Double-Escape cancellation hangs indefinitely on v1.0.19 (macOS)

[dezgit2025]

Description

When pressing Escape twice (double-Escape) to cancel an operation in Copilot CLI v1.0.19, the CLI gets stuck in a "Cancelling" state indefinitely. It never completes the cancellation — the yellow "Cancelling" indicator stays on screen and the CLI becomes unresponsive. The only recovery is to force-quit the process.

Steps to Reproduce

1. Start an interactive Copilot CLI session (copilot)
2. Submit a prompt that triggers tool execution (e.g., a shell command or multi-step task)
3. While the agent is executing, press Escape twice to cancel
4. Observe: CLI shows ● Cancelling but never returns to the prompt

Expected Behavior

Double-Escape should cancel the current operation and return to the input prompt within a few seconds, as documented in the help text.

Actual Behavior

The CLI hangs on ● Cancelling indefinitely. No timeout. No recovery. Must force-quit.

Environment

• Copilot CLI version: 1.0.19 (stable)
• OS: macOS (Apple Silicon, ARM64)
• Shell: zsh
• Terminal: macOS Terminal.app
• Install method: Install script (gh.io/copilot-install)

Notes

• The v1.0.12 changelog mentions "Pressing Escape multiple times during autopilot cancellation no longer leaves the session stuck" — this fix may have regressed or may not cover the non-autopilot interactive mode case.
• Reproducible across different types of operations (shell commands, tool calls).