>>>>> On Sat, 04 Dec 2021 07:43:35 +0100, Marcin Borkowski <mb...@mbork.pl> >>>>> said: Marcin> 2. We modify Emacs itself to somehow highlight the ZWS. There is (kind Marcin> of) a precedent – a no-breaking space is already fontified with Marcin> =nobreak-space= face. At the very least, make whitespace-mode somehow Marcin> show ZWSs (which it doesn't now, and I'd probably say it's a bug).
Thereʼs no need to modify Emacs: see `glyphless-char-display-control'. ZWS falls under 'format-control'. Robert --