Resolve #3431586 "D11"

Closes #3431586

src/Render/MainContent/IframeRenderer.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Drupal\layout_builder_iframe_modal\Render\MainContent;
 
+use Drupal\Component\Utility\DeprecationHelper;
 use Drupal\Core\Ajax\AjaxResponse;
 use Drupal\layout_builder_iframe_modal\Ajax\OpenIframeCommand;
 use Drupal\Core\Routing\RouteMatchInterface;
@@ -60,7 +61,12 @@ class IframeRenderer extends DialogRenderer {
     $title = isset($main_content['#title']) ? $main_content['#title'] : $this->titleResolver->getTitle($request, $route_match->getRouteObject());
 
     if (is_array($title)) {
-      $title = $this->renderer->renderPlain($title);
+      $title = DeprecationHelper::backwardsCompatibleCall(
+        currentVersion: \Drupal::VERSION,
+        deprecatedVersion: '10.3',
+        currentCallable: fn() => $this->renderer->renderInIsolation($title),
+        deprecatedCallable: fn() => $this->renderer->renderPlain($title),
+      );
     }
 
     $options = $request->request->all('dialogOptions');