Comment # 7 on bug 1022050 from Stefan Dirsch

I've just git bisected the issue with "Xephyr -glamor" and found the following
commit in xorg-server, which appears to fix this:

743b6f231e999d8b2909228412266dc13cc433c5 is the first fixed commit
commit 743b6f231e999d8b2909228412266dc13cc433c5
Author: Keith Packard <keithp@keithp.com>
Date:   Fri May 13 04:25:43 2016 -0700

    glamor: Disable logic ops when doing compositing [v4]

This needs confirmation though. Question is also, whether this fix alone is
applicable for xorg-server in Leap 42.2.