public DraggableListBuilder::validateForm(array &$form, FormStateInterface $form_state)
Form validation handler.
array $form: An associative array containing the structure of the form.
\Drupal\Core\Form\FormStateInterface $form_state: The current state of the form.
Overrides FormInterface::validateForm
public function validateForm(array &$form, FormStateInterface $form_state) { // No validation. }
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Config!Entity!DraggableListBuilder.php/function/DraggableListBuilder::validateForm/8.1.x