2008-06-20  Michael Natterer  <mitch@imendio.com>

	Bug 538395 – gtk_combo_box_append_text() on non-compliant model
	segfaults

	* gtk/gtkcombobox.c (gtk_combo_box_append_text)
	(gtk_combo_box_insert_text)
	(gtk_combo_box_prepend_text)
	(gtk_combo_box_remove_text)
	(gtk_combo_box_real_get_active_text): apply patch from Christian
	Dywan which adds the needed g_return_if_fail() to prevent the
	crashes.


svn path=/trunk/; revision=20477