Alter user VBO assign all user roles

gistfile1.php

<?php

/**
 * Views Bulk Operations doesn't respect Role Delegation's permissions in the "Modify user roles"
 * action and will offer all roles as options to add or remove from the users being edited. This form
 * alter fixed that by checking which roles the user had permissions to assign and altering the options
 * in the select element.
 *
 * This is no longer needed since I can just use the "Delegate roles" action provided by Role Delegation.
 * I didn't realise that was there!
 */

/**
 * Implements hook_form_FORM_ID_alter();
 * Only allow users to assign and remove roles they are allowed to.
 */
function tastybackend_standard_form_views_form_user_bulk_operations_page_alter(&$form, &$form_state, $form_id) {
  if (isset($form['add_roles'])) {
    global $user;
    $options = array();
    // Don't alter form for user 1 or administrators.
    if ($user->uid == '1' || in_array('administrator', $user->roles) || user_access('assign all roles')) {
      $options = $form['add_roles']['#options'];
    }
    else {
      $roles = user_roles(TRUE);
      foreach ($roles as $rid => $role) {
        // Check access to assign/remove each role determined by Role Delegation permissions.
        if (user_access('assign ' . $role . ' role')) {
          $options[$rid] = $role;
        }
      }
    }
    $form['add_roles']['#options'] = $options;
    $form['remove_roles']['#options'] = $options;
  }
}