From dad0fa2dca16f672569e1a59bf4d16c54456346b Mon Sep 17 00:00:00 2001
From: smoogipoo <smoogipoo@smgi.me>
Date: Thu, 29 Aug 2019 16:31:40 +0900
Subject: [PATCH] Bind disposal

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

diff --git a/osu.Game/Rulesets/Edit/DrawableEditRuleset.cs b/osu.Game/Rulesets/Edit/DrawableEditRuleset.cs
index 95a1492a45..a12e4ba3ab 100644
--- a/osu.Game/Rulesets/Edit/DrawableEditRuleset.cs
+++ b/osu.Game/Rulesets/Edit/DrawableEditRuleset.cs
@@ -75,5 +75,16 @@ namespace osu.Game.Rulesets.Edit
             drawableRuleset.Playfield.Remove(drawableObject);
             drawableRuleset.Playfield.PostProcess();
         }
+
+        protected override void Dispose(bool isDisposing)
+        {
+            base.Dispose(isDisposing);
+
+            if (beatmap != null)
+            {
+                beatmap.HitObjectAdded -= addHitObject;
+                beatmap.HitObjectRemoved -= removeHitObject;
+            }
+        }
     }
 }