Plugin doesn't display the text in the editor WP 4.0

  • I see the error in the logs

    [Tue Nov 11 23:22:39 2014] [error] [client ...] PHP Warning: htmlspecialchars() [<a href='function.htmlspecialchars'>function.htmlspecialchars</a>]: Invalid multibyte sequence in argument in /.../wp-includes/formatting.php on line 2936, referer: https://.../wp-admin/edit-tags.php?taxonomy=category

    If you change the function in the file /wp-includes/formatting.php
    wp_htmledit_pre

    $output = htmlspecialchars($output, ENT_NOQUOTES, get_option( 'blog_charset' ) );
    on
    $output = htmlspecialchars($output, ENT_NOQUOTES );

    and functuon wp_richedit_pre

    $output = htmlspecialchars($output, ENT_NOQUOTES, get_option( 'blog_charset' ) );

    $output = htmlspecialchars($output, ENT_NOQUOTES );

    plugin works.
    But this is a bad decision.

    https://www.ads-software.com/plugins/rich-text-tags/

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