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When we get a damage event we update the window by calling meta_shaped_texture_update_area which queues a redraw on the actor. We can avoid that for obscured regions by comparing the damage area to our visible area. This patch causes _NET_WM_FRAME_DRAWN messages to be not sent in some cases where they should be sent; they will be added back in a later commit. https://bugzilla.gnome.org/show_bug.cgi?id=703332
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