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We ignore all damage while a surface is frozen and queue a full update instead once it's thawed. While not super efficient, this isn't overly bad for the intended case of catching up with any updates that happened during a compositor effect. However when extended frame sync is used, surfaces are also frozen while the client is drawing a frame, in which case the current behavior is pretty damaging (pun intended), as we end up redrawing the entire window each frame. To address this, keep track of the actual damage we ignore and apply it when the surface is thawed. https://bugzilla.gnome.org/show_bug.cgi?id=767798