[BUG] [BUG] Claude spam repeating itself after terminal goes through size changed (opening source directory, terminal column, etc.)

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 I run Claude in say a "wide" terminal, but then need to quickly re-open the source directory or switch terminals, it begins to bug out. It starts to repeat itself over and over. When then typing a new prompt it starts spamming the lines used to outline the prompt area, flooding the space and making it hard to read or keep track.

<img width="1480" height="1312" alt="Image" src="https://github.com/user-attachments/assets/f77b8ed0-4066-4fe0-ace8-67d209fc5644" />

What Should Happen?

The terminal should be able to handle sudden/dynamic width changes to its terminal, ensuring that it does not suddenly begin to bug out and spam the same message multiple times.

Error Messages/Logs

Steps to Reproduce

1. Run Claude in a fresh terminal.
2. May vary, but from there try to open the source directory/adjust the width of the column. If it does not cause the issue, attempt to write a prompt to Claude then try again.
3. Close/reduce the size of the column you opened (Source directory for example).

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.0.33 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_