[Bug] Ctrl+G editor broken in v1.0.49 — every keypress requires pressing twice, Ctrl+X unresponsive in nano

[markandrewkato]

Describe the bug

[Bug] Ctrl+G editor broken in v1.0.49 — keypresses require pressing twice

What happened

Since v1.0.49, the editor opened via Ctrl+G has a broken PTY:

• Every keypress must be pressed twice to register
• Ctrl+X is completely unresponsive in nano (can't exit)
• After closing the editor, CLI shows Waiting for editor process to exit... and requires an extra keypress

Versions

• v1.0.49 — broken
• v1.0.48 — works fine (confirmed on separate machine)

Steps to reproduce

1. Launch copilot
2. Press Ctrl+G to open the editor
3. Type any character — nothing appears until pressed twice

Investigation

Not caused by editor config — confirmed with EDITOR="vim -u NONE", same issue. ps shows the correct process spawning:

vim -u NONE /var/folders/.../COPILOT_PROMPT.md

Same broken behavior with nano. Editor works normally outside of Copilot CLI.

Environment

• macOS Apple Silicon (arm64)
• Copilot CLI 1.0.49
• Editors tested: Vim 9.1, nano

Affected version

No response

Steps to reproduce the behavior

No response

Expected behavior

No response

Additional context

No response

[saml]

$ brew uninstall copilot-cli
$ brew install --cask copilot-cli@1.0.48
Warning: Cask 'copilot-cli@1.0.48' is unavailable: No Cask with this name exists.
$ brew install --cask https://raw.githubusercontent.com/Homebrew/homebrew-cask/33f8672caaa18f274fe008d7831856c01c3381e0/Casks/c/copilot-cli.rb
Warning: Cask 'copilot-cli' is unavailable: No Cask with this name exists.

How do I downgrade copilot-cli on mac using homebrew?