如何在 remarkup 编辑器（Phabricator）中使得在表格中的文本可以换行？

<?php

final class RemarkupNewLineRule extends PhabricatorRemarkupCustomInlineRule
{
  public function getPriority() {
    return 300.0;
  }

  public function apply($text) {
        return preg_replace_callback(
        '@{newline}@m',
        array($this, 'markupNewLine'),
        $text);
  }

  public function markupNewLine($matches) {
    $engine = $this->getEngine();
    if ($engine->isTextMode()) {
      return "\n";
    }
    if ($engine->isHTMLMailMode()) {
      return phutil_safe_html('');
    }
    // Normal mode, return parsed text
    return $this->getEngine()->storeText(phutil_safe_html('<br />'));

   }
}