Handle dirty tabbar layout correctly

qutebrowser/widgets/mainwindow.py

@@ -165,7 +165,7 @@ class MainWindow(QWidget):
         super().resizeEvent(e)
         self.resize_completion()
         self.downloadview.updateGeometry()
-        self.tabs.tabBar().updateGeometry()
+        self.tabs.tabBar().refresh()
 
     def closeEvent(self, e):
         """Override closeEvent to display a confirmation if needed."""

qutebrowser/widgets/tabwidget.py

@@ -95,7 +95,7 @@ class TabWidget(QTabWidget):
         self.setTabPosition(position)
         tabbar.vertical = position in (QTabWidget.West, QTabWidget.East)
         tabbar.setSelectionBehaviorOnRemove(select_conv[selstr])
-        tabbar.updateGeometry()
+        tabbar.refresh()
 
     @pyqtSlot(str, str)
     def on_config_changed(self, section, _option):
@@ -125,6 +125,13 @@ class TabBar(QTabBar):
         return '<{} with {} tabs>'.format(self.__class__.__name__,
                                           self.count())
 
+    def refresh(self):
+        """Properly repaint the tab bar and relayout tabs."""
+        # This is a horrible hack, but we need to do this so the underlaying Qt
+        # code sets layoutDirty so it actually relayouts the tabs.
+        self.setIconSize(self.iconSize())
+        self.updateGeometry()
+
     def set_tab_indicator_color(self, idx, color):
         """Set the tab indicator color.