Expanded class hierarchy of MultipleEntityFormState in Flexiform 8
- class \Drupal\Core\Form\FormStateDecoratorBase implements FormStateInterface
- class \Drupal\Core\Form\SubformState implements SubformStateInterface uses FormStateValuesTrait
- class \Drupal\flexiform\MultipleEntityFormState implements MultipleEntityFormStateInterface uses FormStateValuesTrait
- class \Drupal\Tests\Core\Form\NonAbstractFormStateDecoratorBase