public FormStateDecoratorBase::loadInclude($module, $type

public FormState::isCached() Determines

public &FormStateInterface::getGroups()

Similar to self::$build_info, but pertaining to

public FormStateDecoratorBase::isRebuilding()

public FormStateValuesTrait::isValueEmpty($key)

public FormStateDecoratorBase::setUserInput(array $us

public &FormStateInterface::getCompleteForm()

public static OptGroup::flattenOptions(array $array) Allows

public FormState::setFormState(array $form_state_additions)