--- /dev/null
+<?php
+
+namespace Drupal\layout_builder\Routing;
+
+use Drupal\Core\Routing\EnhancerInterface;
+use Symfony\Cmf\Component\Routing\RouteObjectInterface;
+use Symfony\Component\HttpFoundation\Request;
+
+/**
+ * Converts the query parameter for layout rebuild status to a route default.
+ *
+ * @internal
+ */
+class LayoutBuilderRouteEnhancer implements EnhancerInterface {
+
+ /**
+ * {@inheritdoc}
+ */
+ public function enhance(array $defaults, Request $request) {
+ $route = $defaults[RouteObjectInterface::ROUTE_OBJECT];
+ if ($route->hasOption('_layout_builder')) {
+ $defaults['is_rebuilding'] = (bool) $request->query->get('layout_is_rebuilding', FALSE);
+ }
+ return $defaults;
+ }
+
+}