Overrides \Drupal\views_ui\Form\Ajax\ViewsFormBase::validateForm().
Overrides ViewsFormBase::validateForm
public function validateForm(array &$form, array &$form_state) {
$form_state['handler']
->validateOptionsForm($form['options'], $form_state);
if (form_get_errors()) {
$form_state['rerender'] = TRUE;
}
}