Do not start tasks with uncompleted dependencies

[BarreiroT]

Tasks with dependencies should wait for their dependencies to be completed before starting. This PR completes this and adds test for this case.

[saoudrizwan]

interesting - just making the design decision here that it's okay to start a task even if its linked parent isnt finished. i want links to be super flexible (they're even bi-directional, so doesnt matter which order you link to/from, one just tugs the other). since this is a new concept, adding too many rules like this could be confusing

[saoudrizwan]

ohh i completely misunderstood the PR - this is for the 'start all tasks' button in the backlog column header?

[BarreiroT]

ohh i completely misunderstood the PR - this is for the 'start all tasks' button in the backlog column header?

Hey Saoud, that is correct. This PR ensures that whenever you start all the tasks, only those with no pending dependencies start. You can still start them manually, or once they're done, but we won't start them alltogether.