add debug GUI render mode (F8)

src/graphics/ui/elements/UINode.cpp

@@ -266,7 +266,7 @@ void UINode::moveInto(
 ) {
     auto parent = node->getParent();
     if (auto container = dynamic_cast<Container*>(parent)) {
-        container->remove(node);
+        container->remove(node.get());
     }
     if (parent) {
         parent->scrolled(0);