[BUG] Ctrl-G to edit file in VS Code picks up mouse events after file opens in IDE

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?

A plan is shown in the CLI, in the VS Code Integrated Terminal window.
You press Ctrl-G to view/edit the plan in VS Code.
Any mouse or arrow events that occur over the agent's CLI input are picked up:

<img width="608" height="215" alt="Image" src="https://github.com/user-attachments/assets/8b9c3fda-d5e7-4e9c-8557-027c5b7a09e6" />

What Should Happen?

No arrow/mouse events should show up.

Error Messages/Logs

Steps to Reproduce

Instantiate Claude CLI in a VS Code Integrated Terminal.
Do some prompting or ask it to create a plan.
press Ctrl-G in the prompt area to open the prompt file or plan file in VS code.
Move your mouse over the CLI instance.
Click in the CLI instance and press the arrow keys.

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.154

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

It goes away when you close the plan or prompt file.