[BUG] Ctrl+G external editor (neovim) breaks Shift+Enter shortcut on exit

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 exiting from the external editor, the shift+enter shortcut no longer works. Only option+enter works.

What Should Happen?

<kbd>Shift</kbd>+<kbd>Enter</kbd> shortcut should work

Error Messages/Logs

Steps to Reproduce

1. Start a Claude Code conversation in iTerm2
2. Hit <kbd>Ctrl</kbd>+<kbd>G</kbd> to open the neovim
3. Exit the neovim
4. Symptom: <kbd>Shift</kbd>+<kbd>Enter</kbd> does not work.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

Not sure

Claude Code Version

2.1.12

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

iTerm2

Additional Information

In the Kitty terminal, there is no issue.