Dropdownlijst in post of page laat niet alle gebruikers zien

Een bug; gelukkig schreef iemand deze code, die direct werkte!
http://wordpress.stackexchange.com/questions/91862/users-with-custom-roles-not-showing-in-post-author-select-box

  // Filter to fix the Post Author Dropdown  function author_override( $output ) {      global $post, $user_ID;        // return if this isn't the theme author override dropdown      if (!preg_match('/post_author_override/', $output)) return $output;        // return if we've already replaced the list (end recursion)      if (preg_match ('/post_author_override_replaced/', $output)) return $output;        // replacement call to wp_dropdown_users        $output = wp_dropdown_users(array(          'echo' => 0,          'name' => 'post_author_override_replaced',          'selected' => empty($post->ID) ? $user_ID : $post->post_author,          'include_selected' => true        ));          // put the original name back        $output = preg_replace('/post_author_override_replaced/', 'post_author_override', $output);        return $output;  }  add_filter('wp_dropdown_users', 'author_override');