Error messages don't appear when creating/editing custom breadcrumbs

On line 166, the custom_breadcrumbs_form_validate function appears, and it throws an error when you don't have the same number of entries in the "titles" box as the "paths" box. However, the code for form_set_error is incorrect, and so the error is never displayed; it simply refreshes the edit screen and no new breadcrumb (or edited breadcrumb) is created. form_set_error requires that the first argument be the actual form field the error relates to (so Drupal knows which one to outline in red).

Solution is in the attached patch. The manual version is to cut the function starting at line 166:

function custom_breadcrumbs_form_validate($form_id, $form_values) {
  $path_count = count(explode("\n", $form_values['paths']));
  $title_count = count(explode("\n", $form_values['titles']));
  if ($title_count != $path_count) {
    form_set_error(t('Every link path must have a matching title. There are !paths paths, and !titles titles.', array('!paths' => $path_count, '!titles' => $title_count)));
  }
}

and replace it with:

function custom_breadcrumbs_form_validate($form_id, $form_values) {
  $path_count = count(explode("\n", $form_values['paths']));
  $title_count = count(explode("\n", $form_values['titles']));
  if ($title_count != $path_count) {
    $error_field = ($title_count > $path_count) ? 'paths' : 'titles';
    form_set_error($error_field,t('Every link path must have a matching title. There are !paths paths, and !titles titles.', array('!paths' => $path_count, '!titles' => $title_count)));
  }
}

Problem solved. As you can see, it decides which field to outline in red by deciding which of the two textareas has fewer lines entered. That one gets the "error" designation. Enjoy!