[BUG] Up arrow in Chat input skips cursor navigation in multi-line text, goes directly to history

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?

restore the previous behavior where Up moves cursor upward within multi-line input, and only falls through to history:previous when already on the first line

What Should Happen?

restore the previous behavior where Up moves cursor upward within multi-line input, and only falls through to history:previous when already on the first line

Error Messages/Logs

Steps to Reproduce

type any multiline prompt and try to go to it's first line through up down arrow, you will find it

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

v2.1.156

Platform

Anthropic API

Operating System

Ubuntu/Debian Linux

Terminal/Shell

Terminal.app (macOS)

Additional Information

_No response_