Fix repeat on groups microsoft/vscode#27784

index.js

@@ -49,16 +49,12 @@ export default function render(tree, field, formatter) {
 }
 
 function run(nodes, formatter, fieldsRenderer) {
-	return nodes.filter(notGroup).map(node => {
+	return nodes.map(node => {
 		const outNode = formatter(new OutputNode(node, fieldsRenderer));
 		return outNode ? outNode.toString(run(node.children, formatter, fieldsRenderer)) : '';
 	}).join('');
 }
 
-function notGroup(node) {
-    return !node.isGroup;
-}
-
 /**
  * Returns fields (tab-stops) model with properly updated indices that won’t
  * collide with fields in other nodes of foprmatted tree