src/vs/workbench/contrib/comments/browser/commentThreadWidget.ts/ReviewZoneWidget/createThreadLabel
class ReviewZoneWidget:	private createThreadLabel() {
		let label: string | undefined;
		label = this._commentThread.label;

		if (label === undefined) {
			if (!(this._commentThread.comments && this._commentThread.comments.length)) {
				label = nls.localize('startThread', "Start discussion");
			}
		}

		if (label) {
			this._headingLabel.textContent = strings.escape(label);
			this._headingLabel.setAttribute('aria-label', label);
		}
	}