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


From: Nima Aryan
Subject: bug#28339: 25.2; Emacs shows ZWNJ character (Zero Width non-Joiner) as Space
Date: Sat, 16 Sep 2017 04:05:15 +0000

If Unicode does not have a rule of ZWNJ handing, to delete ZWNJ, how a user know which to type; C-d or BS? And while doing cut&paste repeatedly, are there any chance of having the second and third lines of the attached file? They have two and three consecutive ZWNJ. How does a user notice such a (perhaps incorrect) situation?

As a user, I’ve been in this situation before and it simply doesn’t have any effect on the user and the user simply can’t figure it out (unless represent ZWNJ as something else). This is why ZWNJ-as-Thin is a workaround hack and not a solution. ZWNJ takes no space it’s like 3x0=0. To delete, some editors like Gedit and many more simply take any number of consequent ZWNJs as one. I’ve seen some which count each ZWNJ and the user have to delete each to reach the character before.

On Sat, Sep 16, 2017 at 6:03 AM handa address@hidden wrote:

In article <address@hidden>, Eli Zaretskii <address@hidden> writes:

> > Each Arabic character constitutes a grapheme cluster.  Then, for the
> > sequence "0646 0645 06CC 200C 0634 0648 062F", to which neighboring should
> > 200C belongs to?  Does Unicode define it?

> I don't think Unicode defines that, but I thought the shaping engine
> gives us back glyphs that don't include ZWNJ itself.  Evidently,
> that's not true, which I find strange.

If ZWNJ is WITHIN a grapheme cluster (i.e. not at the edges
of the cluster), the m17n lib does not return ZWNJ glyph.

> > Anyway, is it convenient or inconvenient to be able to edit ZWNJ directly?

> It's convenient.  But we already support deletion of composed
> characters, so I didn't think it mattered.

If Unicode does not have a rule of ZWNJ handing, to delete ZWNJ, how a
user know which to type; C-d or BS?  And while doing cut&paste
repeatedly, are there any chance of having the second and third lines of
the attached file?  They have two and three consecutive ZWNJ.  How does
a user notice such a (perhaps incorrect) situation?

---
K. Handa
address@hidden


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