2002-09-01  Michael Natterer  <mitch@gimp.org>

	Refcount layer masks correctly. Fixes layer mask undo.

	* app/core/gimplayer.c (gimp_layer_add_mask): ref the mask.

	* app/xcf/xcf-load.c
	* app/gui/layers-commands.c
	* tools/pdbgen/pdb/image.pdb: unref layer masks after adding them.

	* app/pdb/image_cmds.c: regenerated.