[BUG] No method to insert newlines in Windows Desktop App (v1.1.2685) - Shift+Enter, Ctrl+Enter, and backslash all broken

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?

Bug Description

All methods to insert newlines in the chat input are completely broken in the Windows Desktop App version 1.1.2685.

What Should Happen?

Expected Behavior

Shift+Enter should insert a newline in the chat input box without submitting the message.

Error Messages/Logs

## Actual Behavior
- **Shift+Enter:** Submits the message immediately (does NOT insert newline)
- **Ctrl+Enter:** Submits the message immediately (does NOT insert newline)
- **Backslash `\` + Enter:** Adds backslash character then submits (does NOT insert newline)

Steps to Reproduce

Actual Behavior

• Shift+Enter: Submits the message immediately (does NOT insert newline)
• Ctrl+Enter: Submits the message immediately (does NOT insert newline)
• Backslash \ + Enter: Adds backslash character then submits (does NOT insert newline)

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

Version Information - Claude Code Version: 1.1.2685 (f39a62) - Build Date: 2026-02-10T19:42:56.000Z - Platform: Windows Desktop App - OS: Windows

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

Bug Description

All methods to insert newlines in the chat input are completely broken in the Windows Desktop App version 1.1.2685.

Version Information

• Claude Code Version: 1.1.2685 (f39a62)
• Build Date: 2026-02-10T19:42:56.000Z
• Platform: Windows Desktop App
• OS: Windows

Expected Behavior

Shift+Enter should insert a newline in the chat input box without submitting the message.

Actual Behavior

• Shift+Enter: Submits the message immediately (does NOT insert newline)
• Ctrl+Enter: Submits the message immediately (does NOT insert newline)
• Backslash \ + Enter: Adds backslash character then submits (does NOT insert newline)

Impact

Critical - Users have zero working methods to create multi-line chat inputs, making it impossible to write complex prompts or formatted messages.

Regression

This functionality used to work in a previous version but stopped working after a recent update.

Workaround

None available. Users must use the web version at claude.ai/code to get multi-line functionality.

Related Issues

• #4036
• #19697
• #20988
• #7958