Fix wrong position of overlay at first drag

Author: zyrkiel

src/DockManager.cpp

@@ -507,6 +507,12 @@ CDockManager::CDockManager(QWidget *parent) :
 	CDockContainerWidget(this, parent),
 	d(new DockManagerPrivate(this))
 {
+#ifdef USE_NATIVE_WIDGETS
+	// Force the Dock Manager to be native in order to fix wrong position of overlay
+	// the first time a dock container is dragged
+	winId();
+#endif
+	
 	createRootSplitter();
 	createSideTabBarWidgets();
 	QMainWindow* MainWindow = qobject_cast<QMainWindow*>(parent);