[BUG] "Fullscreen Display" only occupies 1/2 of screen once minimised and reopened

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 requesting prompts in the new Fullscreen Rendering of the Claude Code CLI (in VSCode), all looks fine. But then, when the terminal it occupies is minimized and maximized, the terminal only occupies 1/2 of the screen.

It can sometimes go back to occupying the full screen, but not always.

What Should Happen?

Fullscreen rendering always occupies full terminal view.

Error Messages/Logs

N/A

Steps to Reproduce

1. Open Claude Code CLI in Fullscreen Rendering in VSCode
2. Begin a prompt for processing
3. Minimize terminal
4. Re-maximize terminal

Claude Model

Opus

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.191

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

VS Code integrated terminal

Additional Information

<img width="1514" height="1001" alt="Image" src="https://github.com/user-attachments/assets/5446a4f0-13e4-4c20-9c42-d4cbbf5473c5" />