fix alive hitobjects blocking hits in taiko with hd

osu.Game.Rulesets.Taiko.Tests/Mods/TestSceneTaikoModHidden.cs

@@ -1,24 +1,71 @@
 // 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 System;
+using System.Collections.Generic;
 using System.Linq;
 using NUnit.Framework;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.ControlPoints;
 using osu.Game.Rulesets.Taiko.Mods;
+using osu.Game.Rulesets.Taiko.Objects;
 
 namespace osu.Game.Rulesets.Taiko.Tests.Mods
 {
     public partial class TestSceneTaikoModHidden : TaikoModTestScene
     {
+        private Func<bool> checkAllMaxResultJudgements(int count) => ()
+            => Player.ScoreProcessor.JudgedHits >= count
+               && Player.Results.All(result => result.Type == result.Judgement.MaxResult);
+
         [Test]
         public void TestDefaultBeatmapTest() => CreateModTest(new ModTestData
         {
             Mod = new TaikoModHidden(),
             Autoplay = true,
-            PassCondition = checkSomeAutoplayHits
+            PassCondition = checkAllMaxResultJudgements(4),
         });
 
-        private bool checkSomeAutoplayHits()
-            => Player.ScoreProcessor.JudgedHits >= 4
-               && Player.Results.All(result => result.Type == result.Judgement.MaxResult);
+        [Test]
+        public void TestHitTwoNotesWithinShortPeriod()
+        {
+            const double hit_time = 1;
+
+            var beatmap = new Beatmap<TaikoHitObject>
+            {
+                HitObjects = new List<TaikoHitObject>
+                {
+                    new Hit
+                    {
+                        Type = HitType.Rim,
+                        StartTime = hit_time,
+                    },
+                    new Hit
+                    {
+                        Type = HitType.Centre,
+                        StartTime = hit_time * 2,
+                    },
+                },
+                BeatmapInfo =
+                {
+                    Difficulty = new BeatmapDifficulty
+                    {
+                        SliderTickRate = 4,
+                        OverallDifficulty = 0,
+                    },
+                    Ruleset = new TaikoRuleset().RulesetInfo
+                },
+            };
+
+            beatmap.ControlPointInfo.Add(0, new EffectControlPoint { ScrollSpeed = 0.1f });
+
+            CreateModTest(new ModTestData
+            {
+                Mod = new TaikoModHidden(),
+                Autoplay = true,
+                PassCondition = checkAllMaxResultJudgements(2),
+                Beatmap = beatmap,
+            });
+        }
     }
 }

osu.Game.Rulesets.Taiko/Mods/TaikoModHidden.cs

@@ -57,6 +57,12 @@ protected override void ApplyNormalVisibilityState(DrawableHitObject hitObject,
                     {
                         hitObject.FadeOut(duration);
 
+                        // Keep updating the object even after it stopped being visible.
+                        // This is required because of the custom logic in DrawableHit's Update method.
+                        // Specifically, pressHandledThisFrame wasn't reset, which caused further hits
+                        // within the object's lifetime to be rejected.
+                        hitObject.AlwaysPresent = true;
+
                         // DrawableHitObject sets LifetimeEnd to LatestTransformEndTime if it isn't manually changed.
                         // in order for the object to not be killed before its actual end time (as the latest transform ends earlier), set lifetime end explicitly.
                         hitObject.LifetimeEnd = state == ArmedState.Idle || !hitObject.AllJudged