
The _MUTTER_FRAME_EXTENTS need to have the correct size before the window is shown, otherwise the client window size will effectively have the headarbar height subtracted when initially syncing the frame/client geometries. This reverts commit f10b3eac62cfaa015984584a12567e6a59869b61. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3628>