bug#27544: 25.1; Visualization of Unicode bidirectional marks

[Eli Zaretskii]

On December 1, 2021 6:55:22 AM GMT+02:00, Lars Ingebrigtsen <larsi@gnus.org> 
wrote:
> Itai Berli <itai.berli@gmail.com> writes:
> 
> > Emacs supports 12 Unicode bidirectional marks (ALM, RLM, LRM, LRE,
> > RLE, LRO, RLO, PDF, FSI, LRI, RLI, and PDI), each of which displays as
> > a very thin space. This raises two problems.
> 
> Perhaps there should be a minor mode to display these characters more
> clearly, because they can be pretty confusing to deal with.
> 
> What would be the best way to implement such a mode?  Change
> `glyphless-char-display' buffer-locally?

Yes, I think so.