src/vs/workbench/contrib/tasks/common/tasks.ts/CommonTask/getCommonTaskId
class CommonTask:	public getCommonTaskId(): string {
		interface IRecentTaskKey {
			folder: string | undefined;
			id: string;
		}

		const key: IRecentTaskKey = { folder: this.getFolderId(), id: this._id };
		return JSON.stringify(key);
	}