Fix reviewer shortcuts being inaccessible due to IME

Only tested on Windows, but hopefully resolves the Linux issue as well.

Closes #1952

qt/aqt/reviewer.py

@@ -653,6 +653,12 @@ class Reviewer:
     def _onTypedAnswer(self, val: None) -> None:
         self.typedAnswer = val or ""
         self._showAnswer()
+        self.unfocus_typing_box()
+
+    def unfocus_typing_box(self) -> None:
+        # shifting focus to the bottom area works around a WebEngine/IME bug
+        # https://github.com/ankitects/anki/issues/1952
+        self.bottom.web.setFocus()
 
     # Bottom bar
     ##########################################################################

qt/aqt/webview.py

@@ -293,9 +293,8 @@ class AnkiWebView(QWebEngineView):
                     w.close()
                 else:
                     # in the main window, removes focus from type in area
-                    parent = self.parent()
-                    assert isinstance(parent, QWidget)
-                    parent.setFocus()
+                    if mw.state == "review":
+                        mw.reviewer.unfocus_typing_box()
                 break
             w = w.parent()