QDockWidget dockable with other QDockwidgets

[fellobo]

Okay, so I have a QMainWindow and it creates QDockWidgets but what I would like to have happen is float a 2 QDockWidgets but have them dock to themselves. Is there a way to do this?

[jpn]

Just an idea:
Install an event filter for both dock widgets, check for move and resize events, and put them in a QSplitter when they are close enough.