Emoji flags handling seems a bit off

[unorsk]

I am not sure if this is a problem with ghostty, but I experienced this using zsh, bash and vim.

Steps to reproduce:

• Just input echo "🇨🇭🇵🇱🇩🇰" in the terminal :)

And then what I am getting is somehow unpredictable behaviour – some of the symbols disappear, until I hit "return" and it prints everything correctly.
But then when I use "up" command to get to my previous command and remove a random flag, it gets weird again – once I remove a flag in the middle, the right one renders incorrectly.

Screen.Recording.2024-12-24.at.10.06.16.mov

Screen.Recording.2024-12-24.at.10.13.38.mov

I'm running MacOS 15.1.1 (24B91)

[mitchellh]

Zsh bash and vim all do not handle grapheme clusters correctly. This is a bug with them. For more details see my blog: https://mitchellh.com/writing/grapheme-clusters-in-terminals

[peterjc]

Ah - I was hoping this was a terminal bug, e.g. WezTerm issue wezterm/wezterm#6364 which happens in Ghostty too. It makes sense that this is a problem in zsh and bash etc 😞