Long why-depends output is cut off

[piegamesde]

I have a long dependency chain, and I can't get to its start. Please allow for some arrow-key scrolling in why-depends mode.

[utdemir]

Thank you for the issue!

I just added a commit to fix this, and will cut a new release soon.

The implementation is not great, because currently you can scroll to right endlessly even when there's nothing to scroll; but at least it should make your use case possible.