Make AutoSaveManager::getAutoSaveKey static

I was half expecting Wim would have suggested this overnight too :)

I was half expecting Wim would have suggested this overnight too :)

I did think that originally, actually, but this is in an area that is likely to continue to evolve, so it wasn't worth even having that nitpicky discussion :)

LGTM, but the e2e changes should be reverted.

There's an e2e change in there that I failed to remove 😅

Thanks for doing that chore, @larowlan — I'd have done it myself but ran out of time (and steam) yesterday.

Automatically closed - issue fixed for 2 weeks with no activity.