Prevent deletion of user 1

#46149: Prevent account cancellation for uid 1 → changed user_multiple_cancel_confirm() which now skips user #1.

  $accounts = user_load_multiple(array_keys(array_filter($edit['accounts'])));
  foreach ($accounts as $uid => $account) {
    // Prevent user 1 from being canceled.
    if ($uid <= 1) {
      continue;
    }
    $form['accounts'][$uid] = array(
      '#type' => 'hidden',
      '#value' => $uid,
      '#prefix' => '<li>',
      '#suffix' => check_plain($account->name) . "</li>\n",
    );
  }
  // Output a notice that user 1 cannot be canceled.
  if (isset($accounts[1])) {
    $redirect = count($accounts) == 1;
    $message = t('The user account %name cannot be cancelled.', array(
      '%name' => $accounts[1]->name,
    ));
    drupal_set_message($message, $redirect ? 'error' : 'warning');

    // If only user 1 was selected, redirect to the overview.
    if ($redirect) {
      drupal_goto('admin/people');
    }
  }

This means that, from the user interface which seems the case described in this issue, it is not possible to delete the user #1, from /admin/people.

I also created a new account with the administrator role, but even with that is not possible to delete the user #1, not even visiting user/1/edit, where the Cancel account button is missing.

With other accounts, including the second administrator user, the Cancel account button is visible (and it works).

I am closing this issue as duplicate of #46149: Prevent account cancellation for uid 1 → .