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47b21b3547
Commit 4f2bb583bf8c changed things so that the compositor used clutter_threads_add_repaint_func_full (CLUTTER_REPAINT_FLAGS_POST_PAINT to get after-paint notification and send _NET_WM_FRAME_DRAWN, but this doesn't actually work, since Clutter will already have blocked for VBlank before calling post-paint functions. The result is that frame synced toolkits like GTK 3.8 will normally only be able to draw every other frame. Since ::paint doesn't work either, a new function clutter_stage_set_paint_callback() has been added to Clutter (and will be included in the 1.14 branch) https://bugzilla.gnome.org/show_bug.cgi?id=698794
