Eli Zaretskii <eliz@gnu.org> writes:

[...]

> OK, but then this part:
>
>> +  ;; "one line" dance to update tracking and header
>> +  (image-dired-next-line)
>> +  (image-dired-previous-line))
>
> looks like a kludge.  Can't we have a cleaner code for updating the
> header data?  If image-dired-previous/next-line can update the data,
> why cannot the scroll commands do the same without calling the
> line-movement commands?

You're right.  Here is a cleaner version inspired by
`image-dired--movement-command-line'.
-- 
Manuel Giraud