After more experimenting it looks like a compiz regression, probably sometime in march. I verified that the bug can't be reproduced with gnome-shell and it can be reproduced with gnome fallback session, with compiz but no unity. There were several fixes in late march related to window decoration related regressions.
After more experimenting it looks like a compiz regression, probably sometime in march. I verified that the bug can't be reproduced with gnome-shell and it can be reproduced with gnome fallback session, with compiz but no unity. There were several fixes in late march related to window decoration related regressions.