Fix too many event rows displaying after spending a long time in gameplay/results

osu.Game.Tests/Visual/DailyChallenge/TestSceneDailyChallengeEventFeed.cs

@@ -6,6 +6,7 @@
 using osu.Framework.Extensions.ObjectExtensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Shapes;
+using osu.Framework.Testing;
 using osu.Framework.Utils;
 using osu.Game.Online.API.Requests.Responses;
 using osu.Game.Overlays;
@@ -17,14 +18,14 @@ namespace osu.Game.Tests.Visual.DailyChallenge
 {
     public partial class TestSceneDailyChallengeEventFeed : OsuTestScene
     {
+        private DailyChallengeEventFeed feed = null!;
+
         [Cached]
         private OverlayColourProvider colourProvider = new OverlayColourProvider(OverlayColourScheme.Plum);
 
-        [Test]
-        public void TestBasicAppearance()
+        [SetUpSteps]
+        public void SetUpSteps()
         {
-            DailyChallengeEventFeed feed = null!;
-
             AddStep("create content", () => Children = new Drawable[]
             {
                 new Box
@@ -40,6 +41,7 @@ public void TestBasicAppearance()
                     Origin = Anchor.Centre,
                 }
             });
+
             AddSliderStep("adjust width", 0.1f, 1, 1, width =>
             {
                 if (feed.IsNotNull())
@@ -50,7 +52,11 @@ public void TestBasicAppearance()
                 if (feed.IsNotNull())
                     feed.Height = height;
             });
+        }
 
+        [Test]
+        public void TestBasicAppearance()
+        {
             AddRepeatStep("add normal score", () =>
             {
                 var ev = new NewScoreEvent(1, new APIUser
@@ -90,5 +96,24 @@ public void TestBasicAppearance()
                 feed.AddNewScore(ev);
             }, 50);
         }
+
+        [Test]
+        public void TestMassAdd()
+        {
+            AddStep("add 1000 scores at once", () =>
+            {
+                for (int i = 0; i < 1000; i++)
+                {
+                    var ev = new NewScoreEvent(1, new APIUser
+                    {
+                        Id = 2,
+                        Username = "peppy",
+                        CoverUrl = "https://osu.ppy.sh/images/headers/profile-covers/c3.jpg",
+                    }, RNG.Next(1_000_000), null);
+
+                    feed.AddNewScore(ev);
+                }
+            });
+        }
     }
 }

osu.Game/Screens/OnlinePlay/DailyChallenge/DailyChallengeEventFeed.cs

@@ -22,6 +22,8 @@ public partial class DailyChallengeEventFeed : CompositeDrawable
 
         public Action<long>? PresentScore { get; init; }
 
+        private readonly Queue<NewScoreEvent> newScores = new Queue<NewScoreEvent>();
+
         [BackgroundDependencyLoader]
         private void load()
         {
@@ -47,19 +49,27 @@ private void load()
 
         public void AddNewScore(NewScoreEvent newScoreEvent)
         {
-            var row = new NewScoreEventRow(newScoreEvent)
-            {
-                Anchor = Anchor.BottomCentre,
-                Origin = Anchor.BottomCentre,
-                PresentScore = PresentScore,
-            };
-            flow.Add(row);
+            newScores.Enqueue(newScoreEvent);
+
+            // ensure things don't get too out-of-hand.
+            if (newScores.Count > 25)
+                newScores.Dequeue();
         }
 
         protected override void Update()
         {
             base.Update();
 
+            while (newScores.TryDequeue(out var newScore))
+            {
+                flow.Add(new NewScoreEventRow(newScore)
+                {
+                    Anchor = Anchor.BottomCentre,
+                    Origin = Anchor.BottomCentre,
+                    PresentScore = PresentScore,
+                });
+            }
+
             for (int i = 0; i < flow.Count; ++i)
             {
                 var row = flow[i];