[BUG] : Ctrl+Shift+C should fall through to Ctrl+C (copy) when no action is bound to it.

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?

Problem: In the Claude Code desktop app (Windows), Ctrl+Shift+C does nothing. It should copy selected text to the clipboard, just like Ctrl+C does.

Why this matters: Ctrl+Shift+C is the standard copy shortcut in terminal emulators (Windows Terminal, VS Code integrated terminal, Git Bash, etc.) because Ctrl+C is reserved for SIGINT. Users who frequently switch between Claude Code desktop and a terminal build muscle memory around Ctrl+Shift+C for copy. When it silently does nothing in Claude Code desktop, it's confusing — you think you copied something, switch to another app to paste, and get stale clipboard contents.

What Should Happen?

Expected behavior: When a keybinding like Ctrl+Shift+C has no action mapped to it in the keybindings system, the keypress should fall through to the default OS/Electron handler. Since Electron's default behavior for Ctrl+C is copy, and Ctrl+Shift+C is an unbound superset of that, it should either:

1. Fall through to the OS-level clipboard copy, or
2. Be explicitly mapped as an alias for copy by default

Current behavior: The keypress appears to be intercepted by the keybinding layer and swallowed, preventing it from reaching the Electron/OS clipboard handler.

Error Messages/Logs

Steps to Reproduce

1. Select any text in the Claude Code Desktop app conversation
2. Press Ctrl+Shift+C
3. Attempt to paste in another application

Expected: Selected text is copied to clipboard
Actual: Nothing is copied; clipboard retains its previous contents. Ctrl+C works correctly for the same selection.

Claude Model

None

Is this a regression?

I don't know

Last Working Version

_No response_

Claude Code Version

2.1.85

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

_No response_