Fix black flickering and borders for Xwayland clients during resizes
This part two of !32 (closed) (but a new merge request since !32 (closed) wasn't from a central branch)
The original bug is here https://bugzilla.gnome.org/show_bug.cgi?id=767212
This part two of !32 (closed) (but a new merge request since !32 (closed) wasn't from a central branch)
The original bug is here https://bugzilla.gnome.org/show_bug.cgi?id=767212