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9d4c7e4e75
After 20176d03, the Wayland backend only synchronizes with the compositor after a geometry was set, and it was different from the current geometry. That commit was mistakenly comparing the geometry before chaining up, which would yield a false negative on the case where the client didn't call set_geometry() before commit(). Fix that by caching the old geometry locally, chain up (and thus apply the new geometry rectangle), then comparing the old and current geometry rectangles. Fixes https://gitlab.gnome.org/GNOME/mutter/issues/150 (cherry picked from commit cf734999fb9e342811896f70f7c1f415462728a7)