[Bug] copyOnSelect stops writing to clipboard in 2.1.296 (worked in 2.1.295)
Bug Description
Title: [BUG] copyOnSelect stopped writing to clipboard in 2.1.296 (worked in 2.1.295) — macOS Terminal.app, fullscreen renderer
Environment
- Claude Code 2.1.296 (regressed) / 2.1.295 (working)
- macOS Darwin 25.6.0, Apple Terminal, TERM=xterm-256color
- Local install: ~/.local/share/claude/versions/
- settings.json: "tui": "fullscreen", "copyOnSelect": true
What happens
Drag-selecting text in the TUI highlights normally but writes nothing to the
clipboard. Cmd+V afterwards pastes the previous clipboard contents.
Expected
Selection is copied to the clipboard automatically, as it did through 2.1.295.
Repro
1. macOS Terminal.app, "tui": "fullscreen" and "copyOnSelect": true
2. Start claude
3. Drag across any assistant output
4. Paste into another app — clipboard is unchanged
Regression window
- 2.1.295 installed 2026-10-09 10:03 — copy-on-select worked
- 2.1.296 installed 2026-10-10 15:56 — copy-on-select broken
Same settings file across both.
Ruled out
- Not mouse capture: Terminal's own blue highlight still renders on drag
- Not config: reproduced with tui fullscreen removed, and with
CLAUDE_CODE_DISABLE_MOUSE_CLICKS=1, and with copyOnSelect set explicitly true
- Reproduced in fresh sessions, not just resumed ones
Environment Info
- Platform: darwin
- Terminal: Apple_Terminal
- Version: 2.1.296
- Feedback ID: 1caceeba-1c8b-47bb-973b-563ab9dc51e8