ACP follow (#34235)

Closes #ISSUE

Release Notes:

- N/A

---------

Co-authored-by: Agus Zubiaga <agus@zed.dev>
Co-authored-by: Anthony Eid <hello@anthonyeid.me>
Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>

crates/assistant_tool/src/action_log.rs

@@ -8,7 +8,7 @@ use language::{Anchor, Buffer, BufferEvent, DiskState, Point, ToPoint};
 use project::{Project, ProjectItem, lsp_store::OpenLspBufferHandle};
 use std::{cmp, ops::Range, sync::Arc};
 use text::{Edit, Patch, Rope};
-use util::RangeExt;
+use util::{RangeExt, ResultExt as _};
 
 /// Tracks actions performed by tools in a thread
 pub struct ActionLog {
@@ -47,6 +47,10 @@ impl ActionLog {
         self.edited_since_project_diagnostics_check
     }
 
+    pub fn latest_snapshot(&self, buffer: &Entity<Buffer>) -> Option<text::BufferSnapshot> {
+        Some(self.tracked_buffers.get(buffer)?.snapshot.clone())
+    }
+
     fn track_buffer_internal(
         &mut self,
         buffer: Entity<Buffer>,
@@ -715,6 +719,22 @@ impl ActionLog {
         cx.notify();
     }
 
+    pub fn reject_all_edits(&mut self, cx: &mut Context<Self>) -> Task<()> {
+        let futures = self.changed_buffers(cx).into_keys().map(|buffer| {
+            let reject = self.reject_edits_in_ranges(buffer, vec![Anchor::MIN..Anchor::MAX], cx);
+
+            async move {
+                reject.await.log_err();
+            }
+        });
+
+        let task = futures::future::join_all(futures);
+
+        cx.spawn(async move |_, _| {
+            task.await;
+        })
+    }
+
     /// Returns the set of buffers that contain edits that haven't been reviewed by the user.
     pub fn changed_buffers(&self, cx: &App) -> BTreeMap<Entity<Buffer>, Entity<BufferDiff>> {
         self.tracked_buffers