Add option Determine progress by looking at the child tasks

[XotEmBotZ]

Currently progress is only shown if the whole project has a estimated time.
It is not practical for long term projects (which generally includes maintenance and other feature addition for specific amount of time).
In this case a time estimate for per task makes a lot of sense. Thus determine the progress by computing the progress percentage from child tasks

[davidvorkauf]

I just stumbled on this and wanted to add my two cents. I think the idea is great, but the logic is a bit tricky.

Right now we have two types of time estimates. Total for the whole project and task based estimate.

I think a good solution (at least for my usecase) would be to add together the task estimates and use this as the total project estimate and also show this as the total time estimate in the projects overview.

But what should we do if a user has already added a total estimate? And will the user be able to add a total estimate after adding estimates per task?

I don't know how others use this, but a suggestion would be that the sum of the task estimates overwrite total project estimates. So as soon as a task estimate gets added, the total estimate gets read only. After task times get removed, the project time gets editable again.