trait EntityUrlLanguageTrait in Open Social 10.1.x

trait EntityUrlLanguageTrait {

  /**
   * {@inheritdoc}
   */
  public function toUrl($rel = 'canonical', array $options = []) {
    $url = parent::toUrl($rel, $options);

    // If a language was requested explicitly then it's not overwritten.
    // e.g. this happens on content translations overview pages for links to the
    // specific translations.
    if (isset($options['language'])) {
      return $url;
    }
    $url_options = $url
      ->getOptions();

    // Only override the language if the parent `toUrl` method specified a
    // language. This avoids accidentally setting a language for a page that is
    // not tied to the entity's language.
    if (isset($url_options['language'])) {

      // Override the language to keep the user in the current content language.
      // By default Drupal sets the link language to the Entity's language which
      // would cause the content language for the current user to change, this
      // is undesired. Setting the language to the current content user relies
      // on the fact that Drupal displays the default language translation for
      // the entity when no translation is available but properly adjusts links.
      $url_options['language'] = $this
        ->languageManager()
        ->getCurrentLanguage(LanguageInterface::TYPE_CONTENT);
      $url
        ->setOptions($url_options);
    }
    return $url;
  }

}