Unfold/Unview all files

[gempir]

Feature Description

I find myself coming back to PRs a lot, or after a code review of a Colleague I need to look at my own PR and when I want to review old files it's annoying to unclick "viewed" one-by-one.

I think there are multiple options of achieving this, I'm unsure which is the best approach.

1. A button that marks all files as unviewed (maybe it can also do mark as viewed for double utility)
2. Just have a button expand/fold all files and leaving the viewed status alone
3. Reset the view status after a PR merge (this only helps in some cases, and might just be confusing, so worst option IMO)
4. ???

I don't see any way that GitHub solves this. I think you also need to manually unfold files there.
Maybe there is a better solution I'm not seeing yet?

Screenshots

No response

[sillyguodong]

I will try to implement it with your first option