[BUG] Shift enter not working on macOS Tahoe within IntelliJ terminal

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 running Claude Code within an IntelliJ terminal shift-enter does not create a new line.

When running within iTerm shift-enter works as expected.

Work around is Ctrl-J, but muscle memory...

What Should Happen?

Shift enter should create a new line when Claude Code is running in any terminal.

Error Messages/Logs

Steps to Reproduce

Start claude. Enter text and then press shift-enter.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

I have a tab on 2.0.5 in which this is working

Claude Code Version

2.0.10 (first noticed in 2.0.9)

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

_No response_