Fix Widget::layout for Component

widget/src/lazy/component.rs

@@ -258,8 +258,14 @@ where
         renderer: &Renderer,
         limits: &layout::Limits,
     ) -> layout::Node {
+        let t = tree.state.downcast_mut::<Rc<RefCell<Option<Tree>>>>();
+
         self.with_element(|element| {
-            element.as_widget().layout(tree, renderer, limits)
+            element.as_widget().layout(
+                &mut t.borrow_mut().as_mut().unwrap().children[0],
+                renderer,
+                limits,
+            )
         })
     }