {
        })
    }

+    pub fn observe_global<G, F>(&mut self, mut callback: F) -> Subscription
+    where
+        G: Any,
+        F: 'static + FnMut(&mut T, &mut ViewContext<T>),
+    {
+        let observer = self.weak_handle();
+        self.app.observe_global::<G, _>(move |cx| {
+            if let Some(observer) = observer.upgrade(cx) {
+                observer.update(cx, |observer, cx| callback(observer, cx));
+            }
+        })
+    }
+
    pub fn observe_focus<F, V>(&mut self, handle: &ViewHandle<V>, mut callback: F) -> Subscription
    where
        F: 'static + FnMut(&mut T, ViewHandle<V>, bool, &mut ViewContext<T>),
@@ -4448,32 +4468,23 @@ pub enum EntityLocation {
 }

 pub struct ModelHandle<T: Entity> {
-    model_id: usize,
+    any_handle: AnyModelHandle,
    model_type: PhantomData<T>,
-    ref_counts: Arc<Mutex<RefCounts>>,
+}

-    #[cfg(any(test, feature = "test-support"))]
-    handle_id: usize,
+impl<T: Entity> Deref for ModelHandle<T> {
+    type Target = AnyModelHandle;
+
+    fn deref(&self) -> &Self::Target {
+        &self.any_handle
+    }
 }

 impl<T: Entity> ModelHandle<T> {
    fn new(model_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
-        ref_counts.lock().inc_model(model_id);
-
-        #[cfg(any(test, feature = "test-support"))]
-        let handle_id = ref_counts
-            .lock()
-            .leak_detector
-            .lock()
-            .handle_created(Some(type_name::<T>()), model_id);
-
        Self {
-            model_id,
+            any_handle: AnyModelHandle::new(model_id, TypeId::of::<T>(), ref_counts.clone()),
            model_type: PhantomData,
-            ref_counts: ref_counts.clone(),
-
-            #[cfg(any(test, feature = "test-support"))]
-            handle_id,
        }
    }

@@ -4557,19 +4568,6 @@ impl<T: Entity> Debug for ModelHandle<T> {
 unsafe impl<T: Entity> Send for ModelHandle<T> {}
 unsafe impl<T: Entity> Sync for ModelHandle<T> {}

-impl<T: Entity> Drop for ModelHandle<T> {
-    fn drop(&mut self) {
-        let mut ref_counts = self.ref_counts.lock();
-        ref_counts.dec_model(self.model_id);
-
-        #[cfg(any(test, feature = "test-support"))]
-        ref_counts
-            .leak_detector
-            .lock()
-            .handle_dropped(self.model_id, self.handle_id);
-    }
-}
-
 impl<T: Entity> Handle<T> for ModelHandle<T> {
    type Weak = WeakModelHandle<T>;

@@ -4594,10 +4592,24 @@ impl<T: Entity> Handle<T> for ModelHandle<T> {
 }

 pub struct WeakModelHandle<T> {
-    model_id: usize,
+    any_handle: AnyWeakModelHandle,
    model_type: PhantomData<T>,
 }

+impl<T> WeakModelHandle<T> {
+    pub fn into_any(self) -> AnyWeakModelHandle {
+        self.any_handle
+    }
+}
+
+impl<T> Deref for WeakModelHandle<T> {
+    type Target = AnyWeakModelHandle;
+
+    fn deref(&self) -> &Self::Target {
+        &self.any_handle
+    }
+}
+
 impl<T> WeakHandle for WeakModelHandle<T> {
    fn id(&self) -> usize {
        self.model_id
@@ -4610,7 +4622,10 @@ unsafe impl<T> Sync for WeakModelHandle<T> {}
 impl<T: Entity> WeakModelHandle<T> {
    fn new(model_id: usize) -> Self {
        Self {
-            model_id,
+            any_handle: AnyWeakModelHandle {
+                model_id,
+                model_type: TypeId::of::<T>(),
+            },
            model_type: PhantomData,
        }
    }
@@ -4651,7 +4666,7 @@ impl<T: Entity> PartialEq<ModelHandle<T>> for WeakModelHandle<T> {
 impl<T> Clone for WeakModelHandle<T> {
    fn clone(&self) -> Self {
        Self {
-            model_id: self.model_id,
+            any_handle: self.any_handle.clone(),
            model_type: PhantomData,
        }
    }
@@ -4659,33 +4674,30 @@ impl<T> Clone for WeakModelHandle<T> {

 impl<T> Copy for WeakModelHandle<T> {}

+#[repr(transparent)]
 pub struct ViewHandle<T> {
-    window_id: usize,
-    view_id: usize,
+    any_handle: AnyViewHandle,
    view_type: PhantomData<T>,
-    ref_counts: Arc<Mutex<RefCounts>>,
-    #[cfg(any(test, feature = "test-support"))]
-    handle_id: usize,
+}
+
+impl<T> Deref for ViewHandle<T> {
+    type Target = AnyViewHandle;
+
+    fn deref(&self) -> &Self::Target {
+        &self.any_handle
+    }
 }

 impl<T: View> ViewHandle<T> {
    fn new(window_id: usize, view_id: usize, ref_counts: &Arc<Mutex<RefCounts>>) -> Self {
-        ref_counts.lock().inc_view(window_id, view_id);
-        #[cfg(any(test, feature = "test-support"))]
-        let handle_id = ref_counts
-            .lock()
-            .leak_detector
-            .lock()
-            .handle_created(Some(type_name::<T>()), view_id);
-
        Self {
-            window_id,
-            view_id,
+            any_handle: AnyViewHandle::new(
+                window_id,
+                view_id,
+                TypeId::of::<T>(),
+                ref_counts.clone(),
+            ),
            view_type: PhantomData,
-            ref_counts: ref_counts.clone(),
-
-            #[cfg(any(test, feature = "test-support"))]
-            handle_id,
        }
    }

@@ -4693,6 +4705,10 @@ impl<T: View> ViewHandle<T> {
        WeakViewHandle::new(self.window_id, self.view_id)
    }

+    pub fn into_any(self) -> AnyViewHandle {
+        self.any_handle
+    }
+
    pub fn window_id(&self) -> usize {
        self.window_id
    }
@@ -4788,20 +4804,6 @@ impl<T> Debug for ViewHandle<T> {
    }
 }

-impl<T> Drop for ViewHandle<T> {
-    fn drop(&mut self) {
-        self.ref_counts
-            .lock()
-            .dec_view(self.window_id, self.view_id);
-        #[cfg(any(test, feature = "test-support"))]
-        self.ref_counts
-            .lock()
-            .leak_detector
-            .lock()
-            .handle_dropped(self.view_id, self.handle_id);
-    }
-}
-
 impl<T: View> Handle<T> for ViewHandle<T> {
    type Weak = WeakViewHandle<T>;

@@ -4880,19 +4882,18 @@ impl AnyViewHandle {

    pub fn downcast<T: View>(self) -> Option<ViewHandle<T>> {
        if self.is::<T>() {
-            let result = Some(ViewHandle {
-                window_id: self.window_id,
-                view_id: self.view_id,
-                ref_counts: self.ref_counts.clone(),
+            Some(ViewHandle {
+                any_handle: self,
                view_type: PhantomData,
-                #[cfg(any(test, feature = "test-support"))]
-                handle_id: self.handle_id,
-            });
-            unsafe {
-                Arc::decrement_strong_count(Arc::as_ptr(&self.ref_counts));
-            }
-            std::mem::forget(self);
-            result
+            })
+        } else {
+            None
+        }
+    }
+
+    pub fn downcast_ref<T: View>(&self) -> Option<&ViewHandle<T>> {
+        if self.is::<T>() {
+            Some(unsafe { mem::transmute(self) })
        } else {
            None
        }
@@ -4928,42 +4929,6 @@ impl Clone for AnyViewHandle {
    }
 }

-impl From<&AnyViewHandle> for AnyViewHandle {
-    fn from(handle: &AnyViewHandle) -> Self {
-        handle.clone()
-    }
-}
-
-impl<T: View> From<&ViewHandle<T>> for AnyViewHandle {
-    fn from(handle: &ViewHandle<T>) -> Self {
-        Self::new(
-            handle.window_id,
-            handle.view_id,
-            TypeId::of::<T>(),
-            handle.ref_counts.clone(),
-        )
-    }
-}
-
-impl<T: View> From<ViewHandle<T>> for AnyViewHandle {
-    fn from(handle: ViewHandle<T>) -> Self {
-        let any_handle = AnyViewHandle {
-            window_id: handle.window_id,
-            view_id: handle.view_id,
-            view_type: TypeId::of::<T>(),
-            ref_counts: handle.ref_counts.clone(),
-            #[cfg(any(test, feature = "test-support"))]
-            handle_id: handle.handle_id,
-        };
-
-        unsafe {
-            Arc::decrement_strong_count(Arc::as_ptr(&handle.ref_counts));
-        }
-        std::mem::forget(handle);
-        any_handle
-    }
-}
-
 impl<T> PartialEq<ViewHandle<T>> for AnyViewHandle {
    fn eq(&self, other: &ViewHandle<T>) -> bool {
        self.window_id == other.window_id && self.view_id == other.view_id
@@ -5016,19 +4981,10 @@ impl AnyModelHandle {

    pub fn downcast<T: Entity>(self) -> Option<ModelHandle<T>> {
        if self.is::<T>() {
-            let result = Some(ModelHandle {
-                model_id: self.model_id,
+            Some(ModelHandle {
+                any_handle: self,
                model_type: PhantomData,
-                ref_counts: self.ref_counts.clone(),
-
-                #[cfg(any(test, feature = "test-support"))]
-                handle_id: self.handle_id,
-            });
-            unsafe {
-                Arc::decrement_strong_count(Arc::as_ptr(&self.ref_counts));
-            }
-            std::mem::forget(self);
-            result
+            })
        } else {
            None
        }
@@ -5050,16 +5006,6 @@ impl AnyModelHandle {
    }
 }

-impl<T: Entity> From<ModelHandle<T>> for AnyModelHandle {
-    fn from(handle: ModelHandle<T>) -> Self {
-        Self::new(
-            handle.model_id,
-            TypeId::of::<T>(),
-            handle.ref_counts.clone(),
-        )
-    }
-}
-
 impl Clone for AnyModelHandle {
    fn clone(&self) -> Self {
        Self::new(self.model_id, self.model_type, self.ref_counts.clone())
@@ -5079,7 +5025,7 @@ impl Drop for AnyModelHandle {
    }
 }

-#[derive(Hash, PartialEq, Eq, Debug)]
+#[derive(Hash, PartialEq, Eq, Debug, Clone, Copy)]
 pub struct AnyWeakModelHandle {
    model_id: usize,
    model_type: TypeId,
@@ -5097,10 +5043,10 @@ impl AnyWeakModelHandle {
        TypeId::of::<T>() == self.model_type
    }

-    pub fn downcast<T: Entity>(&self) -> Option<WeakModelHandle<T>> {
+    pub fn downcast<T: Entity>(self) -> Option<WeakModelHandle<T>> {
        if self.is::<T>() {
            let result = Some(WeakModelHandle {
-                model_id: self.model_id,
+                any_handle: self,
                model_type: PhantomData,
            });

@@ -5111,19 +5057,9 @@ impl AnyWeakModelHandle {
    }
 }

-impl<T: Entity> From<WeakModelHandle<T>> for AnyWeakModelHandle {
-    fn from(handle: WeakModelHandle<T>) -> Self {
-        AnyWeakModelHandle {
-            model_id: handle.model_id,
-            model_type: TypeId::of::<T>(),
-        }
-    }
-}
-
 #[derive(Debug, Copy)]
 pub struct WeakViewHandle<T> {
-    window_id: usize,
-    view_id: usize,
+    any_handle: AnyWeakViewHandle,
    view_type: PhantomData<T>,
 }

@@ -5136,8 +5072,11 @@ impl<T> WeakHandle for WeakViewHandle<T> {
 impl<T: View> WeakViewHandle<T> {
    fn new(window_id: usize, view_id: usize) -> Self {
        Self {
-            window_id,
-            view_id,
+            any_handle: AnyWeakViewHandle {
+                window_id,
+                view_id,
+                view_type: TypeId::of::<T>(),
+            },
            view_type: PhantomData,
        }
    }
@@ -5150,16 +5089,27 @@ impl<T: View> WeakViewHandle<T> {
        self.window_id
    }

+    pub fn into_any(self) -> AnyWeakViewHandle {
+        self.any_handle
+    }
+
    pub fn upgrade(&self, cx: &impl UpgradeViewHandle) -> Option<ViewHandle<T>> {
        cx.upgrade_view_handle(self)
    }
 }

+impl<T> Deref for WeakViewHandle<T> {
+    type Target = AnyWeakViewHandle;
+
+    fn deref(&self) -> &Self::Target {
+        &self.any_handle
+    }
+}
+
 impl<T> Clone for WeakViewHandle<T> {
    fn clone(&self) -> Self {
        Self {
-            window_id: self.window_id,
-            view_id: self.view_id,
+            any_handle: self.any_handle.clone(),
            view_type: PhantomData,
        }
    }
@@ -5175,11 +5125,11 @@ impl<T> Eq for WeakViewHandle<T> {}

 impl<T> Hash for WeakViewHandle<T> {
    fn hash<H: Hasher>(&self, state: &mut H) {
-        self.window_id.hash(state);
-        self.view_id.hash(state);
+        self.any_handle.hash(state);
    }
 }

+#[derive(Debug, Clone, Copy)]
 pub struct AnyWeakViewHandle {
    window_id: usize,
    view_id: usize,
@@ -5196,13 +5146,11 @@ impl AnyWeakViewHandle {
    }
 }

-impl<T: View> From<WeakViewHandle<T>> for AnyWeakViewHandle {
-    fn from(handle: WeakViewHandle<T>) -> Self {
-        AnyWeakViewHandle {
-            window_id: handle.window_id,
-            view_id: handle.view_id,
-            view_type: TypeId::of::<T>(),
-        }
+impl Hash for AnyWeakViewHandle {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.window_id.hash(state);
+        self.view_id.hash(state);
+        self.view_type.hash(state);
    }
 }

@@ -6125,7 +6073,7 @@ mod tests {
        }

        let (_, root_view) = cx.add_window(Default::default(), |_| TestView::default());
-        let observing_view = cx.add_view(root_view, |_| TestView::default());
+        let observing_view = cx.add_view(&root_view, |_| TestView::default());
        let observing_model = cx.add_model(|_| Model);
        let observed_model = cx.add_model(|_| Model);

@@ -6374,8 +6322,8 @@ mod tests {
            cx.focus(&view_1);
            cx.focus(&view_2);
        });
-        assert!(cx.is_child_focused(view_1.clone()));
-        assert!(!cx.is_child_focused(view_2.clone()));
+        assert!(cx.is_child_focused(&view_1));
+        assert!(!cx.is_child_focused(&view_2));
        assert_eq!(
            mem::take(&mut *view_events.lock()),
            [
@@ -6400,8 +6348,8 @@ mod tests {
        );

        view_1.update(cx, |_, cx| cx.focus(&view_1));
-        assert!(!cx.is_child_focused(view_1.clone()));
-        assert!(!cx.is_child_focused(view_2.clone()));
+        assert!(!cx.is_child_focused(&view_1));
+        assert!(!cx.is_child_focused(&view_2));
        assert_eq!(
            mem::take(&mut *view_events.lock()),
            ["view 2 blurred", "view 1 focused"],
--- a/crates/gpui/src/app/test_app_context.rs
+++ b/crates/gpui/src/app/test_app_context.rs
@@ -137,11 +137,7 @@ impl TestAppContext {
        (window_id, view)
    }

-    pub fn add_view<T, F>(
-        &mut self,
-        parent_handle: impl Into<AnyViewHandle>,
-        build_view: F,
-    ) -> ViewHandle<T>
+    pub fn add_view<T, F>(&mut self, parent_handle: &AnyViewHandle, build_view: F) -> ViewHandle<T>
    where
        T: View,
        F: FnOnce(&mut ViewContext<T>) -> T,
--- a/crates/gpui/src/elements.rs
+++ b/crates/gpui/src/elements.rs
@@ -227,6 +227,7 @@ pub enum Lifecycle<T: Element> {
        paint: T::PaintState,
    },
 }
+
 pub struct ElementBox(ElementRc);

 #[derive(Clone)]
@@ -389,6 +390,12 @@ impl ElementBox {
    }
 }

+impl Clone for ElementBox {
+    fn clone(&self) -> Self {
+        ElementBox(self.0.clone())
+    }
+}
+
 impl From<ElementBox> for ElementRc {
    fn from(val: ElementBox) -> Self {
        val.0
--- a/crates/gpui/src/platform.rs
+++ b/crates/gpui/src/platform.rs
@@ -90,6 +90,10 @@ pub(crate) trait ForegroundPlatform {
    fn on_become_active(&self, callback: Box<dyn FnMut()>);
    fn on_resign_active(&self, callback: Box<dyn FnMut()>);
    fn on_quit(&self, callback: Box<dyn FnMut()>);
+
+    /// Handle the application being re-activated with no windows open.
+    fn on_reopen(&self, callback: Box<dyn FnMut()>);
+
    fn on_event(&self, callback: Box<dyn FnMut(Event) -> bool>);
    fn on_open_urls(&self, callback: Box<dyn FnMut(Vec<String>)>);
    fn run(&self, on_finish_launching: Box<dyn FnOnce()>);
--- a/crates/gpui/src/platform/mac/geometry.rs
+++ b/crates/gpui/src/platform/mac/geometry.rs
@@ -1,7 +1,6 @@
 use cocoa::{
-    appkit::NSWindow,
    base::id,
-    foundation::{NSPoint, NSRect, NSSize},
+    foundation::{NSPoint, NSRect},
 };
 use objc::{msg_send, sel, sel_impl};
 use pathfinder_geometry::{
@@ -25,61 +24,15 @@ impl Vector2FExt for Vector2F {
    }
 }

-pub trait RectFExt {
-    /// Converts self to an NSRect with y axis pointing up.
-    /// The resulting NSRect will have an origin at the bottom left of the rectangle.
-    /// Also takes care of converting from window scaled coordinates to screen coordinates
-    fn to_screen_ns_rect(&self, native_window: id) -> NSRect;
-
-    /// Converts self to an NSRect with y axis point up.
-    /// The resulting NSRect will have an origin at the bottom left of the rectangle.
-    /// Unlike to_screen_ns_rect, coordinates are not converted and are assumed to already be in screen scale
-    fn to_ns_rect(&self) -> NSRect;
-}
-impl RectFExt for RectF {
-    fn to_screen_ns_rect(&self, native_window: id) -> NSRect {
-        unsafe { native_window.convertRectToScreen_(self.to_ns_rect()) }
-    }
-
-    fn to_ns_rect(&self) -> NSRect {
-        NSRect::new(
-            NSPoint::new(
-                self.origin_x() as f64,
-                -(self.origin_y() + self.height()) as f64,
-            ),
-            NSSize::new(self.width() as f64, self.height() as f64),
-        )
-    }
-}
-
 pub trait NSRectExt {
-    /// Converts self to a RectF with y axis pointing down.
-    /// The resulting RectF will have an origin at the top left of the rectangle.
-    /// Also takes care of converting from screen scale coordinates to window coordinates
-    fn to_window_rectf(&self, native_window: id) -> RectF;
-
-    /// Converts self to a RectF with y axis pointing down.
-    /// The resulting RectF will have an origin at the top left of the rectangle.
-    /// Unlike to_screen_ns_rect, coordinates are not converted and are assumed to already be in screen scale
    fn to_rectf(&self) -> RectF;
-
    fn intersects(&self, other: Self) -> bool;
 }
-impl NSRectExt for NSRect {
-    fn to_window_rectf(&self, native_window: id) -> RectF {
-        unsafe {
-            self.origin.x;
-            let rect: NSRect = native_window.convertRectFromScreen_(*self);
-            rect.to_rectf()
-        }
-    }

+impl NSRectExt for NSRect {
    fn to_rectf(&self) -> RectF {
        RectF::new(
-            vec2f(
-                self.origin.x as f32,
-                -(self.origin.y + self.size.height) as f32,
-            ),
+            vec2f(self.origin.x as f32, self.origin.y as f32),
            vec2f(self.size.width as f32, self.size.height as f32),
        )
    }
--- a/crates/gpui/src/platform/mac/platform.rs
+++ b/crates/gpui/src/platform/mac/platform.rs
@@ -82,6 +82,10 @@ unsafe fn build_classes() {
            sel!(applicationDidFinishLaunching:),
            did_finish_launching as extern "C" fn(&mut Object, Sel, id),
        );
+        decl.add_method(
+            sel!(applicationShouldHandleReopen:hasVisibleWindows:),
+            should_handle_reopen as extern "C" fn(&mut Object, Sel, id, bool),
+        );
        decl.add_method(
            sel!(applicationDidBecomeActive:),
            did_become_active as extern "C" fn(&mut Object, Sel, id),
@@ -144,6 +148,7 @@ pub struct MacForegroundPlatform(RefCell<MacForegroundPlatformState>);
 pub struct MacForegroundPlatformState {
    become_active: Option<Box<dyn FnMut()>>,
    resign_active: Option<Box<dyn FnMut()>>,
+    reopen: Option<Box<dyn FnMut()>>,
    quit: Option<Box<dyn FnMut()>>,
    event: Option<Box<dyn FnMut(crate::Event) -> bool>>,
    menu_command: Option<Box<dyn FnMut(&dyn Action)>>,
@@ -158,15 +163,16 @@ pub struct MacForegroundPlatformState {
 impl MacForegroundPlatform {
    pub fn new(foreground: Rc<executor::Foreground>) -> Self {
        Self(RefCell::new(MacForegroundPlatformState {
-            become_active: Default::default(),
-            resign_active: Default::default(),
-            quit: Default::default(),
-            event: Default::default(),
-            menu_command: Default::default(),
-            validate_menu_command: Default::default(),
-            will_open_menu: Default::default(),
-            open_urls: Default::default(),
-            finish_launching: Default::default(),
+            become_active: None,
+            resign_active: None,
+            reopen: None,
+            quit: None,
+            event: None,
+            menu_command: None,
+            validate_menu_command: None,
+            will_open_menu: None,
+            open_urls: None,
+            finish_launching: None,
            menu_actions: Default::default(),
            foreground,
        }))
@@ -332,6 +338,10 @@ impl platform::ForegroundPlatform for MacForegroundPlatform {
        self.0.borrow_mut().quit = Some(callback);
    }

+    fn on_reopen(&self, callback: Box<dyn FnMut()>) {
+        self.0.borrow_mut().reopen = Some(callback);
+    }
+
    fn on_event(&self, callback: Box<dyn FnMut(crate::Event) -> bool>) {
        self.0.borrow_mut().event = Some(callback);
    }
@@ -943,6 +953,15 @@ extern "C" fn did_finish_launching(this: &mut Object, _: Sel, _: id) {
    }
 }

+extern "C" fn should_handle_reopen(this: &mut Object, _: Sel, _: id, has_open_windows: bool) {
+    if !has_open_windows {
+        let platform = unsafe { get_foreground_platform(this) };
+        if let Some(callback) = platform.0.borrow_mut().reopen.as_mut() {
+            callback();
+        }
+    }
+}
+
 extern "C" fn did_become_active(this: &mut Object, _: Sel, _: id) {
    let platform = unsafe { get_foreground_platform(this) };
    if let Some(callback) = platform.0.borrow_mut().become_active.as_mut() {
--- a/crates/gpui/src/platform/mac/window.rs
+++ b/crates/gpui/src/platform/mac/window.rs
@@ -8,7 +8,7 @@ use crate::{
    mac::platform::NSViewLayerContentsRedrawDuringViewResize,
    platform::{
        self,
-        mac::{geometry::RectFExt, renderer::Renderer, screen::Screen},
+        mac::{renderer::Renderer, screen::Screen},
        Event, WindowBounds,
    },
    InputHandler, KeyDownEvent, ModifiersChangedEvent, MouseButton, MouseButtonEvent,
@@ -372,7 +372,8 @@ impl WindowState {
            }

            let window_frame = self.frame();
-            if window_frame == self.native_window.screen().visibleFrame().to_rectf() {
+            let screen_frame = self.native_window.screen().visibleFrame().to_rectf();
+            if window_frame.size() == screen_frame.size() {
                WindowBounds::Maximized
            } else {
                WindowBounds::Fixed(window_frame)
@@ -383,8 +384,19 @@ impl WindowState {
    // Returns the window bounds in window coordinates
    fn frame(&self) -> RectF {
        unsafe {
-            let ns_frame = NSWindow::frame(self.native_window);
-            ns_frame.to_rectf()
+            let screen_frame = self.native_window.screen().visibleFrame();
+            let window_frame = NSWindow::frame(self.native_window);
+            RectF::new(
+                vec2f(
+                    window_frame.origin.x as f32,
+                    (screen_frame.size.height - window_frame.origin.y - window_frame.size.height)
+                        as f32,
+                ),
+                vec2f(
+                    window_frame.size.width as f32,
+                    window_frame.size.height as f32,
+                ),
+            )
        }
    }

@@ -472,7 +484,16 @@ impl Window {
                }
                WindowBounds::Fixed(rect) => {
                    let screen_frame = screen.visibleFrame();
-                    let ns_rect = rect.to_ns_rect();
+                    let ns_rect = NSRect::new(
+                        NSPoint::new(
+                            rect.origin_x() as f64,
+                            screen_frame.size.height
+                                - rect.origin_y() as f64
+                                - rect.height() as f64,
+                        ),
+                        NSSize::new(rect.width() as f64, rect.height() as f64),
+                    );
+
                    if ns_rect.intersects(screen_frame) {
                        native_window.setFrame_display_(ns_rect, YES);
                    } else {
--- a/crates/gpui/src/platform/test.rs
+++ b/crates/gpui/src/platform/test.rs
@@ -61,13 +61,10 @@ impl ForegroundPlatform {

 impl super::ForegroundPlatform for ForegroundPlatform {
    fn on_become_active(&self, _: Box<dyn FnMut()>) {}
-
    fn on_resign_active(&self, _: Box<dyn FnMut()>) {}
-
    fn on_quit(&self, _: Box<dyn FnMut()>) {}
-
+    fn on_reopen(&self, _: Box<dyn FnMut()>) {}
    fn on_event(&self, _: Box<dyn FnMut(crate::Event) -> bool>) {}
-
    fn on_open_urls(&self, _: Box<dyn FnMut(Vec<String>)>) {}

    fn run(&self, _on_finish_launching: Box<dyn FnOnce()>) {
--- a/crates/gpui/src/presenter.rs
+++ b/crates/gpui/src/presenter.rs
@@ -638,7 +638,7 @@ impl<'a> LayoutContext<'a> {
            (Some(layout_parent), Some(ParentId::View(app_parent))) => {
                if layout_parent != app_parent {
                    panic!(
-                        "View {} was laid out with parent {} when it was constructed with parent {}", 
+                        "View {} was laid out with parent {} when it was constructed with parent {}",
                        print_error(view_id),
                        print_error(*layout_parent),
                        print_error(*app_parent))
@@ -1059,8 +1059,7 @@ pub struct ChildView {
 }

 impl ChildView {
-    pub fn new(view: impl Into<AnyViewHandle>, cx: &AppContext) -> Self {
-        let view = view.into();
+    pub fn new(view: &AnyViewHandle, cx: &AppContext) -> Self {
        let view_name = cx.view_ui_name(view.window_id(), view.id()).unwrap();
        Self {
            view: view.downgrade(),
--- a/crates/language/Cargo.toml
+++ b/crates/language/Cargo.toml
@@ -46,9 +46,9 @@ parking_lot = "0.11.1"
 postage = { workspace = true }
 rand = { version = "0.8.3", optional = true }
 regex = "1.5"
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
-serde_json = { version = "1", features = ["preserve_order"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
+serde_json = { workspace = true }
 similar = "1.3"
 smallvec = { version = "1.6", features = ["union"] }
 smol = "1.2"
--- a/crates/language/src/language.rs
+++ b/crates/language/src/language.rs
@@ -10,7 +10,6 @@ mod buffer_tests;

 use anyhow::{anyhow, Context, Result};
 use async_trait::async_trait;
-use client::http::HttpClient;
 use collections::HashMap;
 use futures::{
    channel::oneshot,
@@ -20,6 +19,7 @@ use futures::{
 use gpui::{executor::Background, MutableAppContext, Task};
 use highlight_map::HighlightMap;
 use lazy_static::lazy_static;
+use lsp::CodeActionKind;
 use parking_lot::{Mutex, RwLock};
 use postage::watch;
 use regex::Regex;
@@ -45,6 +45,7 @@ use syntax_map::SyntaxSnapshot;
 use theme::{SyntaxTheme, Theme};
 use tree_sitter::{self, Query};
 use unicase::UniCase;
+use util::http::HttpClient;
 use util::{merge_json_value_into, post_inc, ResultExt, TryFutureExt as _, UnwrapFuture};

 #[cfg(any(test, feature = "test-support"))]
@@ -140,6 +141,10 @@ impl CachedLspAdapter {
        self.adapter.cached_server_binary(container_dir).await
    }

+    pub fn code_action_kinds(&self) -> Option<Vec<CodeActionKind>> {
+        self.adapter.code_action_kinds()
+    }
+
    pub fn workspace_configuration(
        &self,
        cx: &mut MutableAppContext,
@@ -225,6 +230,16 @@ pub trait LspAdapter: 'static + Send + Sync {
        None
    }

+    fn code_action_kinds(&self) -> Option<Vec<CodeActionKind>> {
+        Some(vec![
+            CodeActionKind::EMPTY,
+            CodeActionKind::QUICKFIX,
+            CodeActionKind::REFACTOR,
+            CodeActionKind::REFACTOR_EXTRACT,
+            CodeActionKind::SOURCE,
+        ])
+    }
+
    async fn disk_based_diagnostic_sources(&self) -> Vec<String> {
        Default::default()
    }
@@ -825,6 +840,7 @@ impl LanguageRegistry {
                &binary.path,
                &binary.arguments,
                &root_path,
+                adapter.code_action_kinds(),
                cx,
            )?;

--- a/crates/language_selector/src/language_selector.rs
+++ b/crates/language_selector/src/language_selector.rs
@@ -121,7 +121,7 @@ impl View for LanguageSelector {
    }

    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/live_kit_client/Cargo.toml
+++ b/crates/live_kit_client/Cargo.toml
@@ -62,12 +62,12 @@ jwt = "0.16"
 lazy_static = "1.4"
 objc = "0.2"
 parking_lot = "0.11.1"
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 sha2 = "0.10"
 simplelog = "0.9"

 [build-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"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
+serde_json = { workspace = true }
--- a/crates/live_kit_server/Cargo.toml
+++ b/crates/live_kit_server/Cargo.toml
@@ -19,8 +19,8 @@ jwt = "0.16"
 prost = "0.8"
 prost-types = "0.8"
 reqwest = "0.11"
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 sha2 = "0.10"

 [build-dependencies]
--- a/crates/lsp/Cargo.toml
+++ b/crates/lsp/Cargo.toml
@@ -22,9 +22,9 @@ log = { version = "0.4.16", features = ["kv_unstable_serde"] }
 lsp-types = "0.91"
 parking_lot = "0.11"
 postage = { workspace = true }
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
-serde_json = { version = "1.0", features = ["raw_value"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
+serde_json = { workspace = true }
 smol = "1.2"

 [dev-dependencies]
--- a/crates/lsp/src/lsp.rs
+++ b/crates/lsp/src/lsp.rs
@@ -40,6 +40,7 @@ pub struct LanguageServer {
    outbound_tx: channel::Sender<Vec<u8>>,
    name: String,
    capabilities: ServerCapabilities,
+    code_action_kinds: Option<Vec<CodeActionKind>>,
    notification_handlers: Arc<Mutex<HashMap<&'static str, NotificationHandler>>>,
    response_handlers: Arc<Mutex<Option<HashMap<usize, ResponseHandler>>>>,
    executor: Arc<executor::Background>,
@@ -110,6 +111,7 @@ impl LanguageServer {
        binary_path: &Path,
        arguments: &[T],
        root_path: &Path,
+        code_action_kinds: Option<Vec<CodeActionKind>>,
        cx: AsyncAppContext,
    ) -> Result<Self> {
        let working_dir = if root_path.is_dir() {
@@ -135,6 +137,7 @@ impl LanguageServer {
            stout,
            Some(server),
            root_path,
+            code_action_kinds,
            cx,
            |notification| {
                log::info!(
@@ -160,6 +163,7 @@ impl LanguageServer {
        stdout: Stdout,
        server: Option<Child>,
        root_path: &Path,
+        code_action_kinds: Option<Vec<CodeActionKind>>,
        cx: AsyncAppContext,
        on_unhandled_notification: F,
    ) -> Self
@@ -197,6 +201,7 @@ impl LanguageServer {
            response_handlers,
            name: Default::default(),
            capabilities: Default::default(),
+            code_action_kinds,
            next_id: Default::default(),
            outbound_tx,
            executor: cx.background(),
@@ -207,6 +212,10 @@ impl LanguageServer {
        }
    }

+    pub fn code_action_kinds(&self) -> Option<Vec<CodeActionKind>> {
+        self.code_action_kinds.clone()
+    }
+
    async fn handle_input<Stdout, F>(
        stdout: Stdout,
        mut on_unhandled_notification: F,
@@ -326,6 +335,7 @@ impl LanguageServer {
                    did_change_configuration: Some(DynamicRegistrationClientCapabilities {
                        dynamic_registration: Some(true),
                    }),
+                    workspace_folders: Some(true),
                    ..Default::default()
                }),
                text_document: Some(TextDocumentClientCapabilities {
@@ -715,6 +725,7 @@ impl LanguageServer {
            stdout_reader,
            None,
            Path::new("/"),
+            None,
            cx.clone(),
            |_| {},
        );
@@ -725,6 +736,7 @@ impl LanguageServer {
                stdin_reader,
                None,
                Path::new("/"),
+                None,
                cx,
                move |msg| {
                    notifications_tx
--- a/crates/node_runtime/Cargo.toml
+++ b/crates/node_runtime/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "node_runtime"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+path = "src/node_runtime.rs"
+doctest = false
+
+[dependencies]
+gpui = { path = "../gpui" }
+util = { path = "../util" }
+async-compression = { version = "0.3", features = ["gzip", "futures-bufread"] }
+async-tar = "0.4.2"
+futures = "0.3"
+anyhow = "1.0.38"
+parking_lot = "0.11.1"
+serde = { workspace = true }
+serde_derive = { workspace = true }
+serde_json = { workspace = true }
+smol = "1.2.5"
--- a/crates/zed/src/languages/node_runtime.rs
+++ b/crates/zed/src/languages/node_runtime.rs
@@ -1,7 +1,6 @@
 use anyhow::{anyhow, bail, Context, Result};
 use async_compression::futures::bufread::GzipDecoder;
 use async_tar::Archive;
-use client::http::HttpClient;
 use futures::{future::Shared, FutureExt};
 use gpui::{executor::Background, Task};
 use parking_lot::Mutex;
@@ -12,6 +11,7 @@ use std::{
    path::{Path, PathBuf},
    sync::Arc,
 };
+use util::http::HttpClient;

 const VERSION: &str = "v18.15.0";

--- a/crates/outline/src/outline.rs
+++ b/crates/outline/src/outline.rs
@@ -49,7 +49,7 @@ impl View for OutlineView {
    }

    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/picker/Cargo.toml
+++ b/crates/picker/Cargo.toml
@@ -21,7 +21,7 @@ parking_lot = "0.11.1"

 [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/plugin/Cargo.toml
+++ b/crates/plugin/Cargo.toml
@@ -5,7 +5,7 @@ edition = "2021"
 publish = false

 [dependencies]
-serde = "1.0"
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 bincode = "1.3"
 plugin_macros = { path = "../plugin_macros" }
--- a/crates/plugin_macros/Cargo.toml
+++ b/crates/plugin_macros/Cargo.toml
@@ -11,6 +11,6 @@ proc-macro = true
 syn = { version = "1.0", features = ["full",  "extra-traits"] }
 quote = "1.0"
 proc-macro2 = "1.0"
-serde = "1.0"
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 bincode = "1.3"
--- a/crates/plugin_runtime/Cargo.toml
+++ b/crates/plugin_runtime/Cargo.toml
@@ -9,9 +9,9 @@ wasmtime = "0.38"
 wasmtime-wasi = "0.38"
 wasi-common = "0.38"
 anyhow = { version = "1.0", features = ["std"] }
-serde = "1.0"
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
-serde_json = "1.0"
+serde = { workspace = true }
+serde_derive = { workspace = true }
+serde_json = { workspace = true }
 bincode = "1.3"
 pollster = "0.2.5"
 smol = "1.2.5"
--- a/crates/project/Cargo.toml
+++ b/crates/project/Cargo.toml
@@ -49,9 +49,9 @@ postage = { workspace = true }
 pulldown-cmark = { version = "0.9.1", default-features = false }
 rand = "0.8.3"
 regex = "1.5"
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
-serde_json = { version = "1.0", features = ["preserve_order"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
+serde_json = { workspace = true }
 sha2 = "0.10"
 similar = "1.3"
 smol = "1.2.5"
--- a/crates/project/src/project.rs
+++ b/crates/project/src/project.rs
@@ -568,7 +568,7 @@ impl Project {

        let mut languages = LanguageRegistry::test();
        languages.set_executor(cx.background());
-        let http_client = client::test::FakeHttpClient::with_404_response();
+        let http_client = util::http::FakeHttpClient::with_404_response();
        let client = cx.update(|cx| client::Client::new(http_client.clone(), cx));
        let user_store = cx.add_model(|cx| UserStore::new(client.clone(), http_client, cx));
        let project =
@@ -1231,7 +1231,9 @@ impl Project {
                    File::from_dyn(buffer.file()).and_then(|file| file.project_entry_id(cx))
                })
                .ok_or_else(|| anyhow!("no project entry"))?;
-            Ok((project_entry_id, buffer.into()))
+
+            let buffer: &AnyModelHandle = &buffer;
+            Ok((project_entry_id, buffer.clone()))
        })
    }

@@ -3773,7 +3775,7 @@ impl Project {
            worktree = file.worktree.clone();
            buffer_abs_path = file.as_local().map(|f| f.abs_path(cx));
        } else {
-            return Task::ready(Ok(Default::default()));
+            return Task::ready(Ok(Vec::new()));
        };
        let range = buffer.anchor_before(range.start)..buffer.anchor_before(range.end);

@@ -3783,13 +3785,13 @@ impl Project {
            {
                server.clone()
            } else {
-                return Task::ready(Ok(Default::default()));
+                return Task::ready(Ok(Vec::new()));
            };

            let lsp_range = range_to_lsp(range.to_point_utf16(buffer));
            cx.foreground().spawn(async move {
                if lang_server.capabilities().code_action_provider.is_none() {
-                    return Ok(Default::default());
+                    return Ok(Vec::new());
                }

                Ok(lang_server
@@ -3802,13 +3804,7 @@ impl Project {
                        partial_result_params: Default::default(),
                        context: lsp::CodeActionContext {
                            diagnostics: relevant_diagnostics,
-                            only: Some(vec![
-                                lsp::CodeActionKind::EMPTY,
-                                lsp::CodeActionKind::QUICKFIX,
-                                lsp::CodeActionKind::REFACTOR,
-                                lsp::CodeActionKind::REFACTOR_EXTRACT,
-                                lsp::CodeActionKind::SOURCE,
-                            ]),
+                            only: lang_server.code_action_kinds(),
                        },
                    })
                    .await?
--- a/crates/project/src/worktree.rs
+++ b/crates/project/src/worktree.rs
@@ -3114,13 +3114,14 @@ impl<'a> TryFrom<(&'a CharBag, proto::Entry)> for Entry {
 #[cfg(test)]
 mod tests {
    use super::*;
-    use client::test::FakeHttpClient;
    use fs::repository::FakeGitRepository;
    use fs::{FakeFs, RealFs};
    use gpui::{executor::Deterministic, TestAppContext};
    use rand::prelude::*;
    use serde_json::json;
    use std::{env, fmt::Write};
+    use util::http::FakeHttpClient;
+
    use util::test::temp_tree;

    #[gpui::test]
--- a/crates/project_panel/Cargo.toml
+++ b/crates/project_panel/Cargo.toml
@@ -27,4 +27,4 @@ unicase = "2.6"
 editor = { path = "../editor", features = ["test-support"] }
 gpui = { path = "../gpui", features = ["test-support"] }
 workspace = { path = "../workspace", features = ["test-support"] }
-serde_json = { version = "1.0", features = ["preserve_order"] }
+serde_json = { workspace = true }
--- a/crates/project_panel/src/project_panel.rs
+++ b/crates/project_panel/src/project_panel.rs
@@ -1109,7 +1109,7 @@ impl ProjectPanel {
                .boxed(),
            )
            .with_child(if show_editor && editor.is_some() {
-                ChildView::new(editor.unwrap().clone(), cx)
+                ChildView::new(editor.as_ref().unwrap(), cx)
                    .contained()
                    .with_margin_left(style.icon_spacing)
                    .aligned()
--- a/crates/project_symbols/src/project_symbols.rs
+++ b/crates/project_symbols/src/project_symbols.rs
@@ -49,7 +49,7 @@ impl View for ProjectSymbolsView {
    }

    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/recent_projects/Cargo.toml
+++ b/crates/recent_projects/Cargo.toml
@@ -21,3 +21,4 @@ workspace = { path = "../workspace" }
 ordered-float = "2.1.1"
 postage = { workspace = true }
 smol = "1.2"
+util = { path = "../util"}
--- a/crates/recent_projects/src/highlighted_workspace_location.rs
+++ b/crates/recent_projects/src/highlighted_workspace_location.rs
@@ -61,6 +61,7 @@ impl HighlightedWorkspaceLocation {
            .paths()
            .iter()
            .map(|path| {
+                let path = util::paths::compact(&path);
                let highlighted_text = Self::highlights_for_path(
                    path.as_ref(),
                    &string_match.positions,
--- a/crates/recent_projects/src/recent_projects.rs
+++ b/crates/recent_projects/src/recent_projects.rs
@@ -103,7 +103,7 @@ impl View for RecentProjectsView {
    }

    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/rpc/Cargo.toml
+++ b/crates/rpc/Cargo.toml
@@ -26,8 +26,8 @@ parking_lot = "0.11.1"
 prost = "0.8"
 rand = "0.8"
 rsa = "0.4"
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 smol-timeout = "0.6"
 tracing = { version = "0.1.34", features = ["log"] }
 zstd = "0.11"
--- a/crates/search/Cargo.toml
+++ b/crates/search/Cargo.toml
@@ -23,14 +23,14 @@ anyhow = "1.0"
 futures = "0.3"
 log = { version = "0.4.16", features = ["kv_unstable_serde"] }
 postage = { workspace = true }
-serde = { version = "1.0", features = ["derive", "rc"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }
 smallvec = { version = "1.6", features = ["union"] }
 smol = "1.2"

 [dev-dependencies]
 editor = { path = "../editor", features = ["test-support"] }
 gpui = { path = "../gpui", features = ["test-support"] }
-serde_json = { version = "1.0", features = ["preserve_order"] }
+serde_json = { workspace = true }
 workspace = { path = "../workspace", features = ["test-support"] }
 unindent = "0.1"
--- a/crates/search/src/buffer_search.rs
+++ b/crates/search/src/buffer_search.rs
@@ -273,7 +273,7 @@ impl BufferSearchBar {
            }
        }
        if let Some(active_editor) = self.active_searchable_item.as_ref() {
-            cx.focus(active_editor);
+            cx.focus(active_editor.as_any());
        }
        cx.emit(Event::UpdateLocation);
        cx.notify();
@@ -458,7 +458,7 @@ impl BufferSearchBar {

    fn focus_editor(&mut self, _: &FocusEditor, cx: &mut ViewContext<Self>) {
        if let Some(active_editor) = self.active_searchable_item.as_ref() {
-            cx.focus(active_editor);
+            cx.focus(active_editor.as_any());
        }
    }

--- a/crates/search/src/project_search.rs
+++ b/crates/search/src/project_search.rs
@@ -222,16 +222,16 @@ impl View for ProjectSearchView {
 }

 impl Item for ProjectSearchView {
-    fn act_as_type(
-        &self,
+    fn act_as_type<'a>(
+        &'a self,
        type_id: TypeId,
-        self_handle: &ViewHandle<Self>,
-        _: &gpui::AppContext,
-    ) -> Option<gpui::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.results_editor).into())
+            Some(&self.results_editor)
        } else {
            None
        }
@@ -246,7 +246,7 @@ impl Item for ProjectSearchView {
        &self,
        _detail: Option<usize>,
        tab_theme: &theme::Tab,
-        cx: &gpui::AppContext,
+        cx: &AppContext,
    ) -> ElementBox {
        Flex::row()
            .with_child(
@@ -277,7 +277,7 @@ impl Item for ProjectSearchView {
        false
    }

-    fn can_save(&self, _: &gpui::AppContext) -> bool {
+    fn can_save(&self, _: &AppContext) -> bool {
        true
    }

@@ -930,7 +930,7 @@ impl ToolbarItemView for ProjectSearchBar {
        self.active_project_search = None;
        if let Some(search) = active_pane_item.and_then(|i| i.downcast::<ProjectSearchView>()) {
            let query_editor = search.read(cx).query_editor.clone();
-            cx.reparent(query_editor);
+            cx.reparent(&query_editor);
            self.subscription = Some(cx.observe(&search, |_, _, cx| cx.notify()));
            self.active_project_search = Some(search);
            ToolbarItemLocation::PrimaryLeft {
--- a/crates/settings/Cargo.toml
+++ b/crates/settings/Cargo.toml
@@ -20,12 +20,13 @@ fs = { path = "../fs" }
 anyhow = "1.0.38"
 futures = "0.3"
 theme = { path = "../theme" }
+staff_mode = { path = "../staff_mode" }
 util = { path = "../util" }
 json_comments = "0.2"
 postage = { workspace = true }
 schemars = "0.8"
 serde = { workspace = true }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde_derive = { workspace = true }
 serde_json = { workspace = true }
 serde_path_to_error = "0.1.4"
 toml = "0.5"
@@ -36,3 +37,4 @@ tree-sitter-json = "*"
 unindent = "0.1"
 gpui = { path = "../gpui", features = ["test-support"] }
 fs = { path = "../fs", features = ["test-support"] }
+pretty_assertions = "1.3.0"
--- a/crates/settings/src/settings.rs
+++ b/crates/settings/src/settings.rs
@@ -21,7 +21,7 @@ use sqlez::{
 use std::{collections::HashMap, num::NonZeroU32, str, sync::Arc};
 use theme::{Theme, ThemeRegistry};
 use tree_sitter::Query;
-use util::ResultExt as _;
+use util::{RangeExt, ResultExt as _};

 pub use keymap_file::{keymap_file_json_schema, KeymapFileContent};
 pub use watched_json::watch_files;
@@ -32,6 +32,7 @@ pub struct Settings {
    pub buffer_font_features: fonts::Features,
    pub buffer_font_family: FamilyId,
    pub default_buffer_font_size: f32,
+    pub enable_copilot_integration: bool,
    pub buffer_font_size: f32,
    pub active_pane_magnification: f32,
    pub cursor_blink: bool,
@@ -60,6 +61,29 @@ pub struct Settings {
    pub base_keymap: BaseKeymap,
 }

+#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq, Default)]
+#[serde(rename_all = "snake_case")]
+pub enum CopilotSettings {
+    #[default]
+    On,
+    Off,
+}
+
+impl From<CopilotSettings> for bool {
+    fn from(value: CopilotSettings) -> Self {
+        match value {
+            CopilotSettings::On => true,
+            CopilotSettings::Off => false,
+        }
+    }
+}
+
+impl CopilotSettings {
+    pub fn is_on(&self) -> bool {
+        <CopilotSettings as Into<bool>>::into(*self)
+    }
+}
+
 #[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq, Default)]
 pub enum BaseKeymap {
    #[default]
@@ -153,6 +177,43 @@ pub struct EditorSettings {
    pub ensure_final_newline_on_save: Option<bool>,
    pub formatter: Option<Formatter>,
    pub enable_language_server: Option<bool>,
+    #[schemars(skip)]
+    pub copilot: Option<OnOff>,
+}
+
+#[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
+#[serde(rename_all = "snake_case")]
+pub enum OnOff {
+    On,
+    Off,
+}
+
+impl OnOff {
+    pub fn as_bool(&self) -> bool {
+        match self {
+            OnOff::On => true,
+            OnOff::Off => false,
+        }
+    }
+
+    pub fn from_bool(value: bool) -> OnOff {
+        match value {
+            true => OnOff::On,
+            false => OnOff::Off,
+        }
+    }
+}
+
+impl From<OnOff> for bool {
+    fn from(value: OnOff) -> bool {
+        value.as_bool()
+    }
+}
+
+impl From<bool> for OnOff {
+    fn from(value: bool) -> OnOff {
+        OnOff::from_bool(value)
+    }
 }

 #[derive(Copy, Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
@@ -375,6 +436,9 @@ pub struct SettingsFileContent {
    pub auto_update: Option<bool>,
    #[serde(default)]
    pub base_keymap: Option<BaseKeymap>,
+    #[serde(default)]
+    #[schemars(skip)]
+    pub enable_copilot_integration: Option<bool>,
 }

 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq, JsonSchema)]
@@ -436,6 +500,7 @@ impl Settings {
                format_on_save: required(defaults.editor.format_on_save),
                formatter: required(defaults.editor.formatter),
                enable_language_server: required(defaults.editor.enable_language_server),
+                copilot: required(defaults.editor.copilot),
            },
            editor_overrides: Default::default(),
            git: defaults.git.unwrap(),
@@ -452,6 +517,7 @@ impl Settings {
            telemetry_overrides: Default::default(),
            auto_update: defaults.auto_update.unwrap(),
            base_keymap: Default::default(),
+            enable_copilot_integration: defaults.enable_copilot_integration.unwrap(),
        }
    }

@@ -503,6 +569,10 @@ impl Settings {
        merge(&mut self.autosave, data.autosave);
        merge(&mut self.default_dock_anchor, data.default_dock_anchor);
        merge(&mut self.base_keymap, data.base_keymap);
+        merge(
+            &mut self.enable_copilot_integration,
+            data.enable_copilot_integration,
+        );

        self.editor_overrides = data.editor;
        self.git_overrides = data.git.unwrap_or_default();
@@ -526,6 +596,14 @@ impl Settings {
        self
    }

+    pub fn copilot_on(&self, language: Option<&str>) -> bool {
+        if self.enable_copilot_integration {
+            self.language_setting(language, |settings| settings.copilot.map(Into::into))
+        } else {
+            false
+        }
+    }
+
    pub fn tab_size(&self, language: Option<&str>) -> NonZeroU32 {
        self.language_setting(language, |settings| settings.tab_size)
    }
@@ -662,6 +740,7 @@ impl Settings {
                format_on_save: Some(FormatOnSave::On),
                formatter: Some(Formatter::LanguageServer),
                enable_language_server: Some(true),
+                copilot: Some(OnOff::On),
            },
            editor_overrides: Default::default(),
            journal_defaults: Default::default(),
@@ -681,6 +760,7 @@ impl Settings {
            telemetry_overrides: Default::default(),
            auto_update: true,
            base_keymap: Default::default(),
+            enable_copilot_integration: true,
        }
    }

@@ -701,6 +781,7 @@ pub fn settings_file_json_schema(
        settings.option_add_null_type = false;
    });
    let generator = SchemaGenerator::new(settings);
+
    let mut root_schema = generator.into_root_schema_for::<SettingsFileContent>();

    // Create a schema for a theme name.
@@ -713,6 +794,7 @@ pub fn settings_file_json_schema(
    // Create a schema for a 'languages overrides' object, associating editor
    // settings with specific langauges.
    assert!(root_schema.definitions.contains_key("EditorSettings"));
+
    let languages_object_schema = SchemaObject {
        instance_type: Some(SingleOrVec::Single(Box::new(InstanceType::Object))),
        object: Some(Box::new(ObjectValidation {
@@ -770,6 +852,9 @@ pub fn parse_json_with_comments<T: DeserializeOwned>(content: &str) -> Result<T>
 }

 fn write_settings_key(settings_content: &mut String, key_path: &[&str], new_value: &Value) {
+    const LANGUAGE_OVERRIDES: &'static str = "language_overrides";
+    const LANGAUGES: &'static str = "languages";
+
    let mut parser = tree_sitter::Parser::new();
    parser.set_language(tree_sitter_json::language()).unwrap();
    let tree = parser.parse(&settings_content, None).unwrap();
@@ -786,7 +871,10 @@ fn write_settings_key(settings_content: &mut String, key_path: &[&str], new_valu
    )
    .unwrap();

+    let has_language_overrides = settings_content.contains(LANGUAGE_OVERRIDES);
+
    let mut depth = 0;
+    let mut last_value_range = 0..0;
    let mut first_key_start = None;
    let mut existing_value_range = 0..settings_content.len();
    let matches = cursor.matches(&query, tree.root_node(), settings_content.as_bytes());
@@ -798,6 +886,14 @@ fn write_settings_key(settings_content: &mut String, key_path: &[&str], new_valu
        let key_range = mat.captures[0].node.byte_range();
        let value_range = mat.captures[1].node.byte_range();

+        // Don't enter sub objects until we find an exact
+        // match for the current keypath
+        if last_value_range.contains_inclusive(&value_range) {
+            continue;
+        }
+
+        last_value_range = value_range.clone();
+
        if key_range.start > existing_value_range.end {
            break;
        }
@@ -806,11 +902,19 @@ fn write_settings_key(settings_content: &mut String, key_path: &[&str], new_valu

        let found_key = settings_content
            .get(key_range.clone())
-            .map(|key_text| key_text == format!("\"{}\"", key_path[depth]))
+            .map(|key_text| {
+                if key_path[depth] == LANGAUGES && has_language_overrides {
+                    return key_text == format!("\"{}\"", LANGUAGE_OVERRIDES);
+                } else {
+                    return key_text == format!("\"{}\"", key_path[depth]);
+                }
+            })
            .unwrap_or(false);

        if found_key {
            existing_value_range = value_range;
+            // Reset last value range when increasing in depth
+            last_value_range = existing_value_range.start..existing_value_range.start;
            depth += 1;

            if depth == key_path.len() {
@@ -828,12 +932,20 @@ fn write_settings_key(settings_content: &mut String, key_path: &[&str], new_valu
        settings_content.replace_range(existing_value_range, &new_val);
    } else {
        // We have key paths, construct the sub objects
-        let new_key = key_path[depth];
+        let new_key = if has_language_overrides && key_path[depth] == LANGAUGES {
+            LANGUAGE_OVERRIDES
+        } else {
+            key_path[depth]
+        };

        // We don't have the key, construct the nested objects
        let mut new_value = serde_json::to_value(new_value).unwrap();
        for key in key_path[(depth + 1)..].iter().rev() {
-            new_value = serde_json::json!({ key.to_string(): new_value });
+            if has_language_overrides && key == &LANGAUGES {
+                new_value = serde_json::json!({ LANGUAGE_OVERRIDES.to_string(): new_value });
+            } else {
+                new_value = serde_json::json!({ key.to_string(): new_value });
+            }
        }

        if let Some(first_key_start) = first_key_start {
@@ -852,7 +964,8 @@ fn write_settings_key(settings_content: &mut String, key_path: &[&str], new_valu
            }

            if row > 0 {
-                let new_val = to_pretty_json(&new_value, column, column);
+                // depth is 0 based, but division needs to be 1 based.
+                let new_val = to_pretty_json(&new_value, column / (depth + 1), column);
                let content = format!(r#""{new_key}": {new_val},"#);
                settings_content.insert_str(first_key_start, &content);

@@ -912,13 +1025,28 @@ fn to_pretty_json(

 pub fn update_settings_file(
    mut text: String,
-    old_file_content: SettingsFileContent,
+    mut old_file_content: SettingsFileContent,
    update: impl FnOnce(&mut SettingsFileContent),
 ) -> String {
    let mut new_file_content = old_file_content.clone();

    update(&mut new_file_content);

+    if new_file_content.languages.len() != old_file_content.languages.len() {
+        for language in new_file_content.languages.keys() {
+            old_file_content
+                .languages
+                .entry(language.clone())
+                .or_default();
+        }
+        for language in old_file_content.languages.keys() {
+            new_file_content
+                .languages
+                .entry(language.clone())
+                .or_default();
+        }
+    }
+
    let old_object = to_json_object(old_file_content);
    let new_object = to_json_object(new_file_content);

@@ -931,6 +1059,7 @@ pub fn update_settings_file(
        for (key, old_value) in old_object.iter() {
            // We know that these two are from the same shape of object, so we can just unwrap
            let new_value = new_object.get(key).unwrap();
+
            if old_value != new_value {
                match new_value {
                    Value::Bool(_) | Value::Number(_) | Value::String(_) => {
@@ -986,7 +1115,113 @@ mod tests {
        let old_json = old_json.into();
        let old_content: SettingsFileContent = serde_json::from_str(&old_json).unwrap_or_default();
        let new_json = update_settings_file(old_json, old_content, update);
-        assert_eq!(new_json, expected_new_json.into());
+        pretty_assertions::assert_eq!(new_json, expected_new_json.into());
+    }
+
+    #[test]
+    fn test_update_language_overrides_copilot() {
+        assert_new_settings(
+            r#"
+                {
+                    "language_overrides": {
+                        "JSON": {
+                            "copilot": "off"
+                        }
+                    }
+                }
+            "#
+            .unindent(),
+            |settings| {
+                settings.languages.insert(
+                    "Rust".into(),
+                    EditorSettings {
+                        copilot: Some(OnOff::On),
+                        ..Default::default()
+                    },
+                );
+            },
+            r#"
+                {
+                    "language_overrides": {
+                        "Rust": {
+                            "copilot": "on"
+                        },
+                        "JSON": {
+                            "copilot": "off"
+                        }
+                    }
+                }
+            "#
+            .unindent(),
+        );
+    }
+
+    #[test]
+    fn test_update_copilot() {
+        assert_new_settings(
+            r#"
+                {
+                    "languages": {
+                        "JSON": {
+                            "copilot": "off"
+                        }
+                    }
+                }
+            "#
+            .unindent(),
+            |settings| {
+                settings.editor.copilot = Some(OnOff::On);
+            },
+            r#"
+                {
+                    "copilot": "on",
+                    "languages": {
+                        "JSON": {
+                            "copilot": "off"
+                        }
+                    }
+                }
+            "#
+            .unindent(),
+        );
+    }
+
+    #[test]
+    fn test_update_langauge_copilot() {
+        assert_new_settings(
+            r#"
+                {
+                    "languages": {
+                        "JSON": {
+                            "copilot": "off"
+                        }
+                    }
+                }
+            "#
+            .unindent(),
+            |settings| {
+                settings.languages.insert(
+                    "Rust".into(),
+                    EditorSettings {
+                        copilot: Some(OnOff::On),
+                        ..Default::default()
+                    },
+                );
+            },
+            r#"
+                {
+                    "languages": {
+                        "Rust": {
+                            "copilot": "on"
+                        },
+                        "JSON": {
+                            "copilot": "off"
+                        }
+                    }
+                }
+            "#
+            .unindent(),
+        );
    }

    #[test]
--- a/crates/staff_mode/Cargo.toml
+++ b/crates/staff_mode/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "staff_mode"
+version = "0.1.0"
+edition = "2021"
+publish = false
+
+[lib]
+path = "src/staff_mode.rs"
+
+[dependencies]
+gpui = { path = "../gpui" }
+anyhow = "1.0.38"
--- a/crates/staff_mode/src/staff_mode.rs
+++ b/crates/staff_mode/src/staff_mode.rs
@@ -0,0 +1,42 @@
+use gpui::MutableAppContext;
+
+#[derive(Debug, Default)]
+pub struct StaffMode(pub bool);
+
+impl std::ops::Deref for StaffMode {
+    type Target = bool;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+/// Despite what the type system requires me to tell you, the init function will only be called a once
+/// as soon as we know that the staff mode is enabled.
+pub fn staff_mode<F: FnMut(&mut MutableAppContext) + 'static>(
+    cx: &mut MutableAppContext,
+    mut init: F,
+) {
+    if **cx.default_global::<StaffMode>() {
+        init(cx)
+    } else {
+        let mut once = Some(());
+        cx.observe_global::<StaffMode, _>(move |cx| {
+            if **cx.global::<StaffMode>() && once.take().is_some() {
+                init(cx);
+            }
+        })
+        .detach();
+    }
+}
+
+/// Immediately checks and runs the init function if the staff mode is not enabled.
+/// This is only included for symettry with staff_mode() above
+pub fn not_staff_mode<F: FnOnce(&mut MutableAppContext) + 'static>(
+    cx: &mut MutableAppContext,
+    init: F,
+) {
+    if !**cx.default_global::<StaffMode>() {
+        init(cx)
+    }
+}
--- a/crates/terminal/Cargo.toml
+++ b/crates/terminal/Cargo.toml
@@ -29,8 +29,8 @@ libc = "0.2"
 anyhow = "1"
 thiserror = "1.0"
 lazy_static = "1.4.0"
-serde = { version = "1.0", features = ["derive"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }

 [dev-dependencies]
 rand = "0.8.5"
--- a/crates/terminal_view/Cargo.toml
+++ b/crates/terminal_view/Cargo.toml
@@ -33,8 +33,8 @@ libc = "0.2"
 anyhow = "1"
 thiserror = "1.0"
 lazy_static = "1.4.0"
-serde = { version = "1.0", features = ["derive"] }
-serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
+serde = { workspace = true }
+serde_derive = { workspace = true }



--- a/Show More
+++ b/Show More
				`@@ -0,0 +1 @@`
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