Handle the case where the to-be-inserted string is a substring of the

Handle the case where the to-be-inserted string is a substring of the

2003-11-05  Morten Welinder  <terra@gnome.org>

	* glib/gstring.c (g_string_insert_len): Handle the case where the
	to-be-inserted string is a substring of the target string.
	(g_string_assign): Handle "s = s;".
	(#114260, self.)