2004-08-11  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpprogress.[ch]: added virtual function
	gboolean GimpProgressInterface::is_active().

	* app/display/gimpdisplay.c
	* app/display/gimpstatusbar.c
	* app/widgets/gimpfiledialog.c
	* app/widgets/gimpprogressbox.c
	* app/widgets/gimpprogressdialog.c
	* app/widgets/gimpthumbbox.c: implement it.

	* app/plug-in/plug-in.h: removed "gboolean progress_active" and
	added "gulong progress_cancel_id" instead.

	* app/plug-in/plug-in-progress.c: changed accordingly. Make sure
	we correctly handle the "cancel" connections of progress instances
	passed from other plug-ins.