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

	* app/widgets/gimpcontainercombobox.[ch]
	* app/widgets/gimpcontainertreeview.c: when removing the last item
	from the view, manually clear all GimpCellRendererViewables'
	"renderer" properties; otherwise we have stale GimpPreviewRenderers
	with still-refed viewables hanging around in the cells.
	Works around GTK+ bug #149906.