Keep seen/marked view annotators between code review iterations

[oorestisime]

Right now when i mark a file as viewed and it hasnt changed between iterations I have to go through the same files again.

It would be nice if this was working similar to how github does where seen annotations/markers are kept until a file is changed.

This should make the hide viewed files button a bit more streamlined and useful than how it currently behaves.

Unsure if this is an easy change as i havent checked internals but if you keep some kind of state after a feedback then probably we can make a hash based diff of files.

If you feel this is in the right direction i can take a look at it as well!

[backnotprop]

Yeah, this is interesting. I'm already storing viewed state in drafts (in case of crash/refresh). There's probably some type of hash check we can do and reuse through a similar method. I kind of need to think it out, though.