Re: [External] : Re: Customising display-fill-column-indicator-mode

[Eli Zaretskii]

> From: Drew Adams <drew.adams@oracle.com>
> CC: "help-gnu-emacs@gnu.org" <help-gnu-emacs@gnu.org>
> Date: Tue, 23 Aug 2022 14:30:59 +0000
> 
> Dunno whether it helps, but there is also library `fill-column-indicator.el' 
> on Emacs Wiki:
> 
> https://www.emacswiki.org/emacs/FillColumnIndicator
> 
> https://www.emacswiki.org/emacs/fill-column-indicator.el

It has known "issues", and is much slower than the built-in mode, so I
won't recommend that to anyone nowadays.  The numerous problems and
incompatibilities of that mode and its ilk were the main reason why we
developed a built-in mode, which is implemented in the display engine
in an optimal way, instead of trying to force the display from Lisp to
do stuff it wasn't supposed to do.