FilterFormatAddForm.php

<?php

namespace Drupal\filter;

use Drupal\Core\Form\FormStateInterface;

/**
 * Provides a form for adding a filter format.
 *
 * @internal
 */
class FilterFormatAddForm extends FilterFormatFormBase {
    
    /**
     * {@inheritdoc}
     */
    public function form(array $form, FormStateInterface $form_state) {
        return parent::form($form, $form_state);
    }
    
    /**
     * {@inheritdoc}
     */
    public function submitForm(array &$form, FormStateInterface $form_state) {
        parent::submitForm($form, $form_state);
        $this->messenger()
            ->addStatus($this->t('Added text format %format.', [
            '%format' => $this->entity
                ->label(),
        ]));
        $form_state->setRedirect('filter.admin_overview');
        return $this->entity;
    }

}