isRunning property
Whether the body is running or its children are still finishing.
Still true while the core cleans up after the body: the outcome
is decided by then, but the job has not finished. For a branch of
JobContext.runAll not even that much — a branch is held until the
group decides, and until then its outcome is not settled at all.
Implementation
@override
bool get isRunning => _status == JobStatus.running;