Emoji in PROMPT is causing character duplication after pressing TAB

• I am on the latest Hyper.app version
• I have searched the issues of this repo and believe that this is not a duplicate

• OS version and name: macOS Mojave 10.14.3 (18D109)
• Hyper.app version: 2.1.2 (stable)
• Link of a Gist with the contents of your .hyper.js: https://gist.github.com/jkulak/1633a8c0572aade642f050be97b1da76
• Relevant information from devtools (CMD+ALT+I on macOS, CTRL+SHIFT+I elsewhere):
• The issue is reproducible in vanilla Hyper.app: yes

Issue

I am using Hyper.js and oh-my-zsh. My PROMPT has an emoji (which causes the issue).

When I type a part of a command and press TAB to complete the command - and I get a list of suggestions for completion, the first letter of my command gets duplicated. Typing ls and pressing TAB gives:

🦀 ~ lls
LSCOLORS   ls         lsa        lsappinfo  lsbom      lskq       lsm        lsmp       lsof       lsvfs

When I type dock and the only option to autocomplete is docker it works just fine, and pressing TAB shows 🦀 ~ docker. Pressing TAB again gives

🦀 ~ ddocker
docker                         docker-compose                 docker-credential-osxkeychain  docker-machine

Pressing enter runs docker command and not ddocker so it’s only a visual issue.

The issue occurs only with an emoji in the PROMPT. Issue doesn’t occur in iTerm nor in Terminal.

[jkulak]

Still the same in Hyper.app version: 3.0.0 (stable)

[elegos]

@Stanzilla if the VSCode terminal uses xterm.js, it seems to be an xterm.js problem (same issue). I’m going to open a bug there.