feat: TUI undo op (#5629)

codex-rs/tui/src/bottom_pane/mod.rs

@@ -315,6 +315,11 @@ impl BottomPane {
         self.ctrl_c_quit_hint
     }
 
+    #[cfg(test)]
+    pub(crate) fn status_indicator_visible(&self) -> bool {
+        self.status.is_some()
+    }
+
     pub(crate) fn show_esc_backtrack_hint(&mut self) {
         self.esc_backtrack_hint = true;
         self.composer.set_esc_backtrack_hint(true);
@@ -359,6 +364,16 @@ impl BottomPane {
         }
     }
 
+    pub(crate) fn ensure_status_indicator(&mut self) {
+        if self.status.is_none() {
+            self.status = Some(StatusIndicatorWidget::new(
+                self.app_event_tx.clone(),
+                self.frame_requester.clone(),
+            ));
+            self.request_redraw();
+        }
+    }
+
     pub(crate) fn set_context_window_percent(&mut self, percent: Option<i64>) {
         if self.context_window_percent == percent {
             return;