
Implements the "prior window window geometry dimensions" as described in the documentation of 'xdg_toplevel' request 'unset_maximized': "If available and applicable, the compositor will include the window geometry dimensions the window had prior to being maximized in the configure event." and 'unset_fullscreen': "The compositor may include the previous window geometry dimensions in the configure event, if applicable." Fixes https://gitlab.gnome.org/GNOME/mutter/issues/792.