Super convenient if you have something on top and would like it to
be on bottom and vice versa; or to switch left and right panes.
Usually not super helpful during normal use of tmux, but very
handy when streaming, e.g. when you have a camera view obscuring
part of the top panel (or on the left/right side) and you want
to switch panel arrangement.
In the long run I would love to automate spellchecking on
the slides, but there's a long way to go, with all the
custom lingo that we use... This is just the beginning of it,
on a few files.
