2003-09-04  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpdrawable.[ch]: added new pure virtual function
	GimpDrawable::invalidate_boundary().

	* app/core/gimplayer.[ch]: implement it and removed public
	function gimp_layer_invalidate_boundary().

	* app/core/gimpchannel.[ch]: implement it.

	* app/core/gimpselection.[ch]: implement it and removed public
	function gimp_selection_invalidate().

	* app/core/gimpimage-mask.c (gimp_image_mask_invalidate)
	* app/core/gimpimage-undo-push.c
	* app/core/gimpimage.c
	* app/core/gimplayer-floating-sel.c
	* app/text/gimptextlayer.c: changed accordingly.

	* app/core/gimpchannel.[ch]: made gimp_channel_push_undo() a
	public function and made it call
	gimp_drawable_invalidate_boundary(). Added undo_desc strings for
	all undo pushing functions to GimpChannelClass.

	* app/core/gimpselection.[ch]: removed gimp_selection_push_undo()
	since after the change above it was identical to
	gimp_channel_push_undo().  Don't push any undo here since
	upchaining does the right thing now.  Override GimpChannelClass'
	undo_desc strings to say "Selection".

	* app/core/gimpimage-mask.c (gimp_image_mask_push_undo): changed
	accordingly.