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diff --git a/web/modules/contrib/entity/src/Controller/RevisionOverviewController.php b/web/modules/contrib/entity/src/Controller/RevisionOverviewController.php
new file mode 100644
index 000000000..495b6a040
--- /dev/null
+++ b/web/modules/contrib/entity/src/Controller/RevisionOverviewController.php
@@ -0,0 +1,160 @@
+<?php
+
+namespace Drupal\entity\Controller;
+
+use Drupal\Component\Utility\Xss;
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Datetime\DateFormatterInterface;
+use Drupal\Core\Entity\ContentEntityInterface;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Render\RendererInterface;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Entity\RevisionLogInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a controller which shows the revision history.
+ *
+ * This controller leverages the revision controller trait, which is agnostic to
+ * any entity type, by using \Drupal\Core\Entity\RevisionLogInterface.
+ */
+class RevisionOverviewController extends ControllerBase {
+
+  use RevisionControllerTrait;
+
+  /**
+   * The date formatter.
+   *
+   * @var \Drupal\Core\Datetime\DateFormatterInterface
+   */
+  protected $dateFormatter;
+
+  /**
+   * The renderer.
+   *
+   * @var \Drupal\Core\Render\RendererInterface
+   */
+  protected $renderer;
+
+  /**
+   * Creates a new RevisionOverviewController instance.
+   *
+   * @param \Drupal\Core\Datetime\DateFormatterInterface $date_formatter
+   *   The date formatter.
+   */
+  public function __construct(DateFormatterInterface $date_formatter, RendererInterface $renderer) {
+    $this->dateFormatter = $date_formatter;
+    $this->renderer = $renderer;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static($container->get('date.formatter'), $container->get('renderer'));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function hasDeleteRevisionAccess(EntityInterface $entity) {
+    return $this->currentUser()->hasPermission("delete all {$entity->id()} revisions");
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function buildRevertRevisionLink(EntityInterface $entity_revision) {
+    if ($entity_revision->hasLinkTemplate('revision-revert-form')) {
+      return [
+        'title' => t('Revert'),
+        'url' => $entity_revision->toUrl('revision-revert-form'),
+      ];
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function buildDeleteRevisionLink(EntityInterface $entity_revision) {
+    if ($entity_revision->hasLinkTemplate('revision-delete-form')) {
+      return [
+        'title' => t('Delete'),
+        'url' => $entity_revision->toUrl('revision-delete-form'),
+      ];
+    }
+  }
+
+  /**
+   * Generates an overview table of older revisions of an entity.
+   *
+   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+   *   The route match.
+   *
+   * @return array
+   *   A render array.
+   */
+  public function revisionOverviewController(RouteMatchInterface $route_match) {
+    return $this->revisionOverview($route_match->getParameter($route_match->getRouteObject()->getOption('entity_type_id')));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function getRevisionDescription(ContentEntityInterface $revision, $is_default = FALSE) {
+    /** @var \Drupal\Core\Entity\ContentEntityInterface|\Drupal\user\EntityOwnerInterface|\Drupal\Core\Entity\RevisionLogInterface $revision */
+    if ($revision instanceof RevisionLogInterface) {
+      // Use revision link to link to revisions that are not active.
+      $date = $this->dateFormatter->format($revision->getRevisionCreationTime(), 'short');
+      $link = $revision->toLink($date, 'revision');
+
+      // @todo: Simplify this when https://www.drupal.org/node/2334319 lands.
+      $username = [
+        '#theme' => 'username',
+        '#account' => $revision->getRevisionUser(),
+      ];
+      $username = $this->renderer->render($username);
+    }
+    else {
+      $link = $revision->toLink($revision->label(), 'revision');
+      $username = '';
+
+    }
+
+    $markup = '';
+    if ($revision instanceof RevisionLogInterface) {
+      $markup = $revision->getRevisionLogMessage();
+    }
+
+    if ($username) {
+      $template = '{% trans %}{{ date }} by {{ username }}{% endtrans %}{% if message %}<p class="revision-log">{{ message }}</p>{% endif %}';
+    }
+    else {
+      $template = '{% trans %} {{ date }} {% endtrans %}{% if message %}<p class="revision-log">{{ message }}</p>{% endif %}';
+    }
+
+    $column = [
+      'data' => [
+        '#type' => 'inline_template',
+        '#template' => $template,
+        '#context' => [
+          'date' => $link->toString(),
+          'username' => $username,
+          'message' => ['#markup' => $markup, '#allowed_tags' => Xss::getHtmlTagList()],
+        ],
+      ],
+    ];
+    return $column;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function hasRevertRevisionAccess(EntityInterface $entity) {
+    return AccessResult::allowedIfHasPermission($this->currentUser(), "revert all {$entity->getEntityTypeId()} revisions")->orIf(
+      AccessResult::allowedIfHasPermission($this->currentUser(), "revert {$entity->bundle()} {$entity->getEntityTypeId()} revisions")
+    );
+  }
+
+}