bug#28339: 25.2; Emacs shows ZWNJ character (Zero Width non-Joiner) as Space

[Eli Zaretskii]

> From: Benjamin Riefenstahl <b.riefenstahl@turtle-trading.net>
> Cc: handa@gnu.org,  nimawebgard@gmail.com,  28339@debbugs.gnu.org
> Date: Sat, 16 Sep 2017 20:05:23 +0200
> 
> >> From: Benjamin Riefenstahl <b.riefenstahl@turtle-trading.net>
> >> I thought that with OpenType at least that depends on the font?
> 
> Eli Zaretskii writes:
> > It does, but Handa-san seems to say that even the best fonts don't
> > consider ZWNJ part of any grapheme cluster, and always leave it alone.
> 
> It breaks shaping and ligatures, so the result is not a cluster by
> definition, I think.

It could be considered a cluster with the preceding character.