Fix stale git diff chip and code review button

app/src/context_chips/current_prompt.rs

@@ -773,6 +773,16 @@ impl CurrentPrompt {
                             output: value.as_ref(),
                             timed_out,
                         });
+                        // GitDiffStats has two value sources that can race when entering a repo:
+                        // this shell fallback (`git diff --shortstat HEAD`, tracked changes only)
+                        // and a repo-status watcher that also counts untracked files. If the
+                        // watcher attached while this fallback was in flight, drop the fallback's
+                        // result
+                        if matches!(chip_kind, ContextChipKind::GitDiffStats)
+                            && me.is_updated_externally(&chip_kind)
+                        {
+                            return;
+                        }
 
                         if timed_out {
                             if suppress_on_failure
@@ -1431,6 +1441,16 @@ impl CurrentPrompt {
             }
         }
 
+        // Repo detached, clear GitDiffStats.
+        if handle.is_none() {
+            if let Some(state) = self.states.get_mut(&ContextChipKind::GitDiffStats) {
+                state.clear_abort_handlers();
+                state.clear_cache();
+            }
+            let _ = self.update_tx.try_send(());
+            return;
+        }
+
         if let Some(weak) = handle {
             if let Some(strong) = weak.upgrade(ctx) {
                 self.git_repo_status = Some(weak);