src/vs/workbench/contrib/comments/browser/commentsTreeViewer.ts/CommentsModelVirualDelegate/getTemplateId
class CommentsModelVirualDelegate:	public getTemplateId(element: any): string {
		if (element instanceof ResourceWithCommentThreads) {
			return CommentsModelVirualDelegate.RESOURCE_ID;
		}
		if (element instanceof CommentNode) {
			return CommentsModelVirualDelegate.COMMENT_ID;
		}

		return '';
	}