Remove unnecessary time property

osu.Game/Beatmaps/ControlPoints/ControlPoint.cs

@@ -19,11 +19,10 @@ public abstract class ControlPoint : IComparable<ControlPoint>
         public int CompareTo(ControlPoint other) => Time.CompareTo(other.Time);
 
         /// <summary>
-        /// Whether this control point results in a meaningful change when placed after another.
+        /// Determines whether this <see cref="ControlPoint"/> results in a meaningful change when placed alongside another.
         /// </summary>
         /// <param name="existing">An existing control point to compare with.</param>
-        /// <param name="time">The time this control point will be placed at if it is added.</param>
-        /// <returns>Whether redundant.</returns>
-        public abstract bool IsRedundant(ControlPoint existing, double time);
+        /// <returns>Whether this <see cref="ControlPoint"/> is redundant when placed alongside <paramref name="existing"/>.</returns>
+        public abstract bool IsRedundant(ControlPoint existing);
     }
 }

osu.Game/Beatmaps/ControlPoints/ControlPointInfo.cs

@@ -247,7 +247,7 @@ private bool checkAlreadyExisting(double time, ControlPoint newPoint)
                     break;
             }
 
-            return newPoint.IsRedundant(existing, time);
+            return newPoint.IsRedundant(existing);
         }
 
         private void groupItemAdded(ControlPoint controlPoint)

osu.Game/Beatmaps/ControlPoints/DifficultyControlPoint.cs

@@ -27,7 +27,7 @@ public double SpeedMultiplier
             set => SpeedMultiplierBindable.Value = value;
         }
 
-        public override bool IsRedundant(ControlPoint existing, double time)
+        public override bool IsRedundant(ControlPoint existing)
             => existing is DifficultyControlPoint existingDifficulty
                && SpeedMultiplier == existingDifficulty.SpeedMultiplier;
     }

osu.Game/Beatmaps/ControlPoints/EffectControlPoint.cs

@@ -35,7 +35,7 @@ public bool KiaiMode
             set => KiaiModeBindable.Value = value;
         }
 
-        public override bool IsRedundant(ControlPoint existing, double time)
+        public override bool IsRedundant(ControlPoint existing)
             => !OmitFirstBarLine
                && existing is EffectControlPoint existingEffect
                && KiaiMode == existingEffect.KiaiMode

osu.Game/Beatmaps/ControlPoints/SampleControlPoint.cs

@@ -68,7 +68,7 @@ public virtual HitSampleInfo ApplyTo(HitSampleInfo hitSampleInfo)
             return newSampleInfo;
         }
 
-        public override bool IsRedundant(ControlPoint existing, double time)
+        public override bool IsRedundant(ControlPoint existing)
             => existing is SampleControlPoint existingSample
                && SampleBank == existingSample.SampleBank
                && SampleVolume == existingSample.SampleVolume;

osu.Game/Beatmaps/ControlPoints/TimingControlPoint.cs

@@ -49,6 +49,6 @@ public double BeatLength
         public double BPM => 60000 / BeatLength;
 
         // Timing points are never redundant as they can change the time signature.
-        public override bool IsRedundant(ControlPoint existing, double time) => false;
+        public override bool IsRedundant(ControlPoint existing) => false;
     }
 }

osu.Game/Beatmaps/Formats/LegacyDecoder.cs

@@ -174,8 +174,8 @@ public override HitSampleInfo ApplyTo(HitSampleInfo hitSampleInfo)
                 return baseInfo;
             }
 
-            public override bool IsRedundant(ControlPoint existing, double time)
-                => base.IsRedundant(existing, time)
+            public override bool IsRedundant(ControlPoint existing)
+                => base.IsRedundant(existing)
                    && existing is LegacySampleControlPoint existingSample
                    && CustomSampleBank == existingSample.CustomSampleBank;
         }