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There's two meanings of "frame" there! Since SSD frames are now rendered by an external client, and there are no actual mechanism that ensures the frame did already get painted when the client did respond to its NET_WM_FRAME_SYNC_REQUEST request, there may be artifacts when resizing windows. In order to get always the best visual result, we should actually synchronize rendering with both the client window and the window frame window. This commit adds these mechanisms, so a sync alarm update is expected on both windows until further resizes are allowed, this ensures window and frame stay in sync, even after moving rendering elsewhere. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2175>