[BUG] no line numbers in VS Code plugin for modified files

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?

In the Claude Code plugin for VS Code, when files are modified there are no line numbers displayed but instead as a little square or "tofu".

<img width="604" height="400" alt="Image" src="https://github.com/user-attachments/assets/a4b918aa-8cd5-47f8-a4ab-47ba0a47d0cc" />

What Should Happen?

Line numbers should be rendered. If the line numbers were clickable and it would open (or use an existing editor) to navigate to the line that would be amazing.

If the intention is to NOT show line numbers then remove the tofus or replace them with a renderable glyph.

Error Messages/Logs

Steps to Reproduce

1. in VS Code: ask Claude Code to make a change to a file
2. observe the modified lines have little squares where line numbers typically are

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.84

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_