bug#23399: 25.0.93; follow-scroll-up not working properly

[martin rudalics]

> In GNU Emacs 25.0.93.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.29)
>   of 2016-04-27 built on pdm
>
> follow-scroll-up works the same way as scroll-up instead of scrolling to
> the bottom of the last window in the follow chain.
>
> How to reproduce the bug:
>
> - Run Emacs: emacs -Q
> - Type `C-h t' to display the tutorial.
> - Type `C-x 3' to split the window.
> - Type `M-x follow-mode RET' to switch to follow-mode.
> - Type `C-c . C-v' to invoke follow-scroll-up.
>
> The buffer is scrolled up only to the bottom of the left window (to
> "From now on, ...") instead to the bottom of the right window (to
> "\n>> Do a few C-n's ..."), which is a bug and regression from
> Emacs 24.5.

I suppose this was only a temporary regression since I cannot observe it
with any of the builds I have here.  Please try again with Emacs 25.2 or
Emacs 26.

Thanks, martin