2005-09-21  Morten Welinder  <terra@gnome.org>

	* dialog-stf-main-page.c (stf_dialog_main_page_init): Use
	go_guess_encoding.
	(main_page_set_encoding): Explicitly verify that the generated
	text is valid UTF-8.
	(encodings_changed_cb): Update preview before spinbuttons as the
	number of lines might have changed.