[Bug]: OSC 52 clipboard copying fails when window/block not focused

[robottwo]

Describe the bug

Wave Terminal's OSC 52 (clipboard) implementation requires both window and block focus, which breaks application-initiated clipboard copying when the terminal doesn't have focus. This causes issues with tools like OpenCode/Claude Code that use OSC 52 for programmatic clipboard operations.

To Reproduce

1. Open Wave Terminal
2. Run a terminal application that uses OSC 52 to copy text (e.g., OpenCode, tmux with OSC 52 enabled, Neovim with clipboard integration)
3. Trigger a copy operation from the application
4. The copy fails silently if Wave Terminal window or the specific block doesn't have focus

Example test:

printf '\033]52;c;%s\a' "$(echo -n 'test copy' | base64)"

This works in iTerm2, Alacritty, kitty, and other terminals regardless of focus state, but fails in Wave Terminal when the window/block isn't focused.

Expected behavior

OSC 52 clipboard writes should succeed regardless of terminal focus state. The security model for OSC 52 is already well-established:

• Most terminals allow writes without focus (standard behavior)
• Reads (query with ?) are blocked for security (which Wave correctly does)
• Size limits prevent abuse (Wave has appropriate 75KB limit)

This is particularly important for:

• AI coding assistants (OpenCode, Cursor, etc.) that copy code snippets
• Terminal multiplexers (tmux, screen) with clipboard integration
• Remote editing workflows (Vim/Neovim over SSH)

Code Reference

The focus check is in frontend/app/view/term/termwrap.ts:

function handleOsc52Command(data: string, blockId: string, loaded: boolean, termWrap: TermWrap): boolean {
    if (!loaded) {
        return true;
    }
    const isBlockFocused = termWrap.nodeModel ? globalStore.get(termWrap.nodeModel.isFocused) : false;
    if (!document.hasFocus() || !isBlockFocused) {
        console.log("OSC 52: rejected, window or block not focused");
        return true;  // ← This rejects valid clipboard operations
    }
    // ... rest of implementation is correct
}

Suggested Fix

Remove the focus check for OSC 52 writes. The existing size limits and query blocking provide adequate security:

function handleOsc52Command(data: string, blockId: string, loaded: boolean, termWrap: TermWrap): boolean {
    if (!loaded) {
        return true;
    }
    // Remove: if (!document.hasFocus() || !isBlockFocused) check
    
    // Keep all existing validation (size limits, query blocking, etc.)
    // ...
}

Desktop

• OS: macOS 15.2
• Wave Terminal: v0.13.1 (but affects all versions with OSC 52 support)
• Also affects: Linux, Windows

Related

• Clipboard shortcuts do not work on Linux #206 (clipboard shortcuts on Linux) - may share root cause
• Standard terminal behavior reference: https://invisible-island.net/xterm/ctlseqs/ctlseqs.html#h3-Operating-System-Commands