agent: Register tracked buffers with language servers (#28610)

Release Notes:

- agent: Start language servers when accessing files via tools

Co-authored-by: Michael <michael@zed.dev>

crates/assistant_tool/src/action_log.rs

@@ -4,7 +4,7 @@ use collections::BTreeMap;
 use futures::{StreamExt, channel::mpsc};
 use gpui::{App, AppContext, AsyncApp, Context, Entity, Subscription, Task, WeakEntity};
 use language::{Anchor, Buffer, BufferEvent, DiskState, Point};
-use project::{Project, ProjectItem};
+use project::{Project, ProjectItem, lsp_store::OpenLspBufferHandle};
 use std::{cmp, ops::Range, sync::Arc};
 use text::{Edit, Patch, Rope};
 use util::RangeExt;
@@ -49,6 +49,10 @@ impl ActionLog {
             .tracked_buffers
             .entry(buffer.clone())
             .or_insert_with(|| {
+                let open_lsp_handle = self.project.update(cx, |project, cx| {
+                    project.register_buffer_with_language_servers(&buffer, cx)
+                });
+
                 let text_snapshot = buffer.read(cx).text_snapshot();
                 let diff = cx.new(|cx| BufferDiff::new(&text_snapshot, cx));
                 let (diff_update_tx, diff_update_rx) = mpsc::unbounded();
@@ -76,6 +80,7 @@ impl ActionLog {
                     version: buffer.read(cx).version(),
                     diff,
                     diff_update: diff_update_tx,
+                    _open_lsp_handle: open_lsp_handle,
                     _maintain_diff: cx.spawn({
                         let buffer = buffer.clone();
                         async move |this, cx| {
@@ -615,6 +620,7 @@ struct TrackedBuffer {
     diff: Entity<BufferDiff>,
     snapshot: text::BufferSnapshot,
     diff_update: mpsc::UnboundedSender<(ChangeAuthor, text::BufferSnapshot)>,
+    _open_lsp_handle: OpenLspBufferHandle,
     _maintain_diff: Task<()>,
     _subscription: Subscription,
 }