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If the app finished multiple frames before we sent _NET_WM_FRAME_DRAWN, we could add the send_frame_messages_timer multiple times. In the rare case that the app immediately closed the window, the older timeout could potentially then run on the freed actor. https://bugzilla.gnome.org/show_bug.cgi?id=738686
Intro ===== Fix me. Env Vars ======== MUTTER_DISABLE_MIPMAPS - set to disable use of mipmaped windows.