ZWJ sequence emoji in filename titles breaks rendering on Terminal.app

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#650 opened on Sep 30, 2025 0 comments 1 reaction 0 assignees View on GitHub

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Assessment

Difficulty: 4/5
Estimated time: 3-5 days
Newbie friendliness: 38/100

Issue type: Bug
Clarity: Mostly clear
Activity status: Stale
Tech stack: rust
Domain: cli

Research direction

Reproduce with edit on macOS Terminal.app using filenames containing 🏳️‍⚧️ or 🐈‍⬛, then compare with iTerm2 and ASCII filenames. Trace the terminal rendering path implicated by the reproduction; done means ZWJ-emoji filenames no longer break rendering in Terminal.app.

Written by the indexing model from the issue text.

Description

MacOS version: 26.0.1 (25A362)

I've noticed that when you use edit on Terminal.app and edit a file with a ZWJ emoji in the filename (e.g. 🏳️‍⚧️, 🐈‍⬛), it breaks the editor rendering completely:

https://github.com/user-attachments/assets/5fbb3da1-2e2b-477b-a985-28bed5a3b59e

The problem is not reproducible on iTerm2

https://github.com/user-attachments/assets/2aa30843-df14-4af1-8b5a-fc5c50d3a1f0

It also doesn't repro in Terminal.app with ASCII filenames.

Dominant language: Rust
Stars: 14.6k
Forks: 735
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Merged PRs (30d): 4

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