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

[Drew Adams]

> > Dunno whether it helps, but there is also library `fill-column-
> > indicator.el' on Emacs Wiki:
> 
> 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.

Good to know; thx.

Someone (TM) might want to update the wiki
page with such info.  (Anyone can do so.)

https://www.emacswiki.org/emacs/FillColumnIndicator