From 4b393209ec2715fb57ce3750e8fab11e572cb8d1 Mon Sep 17 00:00:00 2001
From: smoogipoo <smoogipoo@smgi.me>
Date: Mon, 12 Jul 2021 17:33:29 +0900
Subject: [PATCH] Implement UnbindFrom()

---
 osu.Game/Rulesets/Mods/DifficultyBindable.cs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/osu.Game/Rulesets/Mods/DifficultyBindable.cs b/osu.Game/Rulesets/Mods/DifficultyBindable.cs
index cf86e9ad19..ff859de30b 100644
--- a/osu.Game/Rulesets/Mods/DifficultyBindable.cs
+++ b/osu.Game/Rulesets/Mods/DifficultyBindable.cs
@@ -115,6 +115,17 @@ public override void BindTo(Bindable<float?> them)
             ExtendedMaxValue = otherDifficultyBindable.extendedMaxValue;
         }
 
+        public override void UnbindFrom(IUnbindable them)
+        {
+            if (!(them is DifficultyBindable otherDifficultyBindable))
+                throw new InvalidOperationException($"Cannot unbind from a non-{nameof(DifficultyBindable)}.");
+
+            base.UnbindFrom(them);
+
+            CurrentNumber.UnbindFrom(otherDifficultyBindable.CurrentNumber);
+            ExtendedLimits.UnbindFrom(otherDifficultyBindable.ExtendedLimits);
+        }
+
         public new DifficultyBindable GetBoundCopy() => new DifficultyBindable { BindTarget = this };
     }
 }