Fix stuff, apply ruff rules.

tests/test_input_event_manager.py

@@ -348,6 +348,29 @@ class TestInputEventManager:
         if case["expects_debug_call"]:
             essential_modules["cthulhu.debug"].print_tokens.assert_called()
 
+    def test_add_grabs_for_keybinding_allows_default_cthulhu_modifiers(
+        self,
+        test_context: CthulhuTestContext,
+    ) -> None:
+        """Plugin bindings can be grabbed before a script supplies modifier keys."""
+
+        input_event_manager, _essential_modules = self._setup_input_event_manager(test_context)
+
+        mock_device = test_context.Mock()
+        mock_device.add_key_grab.return_value = 123
+        input_event_manager._device = mock_device
+
+        mock_kd = test_context.Mock()
+        mock_binding = test_context.Mock()
+        mock_binding.has_grabs.return_value = False
+        mock_binding.key_definitions.return_value = [mock_kd]
+
+        result = input_event_manager.add_grabs_for_keybinding(mock_binding)
+
+        assert result == [123]
+        mock_binding.key_definitions.assert_called_once_with(None)
+        mock_device.add_key_grab.assert_called_once_with(mock_kd, None)
+
     @pytest.mark.parametrize(
         "case",
         [