Ensure that auto hide widget will be closed if user starts dragging floating widget or docked widget

src/DockAreaTitleBar.cpp

@@ -302,6 +302,7 @@ void DockAreaTitleBarPrivate::startFloating(const QPoint& Offset)
 		DockArea->autoHideDockContainer()->hide();
 	}
 	FloatingWidget = makeAreaFloating(Offset, DraggingFloatingWidget);
+	qApp->postEvent(DockArea, new QEvent((QEvent::Type)internal::DockedWidgetDragStartEvent));
 }