Re: minor mode for highlighting character classes such as non-ascii (bug 47455)

[Eli Zaretskii]

> Date: Tue, 1 Jun 2021 11:16:53 -0500
> From: "Roland Winkler" <winkler@gnu.org>
> 
> In the context of bug 47455 the idea emerged that it can be useful
> to have a minor mode that highlights non-ascii characters.  I want
> to ask hear for feedback: does such a mode already exist?  Can it be
> useful to have this minor mode more general such that the highlighted
> character classes become configurable?  Are there possible use cases
> for this beyond non-ascii characters?

We already highlight some potentially confusing characters, see
no-break-char-display and faces nobreak-space and nobreak-hyphen.