I can't see any bug in your test program right now. But I also can't
explain it.
If the root window was constantly getting damaged though, Show Repaint
would be flashing the whole screen and Compiz' CPU would be higher.
I see two possible explanations:
1. A bug in your program (which I can't see)
2. Compiz is choosing to ignore damage to the root window (which I doubt,
because it does smoothly respond to root window redraws)
Both seem quite unlikely. Maybe there's a third explanation... ?
** Project changed: unity => compiz
** Also affects: compiz (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1100456
Title:
Every screen change triggers full screen XDamage event
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