Add types for eventfilter/quitter

mypy.ini

@@ -87,6 +87,14 @@ disallow_incomplete_defs = True
 disallow_untyped_defs = True
 disallow_incomplete_defs = True
 
+[mypy-qutebrowser.misc.backendproblem]
+disallow_untyped_defs = True
+disallow_incomplete_defs = True
+
+[mypy-qutebrowser.misc.eventfilter]
+disallow_untyped_defs = True
+disallow_incomplete_defs = True
+
 [mypy-qutebrowser.commands.cmdutils]
 disallow_untyped_defs = True
 disallow_incomplete_defs = True
@@ -127,10 +135,6 @@ disallow_incomplete_defs = True
 disallow_untyped_defs = True
 disallow_incomplete_defs = True
 
-[mypy-qutebrowser.misc.backendproblem]
-disallow_untyped_defs = True
-disallow_incomplete_defs = True
-
 [mypy-qutebrowser.mainwindow.statusbar.command]
 disallow_untyped_defs = True
 disallow_incomplete_defs = True

qutebrowser/keyinput/eventfilter.py

@@ -47,11 +47,11 @@ class EventFilter(QObject):
             QEvent.ShortcutOverride: self._handle_key_event,
         }
 
-    def install(self):
+    def install(self) -> None:
         QApplication.instance().installEventFilter(self)
 
     @pyqtSlot()
-    def shutdown(self):
+    def shutdown(self) -> None:
         QApplication.instance().removeEventFilter(self)
 
     def _handle_key_event(self, event: QKeyEvent) -> bool:
@@ -105,7 +105,8 @@ class EventFilter(QObject):
             raise
 
 
-def init():
+def init() -> None:
+    """Initialize the global EventFilter instance."""
     event_filter = EventFilter(parent=QApplication.instance())
     event_filter.install()
     quitter.instance.shutting_down.connect(event_filter.shutdown)

qutebrowser/misc/quitter.py

@@ -265,7 +265,7 @@ class Quitter(QObject):
         # segfaults.
         QTimer.singleShot(0, functools.partial(self._shutdown_3, status))
 
-    def _shutdown_3(self, status):
+    def _shutdown_3(self, status: int) -> None:
         """Finally shut down the QApplication."""
         log.destroy.debug("Now calling QApplication::exit.")
         if 'debug-exit' in objects.debug_flags: