Eli Zaretskii <eliz@gnu.org> writes:

>> In other words, the window slowly scrolls up, moving the point to the
>> top, but then quickly resets back to how it looked like before the
>> scroll started.
>
> No, it does not, at least not on my system.  There's a small vscroll
> (you should see it if you move the cursor vertically with C-p after
> eval-buffer returns).  So the code works, it just yields a vscroll
> that is not what you expect for some reason (and in about 50% of my
> attempts -- in the rest the code works as you expect).

See the attached screencast on what I am seeing.