Make builtin icons work in gtk_window_set_icon_name() (#321046, Maxim

Make builtin icons work in gtk_window_set_icon_name() (#321046, Maxim

2005-11-12  Matthias Clasen  <mclasen@redhat.com>

	Make builtin icons work in gtk_window_set_icon_name()
	(#321046, Maxim Udushlivy)

	* gtk/gtkicontheme.c (insert_theme): Always insert the default
	theme.
	(ensure_valid_themes): Call _gtk_icon_theme_ensure_builtin_cache()
	from here.
	(theme_lookup_icon, find_builtin_icon): ...and not from here.
	(gtk_icon_theme_lookup_icon): Remove an unncessary assert.
	(gtk_icon_theme_get_icon_sizes): Also check builtin icons.