Emojis are causing width issues in the prompt

[matrinox]

See the video below for what happens when you display an emoji using emojify on the prompt. The first part uses emojify :smile: and the second part uses echo :); everything else remains constant.

Any ideas?

[jmurowaniecki]

Multibyte/double-width issue (fixed on zsh, fish and some others… But no signal to be fixed on bash/sh).

[matrinox]

@jmurowaniecki is it a technical reason why it isn't fixed on bash/sh?