Ranked Play: Work around rating data not always including user

osu.Game.Tests/Visual/Matchmaking/TestSceneRatingDistributionGraph.cs

@@ -61,6 +61,37 @@ public void TestNoData()
             AddStep("set empty data", () => graph.SetData([], null));
         }
 
+        [Test]
+        public void TestOutOfBoundsUserRating()
+        {
+            AddStep("set data with max user rating", () =>
+            {
+                List<(int x, int y)> values = new List<(int x, int y)>();
+                for (int i = 400; i <= 2800; i += 100)
+                    values.Add((i, (int)Math.Round(generateCount(i, 1600, 400, 7200))));
+
+                graph.SetData(values.ToArray(), 4000);
+            });
+
+            AddStep("set data with min user rating", () =>
+            {
+                List<(int x, int y)> values = new List<(int x, int y)>();
+                for (int i = 400; i <= 2800; i += 100)
+                    values.Add((i, (int)Math.Round(generateCount(i, 1600, 400, 7200))));
+
+                graph.SetData(values.ToArray(), 0);
+            });
+
+            AddStep("set data with only user rating", () =>
+            {
+                List<(int x, int y)> values = new List<(int x, int y)>();
+                for (int i = 400; i <= 2800; i += 100)
+                    values.Add((i, (int)Math.Round(generateCount(i, 1600, 400, 7200))));
+
+                graph.SetData([], 1500);
+            });
+        }
+
         private static double generateCount(double x, double mean, double stdDev, double amplitude)
         {
             return amplitude * Math.Exp(-Math.Pow(x - mean, 2) / (2 * Math.Pow(stdDev, 2))) + Random.Shared.Next(300);

osu.Game/Screens/OnlinePlay/Matchmaking/Queue/RatingDistributionGraph.cs

@@ -236,9 +236,21 @@ public void SetData((int x, int y)[] data, int? userRating)
                 data.Zip(data.Skip(1), (a, b) => Math.Abs(b.x - a.x)).DefaultIfEmpty().Min()
             );
 
+            if (userRating < xRange.min)
+            {
+                this.data = this.data.Prepend((userRating.Value, 1)).ToArray();
+                xRange.min = userRating.Value;
+            }
+
+            if (userRating > xRange.max)
+            {
+                this.data = this.data.Append((userRating.Value, 1)).ToArray();
+                xRange.max = userRating.Value;
+            }
+
             yRange = (
                 0,
-                (int)roundToSignificant(data.Select(d => d.y).DefaultIfEmpty().Max())
+                (int)roundToSignificant(this.data.Select(d => d.y).DefaultIfEmpty().Max())
             );
 
             updateGraph();