### Preflight Checklist - [x] I have searched [existing issues](https://github.com/anthropics/claude-code/issues?q=is%3Aissue%20state%3Aopen%20label%3Abug) and this hasn't been reported yet - [x] This is a single bug report (please file separate reports for different bugs) - [x] I am using the latest version of Claude Code ### What's Wrong? Zellij version: 0.44.0 Claude Code version: 2.1.89 Terminal: Kitty on macOS Issue: When in full-screen mode (`CLAUDE_CODE_NO_FLICKER=1`), pressing `F

[BUG] CLAUDE_CODE_NO_FLICKER=1 produces weird rendering artifacts with zellij

Status Fixed / completed

Reported on v2.1.89

Maintainer reply None cached

Activity 3 comments · opened Apr 3, 2026 · closed Apr 7, 2026

Preflight Checklist

[x] I have searched existing issues and this hasn't been reported yet
[x] This is a single bug report (please file separate reports for different bugs)
[x] I am using the latest version of Claude Code

What's Wrong?

Zellij version: 0.44.0
Claude Code version: 2.1.89
Terminal: Kitty on macOS

Issue: When in full-screen mode (CLAUDE_CODE_NO_FLICKER=1), pressing Fn+Up/Fn+Down or using the mouse wheel to scroll produces rendering artifacts (see video).

Legacy scrollback mode renders correctly.

https://github.com/user-attachments/assets/79dd166b-e5ec-4ada-b13c-8eee9d70fbe0

What Should Happen?

The rendering should be normal.

Error Messages/Logs

Steps to Reproduce

Open claude code under a zellij session CLAUDE_CODE_NO_FLICKER=1 claude.
Try to scroll to see the rendering issue.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.89

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

Other

Additional Information

_No response_

View original on GitHub ↗

3 Comments

milanglacier · 4 months ago

Why was this issue closed without comment or update?

I have verified that this issue persists in version 2.1.92; it remains unresolved.

parsakhaz · 4 months ago

this is a huge issue. love claude code but this makes it really really hard to use

hey. it's fixed at the terminal level here

https://github.com/Dcouple-Inc/Pane/pull/120

open source, using xtermjs which is the same terminal as VS Code. feel free to copy this fix or download the latest release to run claude code on any operating system with the fix in place. i was so mad and frustrated at this that I had to fix it myself.

Not just a scrolling issue — also a rendering/layout problem in VS Code's side-by-side panel mode. When Claude Code runs in VS Code with the terminal on one side and the editor on the other, text formatting breaks in unpredictable ways. Options and multi-line output get weirdly split left-right, text wraps incorrectly, and the whole experience feels janky rather than fluid. Combined with the scroll-jumping, longer sessions in VS Code become genuinely hard to follow. This isn't just macOS standalone terminal — it's very much a VS Code integrated terminal issue too.

yeah i had to switch off cursor/vscode and build myself an ide that managed xtermjs (the library they both use) well enough for the complex TUIs to not break.

works great and i have a fix for the scroll jump i just implemented rn here