Move invalidation issue todo to tests

osu.Game.Tests/Visual/SongSelect/TestSceneLeaderboardScoreV2.cs

@@ -34,6 +34,8 @@ namespace osu.Game.Tests.Visual.SongSelect
         [BackgroundDependencyLoader]
         private void load()
         {
+            // TODO: invalidation seems to be one-off when clicking slider to a certain value, so drag for now
+            // doesn't seem to happen in-game (when toggling window mode)
             AddSliderStep("change relative width", 0, 1f, 0.6f, v =>
             {
                 relativeWidth = v;

osu.Game/Online/Leaderboards/LeaderboardScoreV2.cs

@@ -510,8 +510,6 @@ namespace osu.Game.Online.Leaderboards
         {
             Scheduler.AddOnce(() =>
             {
-                // TODO: may not always invalidate as expected
-
                 // when width decreases
                 // - hide statistics, then
                 // - hide avatar, then