2004-07-07  Michael Natterer  <mitch@gimp.org>

	Made the undo system robust against the currently pushed undo
	being too large according to prefs settings. Fixes bug #145379.

	* app/core/gimpimage-undo.[ch] (gimp_image_undo_push_undo)
	(gimp_image_undo_group_end): emit "undo-event" *before* calling
	gimp_image_undo_free_space() so the undo history doesn't try to
	remove an item that has never been added.

	(gimp_image_undo_push_undo): added boolean return value indicating
	if the undo could be pushed (FALSE means the undo was to large
	and was discarded right away).

	(gimp_image_undo_push_item): return NULL if the above returned
	FALSE.

	* app/core/gimpimage-undo-push.c (gimp_image_undo_push_text_layer):
	changed accordingly.