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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: minor mode for highlighting character classes such as non-ascii
 (bug 47455)
Date: Tue, 01 Jun 2021 19:31:27 +0300
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To: "Roland Winkler" <winkler@gnu.org>
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> 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.