2004-11-24  Michael Natterer  <mitch@gimp.org>

	* app/gui/gui.c (gui_display_changed): if the active display
	becomes NULL (e.g. by closing a view), don't leave the user
	context with an image but no display. Instead, try to find another
	display of the same image instead and if that fails set the image
	to NULL.

	Prevents the various foo_actions_update() functions from being
	called with a NULL display while there is still an active image in
	the context.

	Fixes bug #159304.

	(Removed #warning about being misplaced from that function because
	it's a typical piece of ugly glue code that belongs exactly here).