Option+Backspace (delete word) doesn't work on macOS #2237
Description
Problem
On macOS, Option+Backspace (delete previous word) doesn't work in the Copilot CLI input. This is one of the most common editing shortcuts on macOS -- muscle memory kicks in constantly when editing prompts, and nothing happens.
The same goes for Option+Delete (delete next word). Both work fine in the regular shell prompt, but not inside the Copilot CLI input handler.
Current behavior
Pressing Option+Backspace does nothing (or inserts a garbage character depending on terminal emulator).
Expected behavior
Option+Backspace should delete the previous word, same as Ctrl+W does today. Option+Delete should delete the next word.
Context
I know Ctrl+W exists as a workaround, but every other terminal application on macOS respects Option+Backspace -- iTerm2, Warp, Alacritty, Terminal.app. It's the standard macOS way to delete a word, and having to rewire muscle memory just for this one tool is a constant friction point.
The underlying issue is likely that the input library doesn't map the escape sequence that macOS terminals send for Option+Backspace (\x1b\x7f or \x1b\x08 depending on terminal config).
Environment
- macOS (Sequoia)
- Warp terminal (but reproducible in other terminals too)
- Copilot CLI v1.0.10