[BUG] Multiple panel sessions rapidly steal input focus from each other when VS Code window regains OS focus

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 multiple Claude Code chat sessions are open simultaneously in separate editor groups/columns in VS Code, bringing the VS Code window back into OS focus (e.g. switching from another app) causes the input boxes of the open panels to rapidly flicker/cycle focus between each other for a moment, instead of only the previously-active panel's input regaining focus.

What Should Happen?

Only the single actually-active/visible panel's input box should regain focus when the VS Code window regains OS focus. The other open-but-inactive panels should not steal or compete for focus.

Error Messages/Logs

Steps to Reproduce

1. Open 3+ Claude Code chat sessions, each in its own editor group/split column
2. Switch focus away from VS Code to a different application
3. Switch focus back to VS Code
4. Observe: input focus rapidly flickers between the open panels' input boxes for a moment before settling

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.177 (Claude Code) — CLI VS Code extension: anthropic.claude-code 2.1.283

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_