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0f613007cd43545eda40825bd74ada3e6e5f36f6
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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Truly free fork of the XOrg project.
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