2009-03-25  Vincent Untz  <vuntz@gnome.org>

	Allow an interacting app to cancel the logout.

	* gnome-session/gsm-client.[ch]: (gsm_client_class_init): add new
	cancel argument to END_SESSION_RESPONSE signal
	(gdm_client_end_session_response): add cancel and use it
	* gnome-session/gsm-marshal.list: updated for new signature
	* gnome-session/gsm-manager.c: (on_client_end_session_response): add
	cancel paramter, and call cancel_end_session if cancel is TRUE
	* gnome-session/gsm-dbus-client.c: (handle_end_session_response): pass
	FALSE as cancel
	* gnome-session/gsm-xsmp-client.c:
	(save_yourself_phase2_request_callback): pass FALSE as cancel
	(interact_request_callback): pass FALSE as cancel
	(interact_done_callback): pass the value returned by the client as
	cancel
	(save_yourself_done_callback): pass FALSE as cancel

svn path=/trunk/; revision=5359