[BUG] Selecting text repeats lines

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?

When selecting text in vscode claude code extension window, the text overlaps

<img width="797" height="116" alt="Image" src="https://github.com/user-attachments/assets/8edb7a47-7ea5-444c-9cf4-1b3c702a9264" />

What Should Happen?

Only selected text should appear selected

Error Messages/Logs

Steps to Reproduce

• Open VS Code Claude Code extension
• Type long text
• Select some lines
• Some lines overlap

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.150 (Claude Code)

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_