Better indication of final-incomplete tasks

[oliver-sanders]

Tasks in a final status (succeeded, failed, submit-failed or expired) that have not completed their completion expression indicate a failure in the workflow. Tasks in these states require human intervention to recover.

Currently, we do not provide any form of visual indication of a final-incomplete task in the GUI/Tui which is a problem.

• We do issue warnings about these tasks which will show up in the warning triangles.
• The info view will also show the completion expression as incomplete.
• However, there is no top-level indication on the task itself.
• Note a final-incomplete task could have a task state of succeeded!

We need a better way of indicating final-incomplete tasks to users.

• Users should be able to see these tasks prominently.
• Users should be able to tell if there are any in the workflow (e.g. by filtering them).
• Users should be able to easily select these tasks to perform operations on them.

An attractive option to achieving this is to swap succeeded/failed for complete/incomplete. Amusingly, this is how the task-job separation was originally proposed. However, there are many details that would need to be fleshed out, e.g. cylc trigger //*:failed, task state filtering (might need job-state filter controls in the GUI?), etc.

May require a cylc-admin proposal.

See also - cylc/cylc-flow#4957

[hjoliver]

It is very important to make final-incomplete tasks stand out.

The "attractive solution" - which I agree is attractive - may be some time coming because of potential implications.

So I think we need a quick interim solution, such as banging an ❗or ❌ badge on them, in the GUI.