2004-09-19  Sven Neumann  <sven@gimp.org>

	Improved undo memory calculation for paint operations (bug #153035):

	* app/base/tile-manager.[ch] (tile_manager_get_memsize): added a
	"gboolean sparse" parameter to get more accurate results for
	sparse tile-managers.

	* app/core/gimpbuffer.c
	* app/core/gimpdrawable.c
	* app/core/gimpimage-undo-push.c
	* app/core/gimpimage.c
	* app/core/gimplayer.c
	* app/core/gimpprojection.c: changed accordingly.