Fixed DragCompleted handlers firing incorrectly.

Assets/Fungus/Sprite/Scripts/EventHandlers/DragCompleted.cs

@@ -25,6 +25,7 @@ namespace Fungus
 		public virtual void OnDragEntered(Draggable2D draggableObject, Collider2D targetObject)
 		{
 			if (this.targetObject != null &&
+			    draggableObject == this.draggableObject &&
 			    targetObject == this.targetObject)
 			{
 				overTarget = true;
@@ -34,6 +35,7 @@ namespace Fungus
 		public virtual void OnDragExited(Draggable2D draggableObject, Collider2D targetObject)
 		{
 			if (this.targetObject != null &&
+			    draggableObject == this.draggableObject &&
 			    targetObject == this.targetObject)
 			{
 				overTarget = false;
@@ -45,6 +47,11 @@ namespace Fungus
 			if (draggableObject == this.draggableObject &&
 			    overTarget)
 			{
+				// Assume that the player will have to do perform another drag and drop operation
+				// to complete the drag again. This is necessary because we don't get an OnDragExited if the
+				// draggable object is set to be inactive.
+				overTarget = false;
+				
 				ExecuteSequence();
 			}
 		}