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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: minor mode for highlighting character classes such as non-ascii
 (bug 47455)
Date: Tue, 01 Jun 2021 20:39:49 +0300
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To: "Roland Winkler" <winkler@gnu.org>
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> Date: Tue, 1 Jun 2021 12:34:56 -0500
> From: "Roland Winkler" <winkler@gnu.org>
> Cc: emacs-devel@gnu.org, Eli Zaretskii <eliz@gnu.org>
> 
> Personally, I have been fooled in particular by unicode 'ZERO WIDTH
> SPACE' which probably requires special treatment.  Could it also
> make sense to give this particular character a (possibly configurable)
> treatment by the display engine?

It already does, see glyphless-char-display.  You can customize it to
your needs.