Workaround for AltGr '@' issue.

aqt/webview.py

@@ -84,6 +84,30 @@ class AnkiWebPage(QWebEnginePage):
     def _onCmd(self, str):
         return self._onBridgeCmd(str)
 
+def runJavaScriptSync(page, js, timeout=500):
+    result = None
+    eventLoop = QEventLoop()
+    called = False
+
+    def callback(val):
+        nonlocal result, called
+        result = val
+        called = True
+        eventLoop.quit()
+
+    page.runJavaScript(js, callback)
+
+    if not called:
+        timer = QTimer()
+        timer.setSingleShot(True)
+        timer.timeout.connect(eventLoop.quit)
+        timer.start(timeout)
+        eventLoop.exec_()
+
+    if not called:
+        print('runJavaScriptSync() timed out')
+    return result
+
 # Main web view
 ##########################################################################
 
@@ -119,6 +143,17 @@ class AnkiWebView(QWebEngineView):
             QShortcut(QKeySequence("ctrl+shift+v"), self,
                       context=Qt.WidgetWithChildrenShortcut, activated=self.onPaste)
 
+    def event(self, evt):
+        if evt.type() == QEvent.ShortcutOverride:
+            # alt-gr bug workaround
+            exceptChars = (str(num) for num in range(1, 10))
+            if evt.text() not in exceptChars:
+                js = '["INPUT", "TEXTAREA"].indexOf(document.activeElement.tagName) !== -1'
+                if runJavaScriptSync(self.page(), js, timeout=100):
+                    evt.accept()
+                    return True
+        return QWebEngineView.event(self, evt)
+
     def eventFilter(self, obj, evt):
         # disable pinch to zoom gesture
         if isinstance(evt, QNativeGestureEvent):