2007-09-15  Michael Natterer  <mitch@gimp.org>

	Make layer masks work consistently on layers without alpha.
	Fixes bug #475548.

	* app/core/gimplayer.c (gimp_layer_apply_mask): changed to work
	on layers without alpha.

	* app/actions/layers-commands.c (layers_add_mask_response): don't
	automatically add an alpha channel when adding a layer mask.


svn path=/trunk/; revision=23555