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

	* app/core/gimpundo.h: #define GIMP_UNDO_PREVIEW_SIZE 64

	* app/core/gimpundo.c (gimp_undo_create_preview_private):
	* app/widgets/gimpundoeditor.c (gimp_undo_editor_init): use it.