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Unicode ZWJ sequence

X-seq: zsh-workers 52060
From: Alexandre ZANNI <alexandre@xxxxxxxxx>
To: <zsh-workers@xxxxxxx>
Subject: Unicode ZWJ sequence
Date: Fri, 18 Aug 2023 15:02:35 +0200
Archived-at: <https://zsh.org/workers/52060>
List-id: <zsh-workers.zsh.org>
Organization: ACCEIS

Hi,

I'm new to this newsletter, I don't know if I'm reporting this issue correctly. All I found is this email address.

TL;DR: zsh is not handling Unicode ZWJ (Zero Width Joiner) sequence.

"👩‍❤️‍👨" (that will probably not render here) is a Unicode grapheme composed of multiple code points (U+1f469 U+200d U+2764 U+fe0f U+200d U+1f468). It's basically combining some emojis together to craft a more complex one. For that the Zero Width Joiner ‍(U+200D) and the Variation Selector-16 (U+FE0F) are used. But instead of displaying one grapheme, zsh is displaying each individual code point.

As you can see below the terminal emulator named foot is capable of displaying such a grapheme, and other command line shell like bash or fish are capable of it too, only zsh can't.

Using zsh 5.9.

Is this problem already known?

Regards,

Alexandre ZANNI

Expert en cybersécurité

M: +33 7 67 96 14 62

www.acceis.fr

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Follow-Ups:
- Re: Unicode ZWJ sequence
  - From: Roman Perepelitsa
- Re: Unicode ZWJ sequence
  - From: Mikael Magnusson

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