FormValidator::handleErrorsWithLimitedValidation

protected FormValidator::handleErrorsWithLimitedValidation(&$form, FormStateInterface &$form_state, $form_id)

protected function handleErrorsWithLimitedValidation(&$form, FormStateInterface &$form_state, $form_id) {
  // If validation errors are limited then remove any non validated form values,
  // so that only values that passed validation are left for submit callbacks.
  $triggering_element = $form_state->getTriggeringElement();
  if (isset($triggering_element['#limit_validation_errors']) && $triggering_element['#limit_validation_errors'] !== FALSE) {
    $values = array();
    foreach ($triggering_element['#limit_validation_errors'] as $section) {
      // If the section exists within $form_state->getValues(), even if the
      // value is NULL, copy it to $values.
      $section_exists = NULL;
      $value = NestedArray::getValue($form_state->getValues(), $section, $section_exists);
      if ($section_exists) {
        NestedArray::setValue($values, $section, $value);
      }
    }
    // A button's #value does not require validation, so for convenience we
    // allow the value of the clicked button to be retained in its normal
    // $form_state->getValues() locations, even if these locations are not
    // included in #limit_validation_errors.
    if (!empty($triggering_element['#is_button'])) {
      $button_value = $triggering_element['#value'];

      // Like all input controls, the button value may be in the location
      // dictated by #parents. If it is, copy it to $values, but do not
      // override what may already be in $values.
      $parents = $triggering_element['#parents'];
      if (!NestedArray::keyExists($values, $parents) && NestedArray::getValue($form_state->getValues(), $parents) === $button_value) {
        NestedArray::setValue($values, $parents, $button_value);
      }

      // Additionally, self::doBuildForm() places the button value in
      // $form_state->getValue(BUTTON_NAME). If it's still there, after
      // validation handlers have run, copy it to $values, but do not override
      // what may already be in $values.
      $name = $triggering_element['#name'];
      if (!isset($values[$name]) && $form_state->getValue($name) === $button_value) {
        $values[$name] = $button_value;
      }
    }
    $form_state->setValues($values);
  }
}