[danabramov]

Yeah, we've removed a lot of code and also a lot of abstraction so the event system should be easier to follow now. We listen to events on both roots and portal containers — this is why it keeps working.

I can't speak to the exact semantics of how portals work with nested trees, but if you find an issue, please file one on our tracker. Some are expected to be impossible to solve, but hopefully we handle the common cases well.

(I would ask Dominic who worked on this but he just went on a much needed holiday break.)