public function form(array $form, FormStateInterface $form_state) {
$user = $this->currentUser();
/** @var \Drupal\user\UserInterface $account */
$account = $this->entity;
$admin = $user->hasPermission('administer users');
// Pass access information to the submit handler. Running an access check
// inside the submit function interferes with form processing and breaks
// hook_form_alter().
$form['administer_users'] = [
'#type' => 'value',
'#value' => $admin,
];

$form['#attached']['library'][] = 'core/drupal.form';

// For non-admin users, populate the form fields using data from the
// browser.
if (!$admin) {
$form['#attributes']['data-user-info-from-browser'] = TRUE;
}

// Because the user status has security implications, users are blocked by
// default when created programmatically and need to be actively activated
// if needed. When administrators create users from the user interface,
// however, we assume that they should be created as activated by default.
if ($admin) {
$account->activate();
}

// Start with the default user account fields.
$form = parent::form($form, $form_state, $account);

return $form;
}

public function renderRoot(&$elements) {
// Disallow calling ::renderRoot() from within another ::renderRoot() call.
if ($this->isRenderingRoot) {
$this->isRenderingRoot = FALSE;
throw new \LogicException('A stray renderRoot() invocation is causing bubbling of attached assets to break.');
}

// Render in its own render context.
$this->isRenderingRoot = TRUE;
$output = $this->executeInRenderContext(new RenderContext(), function () use (&$elements) {
return $this->render($elements, TRUE);
});
$this->isRenderingRoot = FALSE;

return $output;
}

public function render(&$elements, $is_root_call = FALSE) {
// Since #pre_render, #post_render, #lazy_builder callbacks and theme
// functions or templates may be used for generating a render array's
// content, and we might be rendering the main content for the page, it is
// possible that any of them throw an exception that will cause a different
// page to be rendered (e.g. throwing
// \Symfony\Component\HttpKernel\Exception\NotFoundHttpException will cause
// the 404 page to be rendered). That page might also use
// Renderer::renderRoot() but if exceptions aren't caught here, it will be
// impossible to call Renderer::renderRoot() again.
// Hence, catch all exceptions, reset the isRenderingRoot property and
// re-throw exceptions.
try {
return $this->doRender($elements, $is_root_call);
}
catch (\Exception $e) {
// Mark the ::rootRender() call finished due to this exception & re-throw.
$this->isRenderingRoot = FALSE;
throw $e;
}
}