Close callbacks on Scatter are now removed on close.

lib/scatter.js

@@ -371,6 +371,7 @@ export class AbstractScatter extends Throwable {
 
     close() {
         this._callCloseCallbacks()
+        this._removeCallbacks()
         this._removeSelfFromScatterContainer()
     }
 
@@ -380,6 +381,10 @@ export class AbstractScatter extends Throwable {
         }
     }
 
+    _removeCallbacks(){
+        this.onClose = []
+    }
+
     _removeSelfFromScatterContainer() {
         /**
             Removes self from container when it's closed.