Test for Brecht: this line makes drawing buttons fine.
However note:
- redraws on lines 3107 and 3024 don't do anything
- tooltip timer is messing with redraws too, if you
have tooltips on, it continuously sends redraws.
- I would code tooltip to reset on any mouse move,
and only start timer when mouse is still completely.
That would make them appear much more quietly.
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