[BUG] Shift enter sends new message, instead of adding newline

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?

Shift enter sends new message, instead of adding newline
bug in v2.1.50, works in .49

What Should Happen?

Newline

Error Messages/Logs

n/a

Steps to Reproduce

Try to use shift + enter, sends message

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

2.1.49

Claude Code Version

2.1.50

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

_No response_