Add XTerm handoff runtime diagnostics

tests/test_runtime_state_snapshot.py

@@ -80,6 +80,10 @@ class RuntimeStateSnapshotTests(unittest.TestCase):
         manager._grabbed_bindings = {10: object(), 11: object()}
         manager._paused = True
         manager._scriptWithSuspendedGrabsForXterm = object()
+        manager._xtermFocusHandlerId = 17
+        manager._xtermRecoverySourceId = 23
+        manager._lastEwmhActiveWindowId = 0x1400010
+        manager._lastEwmhXtermMatch = False
         manager._last_input_event = object()
         manager._last_non_modifier_key_event = None
 
@@ -91,6 +95,10 @@ class RuntimeStateSnapshotTests(unittest.TestCase):
         self.assertEqual(1, snapshot["mapped_keysyms"])
         self.assertEqual(2, snapshot["grabbed_bindings"])
         self.assertTrue(snapshot["suspended_xterm_script_present"])
+        self.assertTrue(snapshot["xterm_focus_monitor_active"])
+        self.assertTrue(snapshot["xterm_recovery_timer_active"])
+        self.assertEqual("0x1400010", snapshot["last_ewmh_active_window_id"])
+        self.assertFalse(snapshot["last_ewmh_xterm_match"])
         self.assertFalse(snapshot["last_non_modifier_key_event_present"])
 
     def test_script_manager_snapshot_reports_cache_counts(self) -> None: