Bug: Restoring previous versions doesn't work correctly (due to stale data)

[holdenmatt]

I believe this is a bug caused by a stale data issue with SWR.

Steps:

1. Create an artifact of some type (such as a sheet)
2. Open it and make an edit, wait for it to save
3. Make a 2nd edit, wait for it to save
4. Click "View previous version", then "Restore this version" in the footer

Expected:

• The previous version is restored

Actual:

• Both edits are discarded, and document reverts to the first version (not the one that was visible on screen)

Note: This bug does NOT occur if you first focus on another window or tab, then return to the app's tab prior to clicking undo/restore (I think because SWR is revalidating on focus).

I believe the issue is that "revalidate" is set to false when we save new document versions, on this line:
https://github.com/vercel/ai-chatbot/blob/main/components/artifact.tsx#L164

So the client is working from stale data when it decides which document versions to delete. Changing "revalidate" to true there fixes the issue, but I'm not sure why it was there in the first place so I don't know if this will cause other issues?