is_pl_win? (Xmms::Remote)

    /*
     * Get the visibility of the playlist window.
     *
     * This method raises an Xmms::Error exception if XMMS is not running.
     *
     * Examples:
     *   puts 'playlist window visible' if remote.playlist_visible?
     *   puts 'playlist window visible' if remote.pl_visible?
     *   puts 'playlist window visible' if remote.playlist?
     *   puts 'playlist window visible' if remote.pl?
     *
     */
    static VALUE xr_is_pl(VALUE self) {