src/vs/workbench/contrib/notebook/browser/view/cellParts/cellComments.ts/CellComments/_getCommentThreadForCell
class CellComments:	private async _getCommentThreadForCell(element: ICellViewModel): Promise<{ thread: languages.CommentThread<ICellRange>; owner: string } | null> {
		if (this.notebookEditor.hasModel()) {
			const commentInfos = coalesce(await this.commentService.getNotebookComments(element.uri));
			if (commentInfos.length && commentInfos[0].threads.length) {
				return { owner: commentInfos[0].owner, thread: commentInfos[0].threads[0] };
			}
		}

		return null;
	}