2005-07-29  Sven Neumann  <sven@gimp.org>

	* app/core/gimpundostack.[ch]: added gimp_undo_stack_get_depth().

	* app/widgets/gimpimagepropview.[ch]: display number and memory
	usage of undo/redo steps.

	* app/core/gimpimage-merge.c: fixed signedness issue.