// Note: as per xdg-shell protocol, the compositor has to
		// handle state requests by sending a configure event,
		// even if it didn't actually change the state. Therefore,
		// every compositor implementing xdg-shell support *must*
		// listen to these signals and schedule a configure event
		// immediately or at some time in the future; not doing so
		// is a protocol violation.
		struct wl_signal request_maximize;
		struct wl_signal request_fullscreen;
		
		struct wl_signal request_minimize;
		struct wl_signal request_move;
		struct wl_signal request_resize;
		struct wl_signal request_show_window_menu;
		struct wl_signal set_parent;
		struct wl_signal set_title;
		struct wl_signal set_app_id;