Only seems to reproduce in gameplay for whatever reason. Can't justify
spending time to chase down why really because the previous code looked
obviously wrong on closer inspection anyway (`rightLayer` has transforms
applied to it on collapse/expand).
Intends to close https://github.com/ppy/osu/issues/32859.
The difference between this and https://github.com/ppy/osu/pull/32942 is
that this PR takes the approach of completely moving the score sorting
behaviour to `IGameplayLeaderboardProvider` implementations.
This is going to be helpful for further work - to be precise, I am
looking to add a leaderboard position indicator in the bottom right of
multiplayer player to match stable, and having the position in the
provider will make the implementation of that *much* easier.
This is a prerequisite for supporting skinning of leaderboards.
- New `IGameplayLeaderboardProvider` and `IGameplayLeaderboardScore`
interfaces are introduced. They are strictly concerned with supplying
leaderboard data.
- Logic of managing display, which was previously jammed into the
inheritance hierarchy of `GameplayLeaderboard`, is now moved into
`IGameplayLeaderboardProvider` implementations. Solo play,
multiplayer, and multiplayer spectator get their own implementation of
the interface.
- The inheritance hierarchy of `GameplayLeaderboard` and per-player
overriding of the implementation of the gameplay leaderboard is gone.
Only one drawable class (renamed to `DrawableGameplayLeaderboard`) is
allowed to display the leaderboards, across all modes of play.