2006-10-21  Michael Natterer  <mitch@gimp.org>

	Added "Edit -> Fade" which allows to modify the paint mode and
	opacity of the last drawable operation (fill, plugins etc.).
	Started from a patch by Bill Skaggs. Fixes bug #170707.

	* app/base/base-enums.[ch] (enum GimpLayerModeEffects): register
	the values REPLACE_MODE, ERASE_MODE and ANTI_ERASE_MODE with
	the type system.

	* app/widgets/gimppropwidgets.[ch]
	* app/widgets/gimpwidgets-constructors.[ch]: added "gboolean
	with_replace_modes" to the paint mode menu constructors.

	* app/tools/gimppaintoptions-gui.c
	* app/widgets/gimpbrushselect.c
	* app/widgets/gimplayertreeview.c: pass with_replace_modes = FALSE.

	* app/core/gimpdrawableundo.[ch]: added members which keep tiles,
	paint mode and opacity of the pasted pixels.

	* app/core/gimpimage-undo.[ch] (gimp_image_undo_get_fadeable):
	returns a GimpUndo suitable for a fade operation, or NULL.

	* app/core/gimp-edit.[ch] (gimp_edit_fade): implements the actual
	fade by undoing the last operation and then re-applying the pixels
	with different paint mode and opacity.

	* app/core/gimpdrawable-combine.c: store the pasted pixels in
	the GimpDrawableUndo.

	* app/actions/edit-actions.c
	* app/actions/edit-commands.[ch]: action and callback for fade.

	* app/dialogs/Makefile.am
	* app/dialogs/fade-dialog.[ch]: the fade dialog.

	* app/widgets/gimphelp-ids.h: the fade help ID.

	* menus/image-menu.xml.in: added a menu entry in "Edit".