When adding a node to the layer tree, ensure the initial expansion st…

…ate of the node is respected

src/core/layertree/qgslayertreenode.cpp

@@ -284,6 +284,8 @@ void QgsLayerTreeNode::insertChildrenPrivate( int index, const QList<QgsLayerTre
       node->insertChildrenPrivate( -1, orphans );
     }
 
+    // ensure initial expanded state for node is respected
+    emit expandedChanged( node, node->isExpanded() );
   }
 }