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fixes: #2725
Basically a workaround.
UIManager holds the info about which widget is active and ensures a single active widget.
So widgets can grab the active state when they consume mouse press or release events.
All in all the naming is bad and the system introduces a whole new global state, which is bad.
In addition the name
activeis not intuitive, focused would be more common, but we already have experimental UIFocusGroup, which handle completely different requirements.Guess I have to iterate on this again. But for now we needed some sort of fix