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ec911dc8b9
clutter_stage_set_paint_callback() has the disadvantage that it only works for a single caller, and subsequent callers will overwrite and break previous callers. Replace it with an ::after-paint signal that is emitted at the same point - after all painting for the stage is completed but before the drawing is presented to the screen. https://bugzilla.gnome.org/show_bug.cgi?id=732342