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When a state changed, e.g. a window went from unfullscreen to fullscreen, always sync the window geometry, otherwise a compositor application (e.g. gnome-shell) might end up with an unfinished window state transition effect. Without always syncing, the compositor plugin will see a 'size-change' event, as a result of the state change, but if the size didn't change, it would never see the 'size-changed' event. If an effect, for example gnome-shell's fullscreen effect, is triggered on 'size-change' it might rely on the actual size change to not get stuck. This commit allows it to have this dependency. This fixes a bug where a fullscreen effect gets "stuck" when a window goes fullscreen without changing the window geometry. https://bugzilla.gnome.org/show_bug.cgi?id=780292