bug#32790: 27.0.50; point jumps unexpectedly after delete-window

[martin rudalics]

> Could you add aliases for 'up' and 'down' in window-in-direction?
> Then we won't need such special handling in windmove.el:
>
>    (window-in-direction
>     (cond
>      ((eq dir 'up) 'above)
>      ((eq dir 'down) 'below)
>      (t dir))
>     window nil arg windmove-wrap-around t)

Should be done now on master.  Please test.

martin