2002-08-20  Michael Natterer  <mitch@gimp.org>

	Make sure the selection (gimpimage-mask.c) functionality is really
	built *on top* of the GimpChannel functionality:

	* app/undo.[ch]: renamed undo_push_image_mask() to
	undo_push_mask() and generalized it's API to take a GimpChannel
	param so undos can be pushed for channels which are not the
	image's selection. Simplified the API and added code which copies
	the region of interest instead of leaving this to callers.

	* app/undo_types.h: s/IMAGE_MASK_UNDO/MASK_UNDO/

	* app/undo_history.c: changed accordingly.

	* app/core/gimpchannel.[ch]: don't #include "gimpimage-mask.h".
	Changed gimp_channel_push_undo() to really push a channel undo,
	not a selection undo. Added "gboolean push_undo" params to all
	functions which are called from gimpimage-mask.c. Various cleanups
	and optimizations. Added /*< proxy-foo >*/ stuff to the header so
	we export just the struct itself to libgimpproxy. Added accessors
	gimp_channel_[get|set]_show_masked().

	* app/core/gimpimage-mask.[ch]: renamed gimp_image_mask_undo() to
	gimp_image_mask_push_undo(). Call it before calling GimpChannel
	functions which modify the mask, also call all GimpChannel
	functions with push_undo = FALSE. Emit gimp_image_mask_changed()
	after each operation instead of calling it in
	gimp_image_mask_invalidate(). Removed gimp_image_mask_none()
	because it is the same as gimp_image_mask_clear().
	General cleanup.

	* app/core/gimpimage-mask-select.c
	* app/core/gimpimage-qmask.c: changed accordingly.

	* app/core/gimpedit.c: call gimp_image_mask_clear(), not
	gimp_channel_clear (gimp_image_get_mask()).

	* app/core/gimpimage-crop.c
	* app/core/gimpimage-resize.c
	* app/core/gimpimage-scale.c: call gimp_image_mask_changed()

	* app/gui/channels-commands.c
	* app/gui/select-commands.c
	* app/tools/gimptexttool.c
	* tools/pdbgen/pdb/channel.pdb
	* tools/pdbgen/pdb/selection.pdb: follow GimpChannel and
	gimp_image_mask* API changes.

	* app/pdb/channel_cmds.c
	* app/pdb/selection_cmds.c
	* libgimpproxy/gimpchannel.h: regenerated.

	Unrelated:

	* app/core/gimpimage.c: call gimp_drawable_push_undo() instead of
	undo_push_image() directly.