dired-sort-toggle-or-edit and point on first file

[Dan Jacobson]

 s runs the command dired-sort-toggle-or-edit
 Toggle between sort by date/name and refresh the dired buffer.

Nice, but when we hit it we don't stay at the top of the list, but are
sent tumbling below, cursor glued to that former (often) first file.
Yes, a feature I know, but no way offered to start afresh at top
without adding stuff to ~/.emacs.