Fix for webengine too

qutebrowser/browser/browsertab.py

@@ -560,6 +560,7 @@ class AbstractTab(QWidget):
         self._mouse_event_filter = mouse.MouseEventFilter(
             self, widget_class=self.WIDGET_CLASS, parent=self)
         self.backend = None
+        self.needs_qtbug54419_workaround = False
 
         # FIXME:qtwebengine  Should this be public api via self.hints?
         #                    Also, should we get it out of objreg?

qutebrowser/browser/webkit/webkittab.py

@@ -607,7 +607,6 @@ class WebKitTab(browsertab.AbstractTab):
         self._connect_signals()
         self.zoom.set_default()
         self.backend = usertypes.Backend.QtWebKit
-        self.needs_qtbug54419_workaround = False
 
     def _install_event_filter(self):
         self._widget.installEventFilter(self._mouse_event_filter)