in comparisions with GTK_TYPE_STRING, use the fundamental type to catch

in comparisions with GTK_TYPE_STRING, use the fundamental type to catch

Wed Jan 13 20:14:32 1999  Tim Janik  <timj@gtk.org>

        * gtk/gtkarg.c (gtk_arg_copy): in comparisions with GTK_TYPE_STRING, use
        the fundamental type to catch GTK_TYPE_IDENTIFIER as well.

        * gtk/gtkmenushell.c:
        (gtk_real_menu_shell_activate_current):
        (gtk_menu_shell_button_release): asure that we only activate sensitive
        menu items, reported by Dave Cole <dave@dccs.com.au>.