[Gui] Fix regressions from PR7771...

specifically 7458912b33 fixes #7965 #8440

src/Gui/ToolBarManager.cpp

@@ -182,6 +182,12 @@ void ToolBarManager::setup(ToolBarItem* toolBarItems)
     static QPointer<QWidget> _ActionWidget;
     if (!_ActionWidget) {
         _ActionWidget = new QWidget(getMainWindow());
+        _ActionWidget->setObjectName(QStringLiteral("_fc_action_widget_"));
+		// Although _ActionWidget has zero size, on MacOS it somehow has a
+		// 'phantom' size without any visible content and will block the top
+		// left tool buttons of the application main window. So we move it out
+		// of the way.
+		_ActionWidget->move(QPoint(-100,-100));
     }
     else {
         for (auto action : _ActionWidget->actions())