https://bugs.freedesktop.org/show_bug.cgi?id=79862
--- Comment #10 from nucrap@hotmail.com --- Now this is interesting: Only compton and compiz are affected by this bug. I tested it with Kwin and xfwm4 with compositing enabled but it just doesn't happen. Also this bug can only be reproduced once - after that I need to restart my PC to trigger it (relogin is not enough).
Hope this was helpful.