message: Set selection styling on children when node is expanded
diff: @@ -797,7 +797,7 @@ export class ModelSelectorWidget extends React.Component<ModelSelectorWidgetProp
  const childNodes = await this.state.treeInfo!.dataProvider.getNodes(treeItem);
  let selectedNodes: string[] = this.state.treeInfo!.selectedNodes ? [...this.state.treeInfo!.selectedNodes!] : [];
  for (const child of childNodes) {
  - selectedNodes = enable ? this._selectLabel(child) : this._deselectLabel(child);
  + selectedNodes = enable ? this._selectLabel(child, selectedNodes) : this._deselectLabel(child, selectedNodes);
  }
  this.setState({
  