Fix Autosave "changed by another application " Spam

[thecoolwinter]

Description

Fixes an issue where a file save would not correctly update the CodeFileDocument's metadata when saving. This caused scheduled autosave operations to fail with a false positive 'changed by another application' error.

To fix, I'm allowing NSDocument to handle the actual file system operation, rather than writing the data like we were before. I've kept the extra logic in the overridden save method to fix broken directories. There's no good reason to move the file saving operation out of NSDocument, since that subclass likely handles it better than we do with an atomic data write.

I've also moved autosave scheduling out of UI and into the document class.

Related Issues

• closes 🐞 File Saving Throwing "Modified By Another Program" Error #2033

Checklist

• I read and understood the contributing guide as well as the code of conduct
• The issues this PR addresses are related to each other
• My changes generate no new warnings
• My code builds and runs on my machine
• My changes are all related to the related issue above
• I documented my code

Screenshots

N/A