Add optional argument to render all blocks in complete isolation

Author: jissereitsma

Util/Controller/TargetRenderer.php

@@ -18,10 +18,10 @@ public function __construct(
     ) {
     }
 
-    public function render(LayoutInterface $originalLayout, array $targetNames): array
+    public function render(LayoutInterface $originalLayout, array $targetNames, bool $isolated = false): array
     {
         $handles = $this->layoutHandlerComposite->getHandles($originalLayout->getUpdate()->getHandles());
-        $newLayout = $this->layoutLoader->load($handles);
+        $newLayout = $this->layoutLoader->load($handles, $isolated);
 
         return $this->renderBlocks($newLayout, $this->getTargetBlockNames($newLayout, $targetNames));
     }