Allow searching replays by is-MM and rating type.

[Aquanim]

Also displays (primary) rating type on each replay page to non-admins.

[maackey]

Just a few minor suggestions after glancing it over.

[Aquanim]

minor - I'd group up "None" and "Any" just in case additional options are added in the future, it'll be less fragmented

Good point.

Shouldn't Model.GetRatingCategory() return "None" if Model.IsRatedMatch() is false? That would greatly simplify the view, which IMO shouldn't have lots of logic embedded -- it gets messy and hard to style.

That seems like a reasonable take to me, but I'd prefer to tackle it in a separate PR at a later date.

The conditional is redundant around the switch statement.

It is, but all the other filters have a similar conditional around them to check whether filtering on that category is active so I think this makes the file as a whole easier to read, even if it's a little weird in the context of that specific switch statement.

Has flag wont have translation to SQL so this wont work. It would crash unless you dod ToList before. And if you do you are copying battles to memory

dotnet/efcore#2852 suggests that HasFlag does have a translation as of 2016. Certainly it did not throw an error like b.IsRatedMatch() did when I used it in the same place, and I would expect that to have worked if I had mistakenly added a ToList earlier. Can you confirm that this is a problem, and if so what I'm missing?

(In particular, if zkinfra has to be able to work using an old version of LINQ then that would be important to know going forward.)