add typehint for eventFilter method

qt/aqt/studydeck.py

@@ -75,7 +75,7 @@ class StudyDeck(QDialog):
         self.redraw("", current)
         self.exec_()
 
-    def eventFilter(self, obj, evt):
+    def eventFilter(self, obj: QObject, evt: QEvent) -> bool:
         if evt.type() == QEvent.KeyPress:
             if evt.key() == Qt.Key_Up:
                 c = self.form.list.count()

qt/aqt/webview.py

@@ -227,7 +227,7 @@ class AnkiWebView(QWebEngineView):  # type: ignore
                 activated=self.onPaste,
             )
 
-    def eventFilter(self, obj, evt):
+    def eventFilter(self, obj: QObject, evt: QEvent) -> bool:
         # disable pinch to zoom gesture
         if isinstance(evt, QNativeGestureEvent):
             return True