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If a queued event is being processed after the surface is destroyed, trying to access the window associated with the surface will lead to a segmentation fault. This patch avoids the crash by first checking if the surface is not null. https://bugzilla.gnome.org/show_bug.cgi?id=754715
Intro ===== Fix me. Env Vars ======== MUTTER_DISABLE_MIPMAPS - set to disable use of mipmaped windows.