Popup not removing theme CSS

It doesn't appear that advanced help is removing the theme CSS from the help popup, Looking at the code in the .module file:

  // Remove theme css.
  foreach ($css as $media => $types) {
    if (isset($css[$media]['theme'])) {
      $css[$media]['theme'] = array();
    }
  }

Does not remove the theme CSS, printing out the $css array, it looks like the CSS is being stored in the array differently in in drupal7 than it was in drupal6, I am creating a patch for this to properly remove the theme CSS.