Issue #2890049 by megan_m, andypost, lauriii: Forum template cannot access original topics data

core/modules/forum/forum.module

@@ -522,6 +522,7 @@ function template_preprocess_forums(&$variables) {
         $table['#rows'][] = $row;
       }
 
+      $variables['topics_original'] = $variables['topics'];
       $variables['topics'] = $table;
       $variables['topics_pager'] = [
         '#type' => 'pager',

core/modules/forum/templates/forums.html.twig

@@ -8,6 +8,7 @@
  * Available variables:
  * - forums: The forums to display (as processed by forum-list.html.twig).
  * - topics: The topics to display.
+ * - topics_original: Original topics data before modification.
  * - topics_pager: The topics pager.
  * - forums_defined: A flag to indicate that the forums are configured.
  *