Multi-dependencies
If many tasks depend on a single one, blocking task will be only displayed under one of them. True or false? Probably true - needs a test.
Changing it might be hard due to the parent-children model used by TWC. It'd have to implement kind of use multi-parent model, so a graph in fact. Maybe it's not that bad idea. For handling graphs networkx library can be used, but it provides a lot of features, which might be unnecessary for us, and it should be tested how it behaves on termux. Implementing a insertion-ordered directed graph and few algorithms (BFS) isn't rocket science after all.