Fix sticky header scroll offset (#45377)

Closes #43319

Release Notes:

- Sticky headers no longer obscure the cursor when it moves.

---------

Co-authored-by: HactarCE <6060305+HactarCE@users.noreply.github.com>

crates/editor/src/scroll/autoscroll.rs

@@ -5,7 +5,7 @@ use crate::{
 };
 use gpui::{Bounds, Context, Pixels, Window};
 use language::Point;
-use multi_buffer::Anchor;
+use multi_buffer::{Anchor, ToPoint};
 use std::cmp;
 
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
@@ -186,6 +186,19 @@ impl Editor {
             }
         }
 
+        let style = self.style(cx).clone();
+        let sticky_headers = self.sticky_headers(&style, cx).unwrap_or_default();
+        let visible_sticky_headers = sticky_headers
+            .iter()
+            .filter(|h| {
+                let buffer_snapshot = display_map.buffer_snapshot();
+                let buffer_range =
+                    h.range.start.to_point(buffer_snapshot)..h.range.end.to_point(buffer_snapshot);
+
+                buffer_range.contains(&Point::new(target_top as u32, 0))
+            })
+            .count();
+
         let margin = if matches!(self.mode, EditorMode::AutoHeight { .. }) {
             0.
         } else {
@@ -218,7 +231,7 @@ impl Editor {
         let was_autoscrolled = match strategy {
             AutoscrollStrategy::Fit | AutoscrollStrategy::Newest => {
                 let margin = margin.min(self.scroll_manager.vertical_scroll_margin);
-                let target_top = (target_top - margin).max(0.0);
+                let target_top = (target_top - margin - visible_sticky_headers as f64).max(0.0);
                 let target_bottom = target_bottom + margin;
                 let start_row = scroll_position.y;
                 let end_row = start_row + visible_lines;