Fixed Session removal from list ServerListTracker. Session class does not have good equality checking.

Author: Stephen Hodgson

Assets/HoloToolkit/Sharing/Scripts/ServerSessionsTracker.cs

@@ -5,7 +5,9 @@
 
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using HoloToolkit.Unity;
+using UnityEngine;
 
 namespace HoloToolkit.Sharing
 {
@@ -166,8 +168,14 @@ private void OnSessionAdded(Session newSession)
 
         private void OnSessionClosed(Session session)
         {
-            SessionClosed.RaiseEvent(session);
-            Sessions.Remove(session);
+            for (int i = 0; i < Sessions.Count; i++)
+            {
+                if (Sessions[i].GetName().ToString().Equals(session.GetName().ToString()))
+                {
+                    SessionClosed.RaiseEvent(session);
+                    Sessions.Remove(session);
+                }
+            }
         }
 
         private void OnServerDisconnected()