treeData mode drag sample code isSelectionParentOfTarget method improvement

[netnr]

https://ag-grid.com/javascript-data-grid/row-dragging/#example-highlighted-tree-data

function isSelectionParentOfTarget(selectedNode, targetNode) {
  var children = selectedNode.childrenAfterGroup || [];
  for (var i = 0; i < children.length; i++) {
    if (targetNode && children[i].key === targetNode.key) return true;
    isSelectionParentOfTarget(children[i], targetNode);
  }
  return false;
}

↓

function isSelectionParentOfTarget(selectedNode, targetNode) {
    // check targetNode!=null

    if (selectedNode.id === targetNode.id) {
        return true;
    }

    let children = selectedNode.childrenAfterGroup || [];
    for (let i = 0; i < children.length; i++) {
        let result = isSelectionParentOfTarget(children[i], targetNode);
        if (result) {
            return true;
        }
    }

    return false;
}