src/vs/workbench/contrib/notebook/browser/view/output/transforms/richTransform.ts/StderrRendererContrib/render
class StderrRendererContrib:	override render(output: ICellOutputViewModel, item: IOutputItemDto, container: HTMLElement, notebookUri: URI): IRenderOutput {
		const result = super.render(output, item, container, notebookUri);
		container.classList.add('error');
		return result;
	}