Limit the options of the Autocomplete field breaks behavior for (cck) fields

The commit a6f25c0 breaks autocomplete filters for fields.

$handler->field == $this->field ignores the fact that the fields may be called ie. field_name_value or field_name_email, where if ($handler->field == $this->field) won't match.

I guess it also needs a fix in views_autocomplete_filter():

$filters = $display_handler->get_option('filters');
if (empty($filters[$filter_name]['exposed']) || empty($filters[$filter_name]['expose']['autocomplete_filter'])) {
  return drupal_not_found();
}