[BUG] IME input while scrolled up does not restore viewport to prompt input area

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?

The IME input while scrolled up does not restore viewport to prompt input area.

What Should Happen?

Automatically return the viewport to the input prompt area.

Error Messages/Logs

Steps to Reproduce

1. Switch to CJK IME
2. Open long Claude Code session
3. Scroll up away from input prompt
4. Start typing so that the IME composition window appears.
5. Select/confirm the desired characters from the IME candidate list.
6. Observe that Claude Code does not automatically return the viewport to the input prompt area.

Claude Model

None

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.207 (Claude Code)

Platform

Other

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

Microsoft built-in IME on Windows 11