This also changes the structure of the follow state back to be per-pane. This
is because we can't share the same view state across different panes for
a couple of reasons:
- Rendering the same view in N different panes is almost always not something
that we want due to global state such as focus.
- If we allowed it and a user followed the same person in two different panes,
there would be no way of unfollowing in one pane without also unfollowing in
the other.
Antonio Scandurra
a154e4500b