2003-10-08  Michael Natterer  <mitch@gimp.org>

	* app/core/gimp-edit.c (gimp_edit_fill_internal): new utility
	function which does everything gimp_edit_clear() and
	gimp_edit_fill() do but doesn't fail to:

	- fill an indexed drawable with white.
	- fill a drawable with alpha with transparency.

	(gimp_edit_clear)
	(gimp_edit_fill): use gimp_edit_fill_internal().

	* app/core/gimpdrawable.c (gimp_drawable_[apply,replace]_region):
	added more g_return_if_fail(required_parameter != NULL).