fix manager assignment

src/layout.cpp

@@ -90,7 +90,7 @@ bool LayoutManager::load(const char* path)
                 node.reset(new Node());
                 break;
             }
-            node->m_manager = this;
+            node->set_manager(this);
             // try to copy the old size values
             if (old.count(id))
             {