Support Github Copilot Chat

[jmcphers]

Today, Github Copilot works in Positron, but Github Copilot Chat does not. The Chat functionality is provided by a separate Copilot Chat extension as described here:

https://docs.github.com/en/copilot/github-copilot-chat/using-github-copilot-chat-in-your-ide

As far as I can tell from my initial investigation, there is no reason the Copilot Chat extension couldn't work in Positron; it uses fairly new APIs that were developed specifically for its use, but they're all present in the open source version of VS Code.

In Positron, the chat window comes up empty:

The problem seems to be (from Developer Tools) that the copilot chat provider isn't being registered for some reason.

ERR Unknown provider: copilot: Error: Unknown provider: copilot

[yinghawl]

Any update on this request?

[juliasilge]

Not currently, but you can check out GitHub Copilot alternatives that provide chat support in #3871.