Insure that browser keys are not sent when a browser is not focused.

src/cthulhu/input_event_manager.py

@@ -590,6 +590,20 @@ class InputEventManager:
 
         return result
 
+    def _clear_stale_atspi_context(self, manager: Any) -> None:
+        """Clears cached input context after X11 positively contradicts AT-SPI."""
+
+        reason = "active X11 window not found in AT-SPI"
+        msg = (
+            "INPUT EVENT MANAGER: Clearing stale AT-SPI focus context; "
+            "X11 focus moved to an untracked window."
+        )
+        debug.print_message(debug.LEVEL_INFO, msg, True)
+        script_manager.get_manager().set_active_script(None, reason)
+        manager.clear_state(reason)
+        self._last_input_event = None
+        self._last_non_modifier_key_event = None
+
     @staticmethod
     def _get_active_script_app() -> Optional[Atspi.Accessible]:
         """Returns the app for the active script, if one is available."""
@@ -743,6 +757,11 @@ class InputEventManager:
                     manager.set_active_window(window)
                 else:
                     focus_window = self._get_top_level_window(pendingFocus or manager.get_locus_of_focus())
+                    staleContext = focus_window or window or self._get_active_script_app()
+                    if self._active_x11_window_differs_from(staleContext):
+                        self._clear_stale_atspi_context(manager)
+                        return False
+
                     if focus_window is not None:
                         window = focus_window
                         tokens = [
@@ -755,15 +774,6 @@ class InputEventManager:
                         # One example: Brave's popup menus live in frames which lack the active
                         # state. Failing to revalidate the window on a key press is inconclusive;
                         # do not wipe out the last known window and focus state.
-                        focus = pendingFocus or manager.get_locus_of_focus()
-                        staleContext = window or self._get_active_script_app()
-                        if self._active_x11_window_differs_from(staleContext):
-                            msg = (
-                                "INPUT EVENT MANAGER: X11 focus moved to an untracked window; "
-                                "preserving Cthulhu key handling."
-                            )
-                            debug.print_message(debug.LEVEL_INFO, msg, True)
-
                         tokens = [
                             "WARNING:",
                             window,