bug#33871: 27.0.50; Revert Dired window saved in window configuration

[martin rudalics]

> Try to eval in emacs -Q in *scratch*:
>
> (progn (dired "/tmp") (dired-next-line 1)
>         (split-window) (other-window 1)
>         (dired "/tmp") (dired-next-line 2)
>         (let ((w-c (current-window-configuration))
>         (p-m (point-marker)))
>     (view-emacs-todo) (delete-other-windows)
>     (with-current-buffer (get-buffer "tmp")
>       (revert-buffer))
>     (set-window-configuration w-c)
>     (goto-char p-m)))
>
> Result:
> - point in the selected Dired window moves to point-min
> - point in the non-selected Dired window moves to point-max

You're obfuscating the underlying behavior with the 'dired-next-line'
and 'goto-char' calls but the final points are different without that.

Without your explicit moves, `dired' moves to the first file name in
the lower directory here.  So 'dired-move-to-filename' was called when
reverting the buffer and the 'set-window-configuration' "restores" the
lower window's point from the buffer's point because that window is
the selected one.  To confirm, try with the upper window selected
instead.

martin