Allow tasks to depend on each other

[JonasJurczok]

Problem
Sometimes you create a task like "Build green Circuit outpost".
But to complete this you need a copper plate outpost.
The copper plate outpost in itself is a task with subtasks (walls, defences, train stations, ...).
This connection is not visible in the tasks

Describe the solution you'd like
It would be nice if you could add a "depends on" connection to other tasks.
The main list could be sorted by dependencies (you cannot sort a dependent task before the task it depends on).
Additionally you could show dependencies with some form of colour coding?

Additional context
Sorting can become complex.
Needs to analyse possible circles in the dependency graph.
What if we depend on multiple tasks or multiple tasks depend on us?

Could be visualised as extra task list in the detail screen. Above the subtasks, below the description.

What about exporting and importing?

[JonasJurczok]

@Tarrke what do you think?

[Saklad5]

I think this would be a great addition, albeit an ambitious one.

[Saklad5]

As a starting point for design, think of tasks as depending on subtasks. From there, you only need to add the ability for a task to be “under” multiple tasks at once.

This would probably require restructuring. Instead of having tasks contain subtasks, tasks would have to be treated as nodes in a directed acyclic graph.