/**
  * {@inheritdoc}
  */
 public function submitForm(array &$form, FormStateInterface $form_state)
 {
     // Allow the display variant to submit the form.
     $display_variant_values = (new FormState())->setValues($form_state->getValue('display_variant'));
     $this->displayVariant->submitConfigurationForm($form, $display_variant_values);
     // Update the original form values.
     $form_state->setValue('display_variant', $display_variant_values->getValues());
 }