[BUG] claude window scrolls randomly when i click or scroll a code window

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?

version 2.1.2

especially prevalent when I have more than one Claude code window open.
Editing and scrolling unrelated code window should make claude code window scroll to crazzy places.

<img width="3840" height="1080" alt="Image" src="https://github.com/user-attachments/assets/126b45c5-5725-449a-822b-810a8e495b28" />
look at claude window on right, it is position near bottom.

<img width="3840" height="1080" alt="Image" src="https://github.com/user-attachments/assets/79e35b4d-0f6f-4a0b-a1cd-1f74c7b19cce" />

do not touch claude windown, click in code edit window, and claude window scrolls to random location .

What Should Happen?

scolling the code window should have no affect on the claude windown

Error Messages/Logs

Steps to Reproduce

lauch claude
detach the claude window
open a terminal at bottom of screen
type claude code
in the detach window, create a bunch of output by asking claude stuff.
scroll the detach window 1 page up.
now go the code window, and click on code window
the detached claude code window scrolls to a random location.

Claude Model

Opus

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.2

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_