src/vs/editor/standalone/browser/standaloneServices.ts/StandaloneDialogService/doConfirm
class StandaloneDialogService:	private doConfirm(confirmation: IConfirmation): Promise<boolean> {
		let messageText = confirmation.message;
		if (confirmation.detail) {
			messageText = messageText + '\n\n' + confirmation.detail;
		}

		return Promise.resolve(window.confirm(messageText));
	}