2007-01-31  Michael Natterer  <mitch@gimp.org>

	* app/core/Makefile.am
	* app/core/core-types.h
	* app/core/gimplayermaskpropundo.[ch]: new undo class for
	GIMP_UNDO_LAYER_MASK_APPLY and GIMP_UNDO_LAYER_MASK_SHOW.

	* app/core/gimpimage-undo-push.c: use it here.


svn path=/trunk/; revision=21823