drupal_is_front_page fails if front page is aliased

With Drupal 4.7.3 drupal_is_front() will always return false if the desired frontpage has an aliased path. If a user creates a page to be used as the front page and give is the path alias of "frontpage" and then on admin/settings enters "frontpage" as the Default front page, the page will become the front page, but the theme variable $is_front will always return false.

This is because drupal compares "site_frontpage" variable directly to the non-drupal aliased $get['q]' path in drupal_is_front_page(). In this case, it checks to see if "frontpage" is the same as "node/x" and returns false.

This could be fixed changing drupal_is_front_page() to run the site_frontpage variable through drupal_get_normal_path(), on line 200 of path.inc like:

  return $_GET['q'] == drupal_get_normal_path(variable_get('site_frontpage', 'node'));