A workaround was released in Unity 2D some time ago (milestone 3.8.8):
we activated Metacity's compositor by default
** Changed in: unity-2d
Status: In Progress => Fix Released
** Changed in: unity-2d
Milestone: 3.8.10 => None
** Changed in: unity-2d (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/775508
Title:
Windows fail to repaint where popup windows appeared before
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