Jeremy Huddleston
0f613007cd
CheckWindowOptionalNeed: Ensure w->optional is set to avoid SEGFAULT
...
If CheckWindowOptionalNeed is called consecutively (and the first removes optional), then
we will SEGFAULT. This can happen in XQuartz because ReparentWindow will call
pScreen->ReparentWindow which can DeleteProperty which will CheckWindowOptionalNeed... then
ReparentWindow will call it again later indiscriminantly.
(cherry picked from commit b608c864ccc59628bd33c033393121b61580460e)
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