2003-11-25  Michael Natterer  <mitch@gimp.org>

	* app/core/core-enums.[ch]: added GIMP_UNDO_EVENT_UNDO_FREEZE
	and GIMP_UNDO_EVENT_UNDO_THAW.

	* app/core/gimpimage.c: emit undo events in
	gimp_image_undo_freeze() and gimp_image_undo_thaw().

	* app/widgets/gimpundoeditor.c: made it aware of FREEZE/THAW signals
	and robust against evil stuff like freezing/thawing the undo
	in the middle of an open undo group. Fixes bug #124421.

	* plug-ins/script-fu/scripts/circuit.scm: push and undo group
	instead of disabling/enabling undo.