https://bugs.kde.org/show_bug.cgi?id=199735
SVN commit 1046461 by jacopods:
Avoids a nasty race condition that caused corrupted window decorations
BUG:199735
M +8 -7 client.cpp
M +2 -0 client.h
M +1 -0 composite.cpp
M +6 -0 toplevel.h