ABMv

Results 1 issues of ABMv

1. Run example "kddockwidgets_example"; 2. Tabify at MainWindow "DockWidget #0", "DockWidget #1", "DockWidget #2" ![image](https://user-images.githubusercontent.com/7323010/107363731-fd0cbe00-6af3-11eb-9258-56d187ff765e.png) 3. Undock by mouse "DockWidget #1"; 4. Undock by mouse "DockWidget #2"; 5. Dock "DockWidget...

enhancement
hard_to_do