Fix esc (#2661)

Esc should have other functionalities when it's not used in a
backtracking situation. i.e. to cancel pop up menu when selecting
model/approvals or to interrupt an active turn.

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

@@ -307,6 +307,11 @@ impl ChatComposer {
         result
     }
 
+    /// Return true if either the slash-command popup or the file-search popup is active.
+    pub(crate) fn popup_active(&self) -> bool {
+        !matches!(self.active_popup, ActivePopup::None)
+    }
+
     /// Handle key event when the slash-command popup is visible.
     fn handle_key_event_with_slash_popup(&mut self, key_event: KeyEvent) -> (InputResult, bool) {
         let ActivePopup::Command(popup) = &mut self.active_popup else {
@@ -327,6 +332,13 @@ impl ChatComposer {
                 popup.move_down();
                 (InputResult::None, true)
             }
+            KeyEvent {
+                code: KeyCode::Esc, ..
+            } => {
+                // Dismiss the slash popup; keep the current input untouched.
+                self.active_popup = ActivePopup::None;
+                (InputResult::None, true)
+            }
             KeyEvent {
                 code: KeyCode::Tab, ..
             } => {