How to 'revert' revision into 'draft' state

+1

FYI I was able to override this the core revert forms to enforce draft on new revisions by:

1. Copying and renaming the "node.revision_revert_confirm" and "node.revision_revert_translation_confirm" routes from core's node.routing.yml to "MY_MODULE.node.revision_revert_confirm" and "MY_MODULE.node.revision_revert_translation_confirm"
2. Creating a new file to extend the first class from the routes above here: /web/modules/custom/MY_MODULE/src/Form/NodeRevisionRevertForm.php
3. Creating a new file to extend the second class from the routes above here: /web/modules/custom/MY_MODULE/src/Form/NodeRevisionRevertTranslationForm.php
4. Overriding the route with the above new classes here: /web/modules/custom/MY_MODULE/src/Routing/RouteSubscriber.php
5. Clearing caches

NodeRevisionArchiveForm.php:

<?php

namespace Drupal\MY_MODULE\Form;

use Drupal\Core\Form\FormStateInterface;
use Drupal\node\NodeInterface;
use Drupal\node\Form\NodeRevisionRevertForm as NodeRevisionRevertCoreForm;

/**
 * Provides a form for reverting a node revision.
 *
 * @internal
 */
class NodeRevisionRevertForm extends NodeRevisionRevertCoreForm {

  /**
   * Prepares a revision to be reverted.
   *
   * @param \Drupal\node\NodeInterface $revision
   *   The revision to be reverted.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   *
   * @return \Drupal\node\NodeInterface
   *   The prepared revision ready to be stored.
   */
  protected function prepareRevertedRevision(NodeInterface $revision, FormStateInterface $form_state) {
    $revision = $this->enforceModerationState($revision, $form_state);
    return parent::prepareRevertedRevision($revision, $form_state);
  }

  /**
   * Enforce moderation state for a revision.
   *
   * @param \Drupal\node\NodeInterface $revision
   *   The revision to be reverted.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   * @param string $state
   *   The moderation state to enforce.
   *
   * @return \Drupal\node\NodeInterface
   *   The prepared revision ready to be stored.
   */
  public function enforceModerationState(NodeInterface $revision, FormStateInterface $form_state, string $state = 'draft'): NodeInterface {
    if ($revision->hasField('moderation_state')) {
      $revision->set('moderation_state', $state);
    }
    return $revision;
  }

}

NodeRevisionRevertTranslationForm.php:

<?php

namespace Drupal\MY_MODULE\Form;

use Drupal\Core\Form\FormStateInterface;
use Drupal\node\NodeInterface;
use Drupal\node\Form\NodeRevisionRevertTranslationForm as NodeRevisionRevertTranslationCoreForm;

/**
 * Provides a form for reverting a node revision for a single translation.
 *
 * @internal
 */
class NodeRevisionRevertTranslationForm extends NodeRevisionRevertTranslationCoreForm {

  /**
   * {@inheritdoc}
   */
  protected function prepareRevertedRevision(NodeInterface $revision, FormStateInterface $form_state) {
    $revision = $this->enforceModerationState($revision, $form_state);
    return parent::prepareRevertedRevision($revision, $form_state);
  }

  /**
   * Enforce moderation state for a revision.
   *
   * @param \Drupal\node\NodeInterface $revision
   *   The revision to be reverted.
   * @param \Drupal\Core\Form\FormStateInterface $form_state
   *   The current state of the form.
   * @param string $state
   *   The moderation state to enforce.
   *
   * @return \Drupal\node\NodeInterface
   *   The prepared revision ready to be stored.
   */
  public function enforceModerationState(NodeInterface $revision, FormStateInterface $form_state, string $state = 'draft'): NodeInterface {
    if ($revision->hasField('moderation_state')) {
      $revision->set('moderation_state', $state);
    }
    return $revision;
  }

}

RouteSubscriber.php:

<?php

namespace Drupal\MY_MODULE\Routing;

use Drupal\Core\Routing\RouteSubscriberBase;
use Symfony\Component\Routing\RouteCollection;

/**
 * Route subscriber to subscribe to route event.
 */
class RouteSubscriber extends RouteSubscriberBase {

  /**
   * {@inheritDoc}
   */
  protected function alterRoutes(RouteCollection $collection) {
    // Altering the node revert form.
    if ($route = $collection->get('node.revision_revert_confirm')) {
      $route->setDefault('_form', '\Drupal\MY_MODULE\Form\NodeRevisionRevertForm');
    }

    // Altering the node translation revert form.
    if ($route = $collection->get('node.revision_revert_translation_confirm')) {
      $route->setDefault('_form', '\Drupal\MY_MODULE\Form\NodeRevisionRevertTranslationForm');
    }
  }

}