2004-12-14  Michael Natterer  <mitch@gimp.org>

	* app/plug-in/plug-in-proc-frame.[ch]: added "gint ref_count" to
	the PlugInProcFrame struct. Added new functions
	plug_in_proc_frame_ref/unref().

	(plug_in_proc_frame_new): set the ref_count to 1.

	* app/plug-in/plug-in.[ch] (plug_in_proc_frame_push): return the
	new proc_frame.

	(plug_in_proc_frame_pop): use unref() instead of free().

	* app/plug-in/plug-in-run.c (plug_in_temp_run): ref the proc_frame
	while running its main loop. Removed the call to
	plug_in_proc_frame_pop().

	* app/plug-in/plug-in-message.c (plug_in_handle_temp_proc_return):
	call plug_in_proc_frame_pop() immediately after
	plug_in_main_loop_quit() so the proc_frame goes away from the
	stack and can't be used accidentially if the core is too busy to
	return to the main loop before the next command arrives on the
	wire. Really fixes bug #161114 this time.