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It would be good to have an undock action like with the normal dockable manager :
I would like to right click on a dockable button and ask undock in the menu so the panel is undocked without being loaded
This feature was added in one of the recent commits. There's now a button with the 'x' icon, with the tooltip "Remove dockable completely", which has the same affect as right-clicking the title and selecting 'Remove', which does just that - what was called 'Undock' in the classic DockableWindowManager.