All classes that implement FormStateInterface in Drupal 8

class \Drupal\Core\Form\FormState implements FormStateInterface uses FormStateValuesTrait
class \Drupal\Core\Form\FormStateDecoratorBase implements FormStateInterface
class \Drupal\Core\Form\SubformState implements SubformStateInterface uses FormStateValuesTrait
class \Drupal\Tests\Core\Form\NonAbstractFormStateDecoratorBase
class \Drupal\authorization\Form\SubFormState implements FormStateInterface
class \Drupal\flexiform\MultipleEntityFormState implements MultipleEntityFormStateInterface uses FormStateValuesTrait
class \Drupal\markdown\BcSupport\FormStateDecoratorBase implements FormStateInterface
class \Drupal\markdown\BcSupport\SubformState implements SubformStateInterface uses FormStateValuesTrait
class \Drupal\markdown\Form\SubformState implements SubformStateInterface uses FormTrait
class \Drupal\typed_data\Form\SubformState

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