Re: follow-mode: extremely slow in combination with org-mode

[Eli Zaretskii]

> Date: Sun, 17 Jun 2018 11:13:33 +0000
> From: Alan Mackenzie <address@hidden>
> Cc: Gerald Wildgruber <address@hidden>, address@hidden
> 
>     commit c93b886f957b55df4fe45d986c34242832ec4a28
>     Author: Chong Yidong <address@hidden>
>     Date:   Sun Apr 29 09:48:23 2012 +0800
> 
>         Fix Follow mode's calculation of window ends.
> 
>         * lisp/follow.el (follow-calc-win-end): Rewrite to handle partial
>         screen lines correctly.
>         (follow-avoid-tail-recenter): Minor cleanup.
> 
>         Fixes: debbugs:8390

Btw, bug#8390 is back.  My testing indicates that it was fixed in
Emacs 24.3 (I guess by the above change), and then became broken again
in Emacs 24.4.  Try "C-x C--" in a buffer under follow-mode, and you
will see the erratic behavior.