
Damage coordinates are relative to the drawable not to the screen. So we have to check whether x and y are 0 and not window_rect.x/y otherwise the herustic will never trigger for windows on monitors whos x and y are not 0. https://bugzilla.gnome.org/show_bug.cgi?id=738271
Intro ===== Fix me. Env Vars ======== MUTTER_DISABLE_MIPMAPS - set to disable use of mipmaped windows.