Resolve #3293558 "Workspaces support"

Closes #3293558

src/Form/RevisionOverviewForm.php

@@ -19,6 +19,7 @@ use Drupal\Core\Session\AccountInterface;
 use Drupal\Core\Url;
 use Drupal\diff\DiffEntityComparison;
 use Drupal\diff\DiffLayoutManager;
+use Drupal\node\NodeInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 
 /**
@@ -78,20 +79,7 @@ class RevisionOverviewForm extends FormBase {
     $node_storage = $this->entityTypeManager->getStorage('node');
     $type = $node->getType();
 
-    $pagerLimit = $this->config->get('general_settings.revision_pager_limit');
-
-    $query = $this->entityTypeManager->getStorage('node')->getQuery()
-      ->condition($node->getEntityType()->getKey('id'), $node->id())
-      ->pager($pagerLimit)
-      ->allRevisions()
-      ->sort($node->getEntityType()->getKey('revision'), 'DESC')
-      // Access to the content has already been verified. Disable query-level
-      // access checking so that revisions for unpublished content still
-      // appear.
-      ->accessCheck(FALSE)
-      ->execute();
-    $vids = \array_keys($query);
-
+    $vids = $this->getRevisionIds($node);
     $revision_count = \count($vids);
 
     $build['#title'] = $has_translations ? $this->t('@langname revisions for %title', [
@@ -250,6 +238,7 @@ class RevisionOverviewForm extends FormBase {
       '#type' => 'pager',
     ];
     $build['#attached']['library'][] = 'node/drupal.node.admin';
+    $form_state->set('workspace_safe', TRUE);
     return $build;
   }
 
@@ -258,9 +247,9 @@ class RevisionOverviewForm extends FormBase {
    *
    * @param string $name
    *   Name attribute.
-   * @param string $return_val
+   * @param int $return_val
    *   Return value attribute.
-   * @param string $default_val
+   * @param int|false $default_val
    *   Default value attribute.
    *
    * @return array
@@ -276,6 +265,29 @@ class RevisionOverviewForm extends FormBase {
     ];
   }
 
+  /**
+   * Gets all the revision IDs for the given node.
+   *
+   * @param \Drupal\node\NodeInterface $node
+   *   The node entity.
+   *
+   * @return int[]
+   *   The revision IDs.
+   */
+  protected function getRevisionIds(NodeInterface $node): array {
+    $result = $this->entityTypeManager->getStorage('node')->getQuery()
+      ->condition($node->getEntityType()->getKey('id'), $node->id())
+      ->pager($this->config->get('general_settings.revision_pager_limit'))
+      ->allRevisions()
+      ->sort($node->getEntityType()->getKey('revision'), 'DESC')
+      // Access to the content has already been verified. Disable query-level
+      // access checking so that revisions for unpublished content still
+      // appear.
+      ->accessCheck(FALSE)
+      ->execute();
+    return \array_keys($result);
+  }
+
   /**
    * Set and return configuration for revision.
    *