Fix replay download button not working

osu.Game.Tests/Scores/IO/TestScoreEquality.cs

@@ -0,0 +1,73 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+using osu.Game.Scoring;
+
+namespace osu.Game.Tests.Scores.IO
+{
+    [TestFixture]
+    public class TestScoreEquality
+    {
+        [Test]
+        public void TestNonMatchingByReference()
+        {
+            ScoreInfo score1 = new ScoreInfo();
+            ScoreInfo score2 = new ScoreInfo();
+
+            Assert.That(score1, Is.Not.EqualTo(score2));
+        }
+
+        [Test]
+        public void TestMatchingByReference()
+        {
+            ScoreInfo score = new ScoreInfo();
+
+            Assert.That(score, Is.EqualTo(score));
+        }
+
+        [Test]
+        public void TestNonMatchingByPrimaryKey()
+        {
+            ScoreInfo score1 = new ScoreInfo { ID = 1 };
+            ScoreInfo score2 = new ScoreInfo { ID = 2 };
+
+            Assert.That(score1, Is.Not.EqualTo(score2));
+        }
+
+        [Test]
+        public void TestMatchingByPrimaryKey()
+        {
+            ScoreInfo score1 = new ScoreInfo { ID = 1 };
+            ScoreInfo score2 = new ScoreInfo { ID = 1 };
+
+            Assert.That(score1, Is.EqualTo(score2));
+        }
+
+        [Test]
+        public void TestNonMatchingByHash()
+        {
+            ScoreInfo score1 = new ScoreInfo { Hash = "a" };
+            ScoreInfo score2 = new ScoreInfo { Hash = "b" };
+
+            Assert.That(score1, Is.Not.EqualTo(score2));
+        }
+
+        [Test]
+        public void TestMatchingByHash()
+        {
+            ScoreInfo score1 = new ScoreInfo { Hash = "a" };
+            ScoreInfo score2 = new ScoreInfo { Hash = "a" };
+
+            Assert.That(score1, Is.EqualTo(score2));
+        }
+
+        [Test]
+        public void TestNonMatchingByNull()
+        {
+            ScoreInfo score = new ScoreInfo();
+
+            Assert.That(score, Is.Not.EqualTo(null));
+        }
+    }
+}

osu.Game/Scoring/ScoreInfo.cs

@@ -183,10 +183,21 @@ namespace osu.Game.Scoring
 
         public override string ToString() => $"{User} playing {Beatmap}";
 
-        public bool Equals(ScoreInfo other) =>
-            other != null
-            && other.OnlineScoreID == OnlineScoreID
-            && other.BeatmapInfoID == BeatmapInfoID
-            && other.Hash == Hash;
+        public bool Equals(ScoreInfo other)
+        {
+            if (other == null)
+                return false;
+
+            if (ID != 0 && other.ID != 0)
+                return ID == other.ID;
+
+            if (OnlineScoreID.HasValue && other.OnlineScoreID.HasValue)
+                return OnlineScoreID == other.OnlineScoreID;
+
+            if (!string.IsNullOrEmpty(Hash) && !string.IsNullOrEmpty(other.Hash))
+                return Hash == other.Hash;
+
+            return ReferenceEquals(this, other);
+        }
     }
 }