bug#32850: 27.0.50; window-swap-states doesn't swap window prev/next-buffers

[martin rudalics]

> There is no need to find a window using walk-window-subtree
> when this window will be deleted anyway (if function argument
> is nil or not a live window).
>
> OTOH, a live window should not be deleted when given
> by the argument of window-state-put.

Sounds reasonable (Bug#16793 just wants a live window there and
splitting and deleting the old one should do that trivially).  Feel
free to install if you see no further problems.

martin