Cody: Apply fixups by default

[umpox]

Fixups should apply by default. We should provide the codelens options:

• "Done" -> (Hide codelens)
• "Diff"
• "Edited by Cody" -> non-clickable

Undo/Revert should be possible using normal undo flow

[toolmantim]

I put together a design for this @umpox, including the ability to "Retry" with an updated prompt (replacing "Regenerate" in #1383):

https://www.figma.com/file/kcXB8qZDpOGqWImwuvX6yq/Auto-applied-edits%2C-retryable-w%2F-new-updated-prompt?type=design&node-id=0-1&mode=design

It does include the idea of "Undo". And the way "Retry" is designed, it would do an undo then reattempt the edit with the new prompt, which is what a lot of other code AI tools are doing.

If it's not possible to implement "Undo" at all, we could have "Retry" just edit over the top and I think the UI labelling still works.

"Edited by Cody" -> non-clickable

I think every code lens action has to map to an action and be clickable.

Instead of "Diff" we can make the first "Edits Applied" action show the diff instead. That would be slightly less discoverable, but the diff view isn't great to use, and most people have a git diff too… so I think that's the right balance?

[umpox]

@toolmantim Thanks, will update some things!

[umpox]

@toolmantim I think every code lens action has to map to an action and be clickable.

Actually it's possible to provide an empty command and the codelens action will still show, but will be unclickable and won't have the usual hover etc effects of a button. Although this is a recent undocumented change I believe (as with so many VS Code changes)

Makes sense though. I've made these changes in this PR: #1411

We now have Undo and Retry logic, LMK what you think