* Stop warnings about non existent scene presences/entities being removed on client log off

* This is being done by preventing close from being called twice on child agent closure (nres which would have been thrown are being swallowed).  
* However, it should be possible to do much better cleanup on this code in the future

OpenSim/Framework/Communications/Cache/UserProfileCacheService.cs

@@ -86,7 +86,9 @@ namespace OpenSim.Framework.Communications.Cache
                 }
             }
 
-            m_log.ErrorFormat("[USER CACHE]: Tried to remove the profile of user {0}, but this was not in the scene", userId);
+            m_log.WarnFormat(
+                "[USER CACHE]: Tried to remove the profile of user {0}, but this was not in the scene", userId);
+            
             return false;
         }
 

OpenSim/Region/ClientStack/LindenUDP/LLClientView.cs

@@ -454,18 +454,26 @@ namespace OpenSim.Region.ClientStack.LindenUDP
         /// <param name="shutdownCircuit"></param>
         public void Close(bool shutdownCircuit)
         {
-            // Pull Client out of Region
+            m_log.DebugFormat(
-            m_log.Info("[CLIENT]: Close has been called");
+                "[CLIENT]: Close has been called with shutdownCircuit = {0} on scene {1}", 
+                shutdownCircuit, m_scene.RegionInfo.RegionName);
+            
             m_PacketHandler.Flush();
 
-            //raiseevent on the packet server to Shutdown the circuit
+            // raise an event on the packet server to Shutdown the circuit
+            // Now, if we raise the event then the packet server will call this method itself, so don't try cleanup
+            // here otherwise we'll end up calling it twice.
+            // FIXME: In truth, I might be wrong but this whole business of calling this method twice (with different args) looks
+            // horribly tangly.  Hopefully it should be possible to greatly simplify it.
             if (shutdownCircuit)
             {
                 OnConnectionClosed(this);
             }
-
+            else
+            {
                 CloseCleanup(shutdownCircuit);
             }
+        }
 
         public void Kick(string message)
         {

OpenSim/Region/Environment/Scenes/InnerScene.cs

@@ -584,26 +584,26 @@ namespace OpenSim.Region.Environment.Scenes
         {
             lock (Entities)
             {
-                if (Entities.Remove(agentID))
+                if (!Entities.Remove(agentID))
-                {
-                    //m_log.InfoFormat("[SCENE] Removed scene presence {0} from entities list", agentID);
-                }
-                else
                 {
                     m_log.WarnFormat("[SCENE] Tried to remove non-existent scene presence with agent ID {0} from scene Entities list", agentID);
                 }
+//                else
+//                {
+//                    m_log.InfoFormat("[SCENE] Removed scene presence {0} from entities list", agentID);
+//                }
             }
 
             lock (ScenePresences)
             {
-                if (ScenePresences.Remove(agentID))
+                if (!ScenePresences.Remove(agentID))
-                {
-                    //m_log.InfoFormat("[SCENE] Removed scene presence {0}", agentID);
-                }
-                else
                 {
                     m_log.WarnFormat("[SCENE] Tried to remove non-existent scene presence with agent ID {0} from scene ScenePresences list", agentID);                                        
                 }
+//                else
+//                {
+//                    m_log.InfoFormat("[SCENE] Removed scene presence {0} from scene presences list", agentID);
+//                }
             }
         }
 

OpenSim/Region/Environment/Scenes/Scene.cs

@@ -2259,6 +2259,7 @@ namespace OpenSim.Region.Environment.Scenes
             {
                 childagentYN = avatar.IsChildAgent;
             }
+            
             try
             {
                 m_log.DebugFormat(
@@ -2295,6 +2296,7 @@ namespace OpenSim.Region.Environment.Scenes
                 // We don't know which count to remove it from
                 // Avatar is already disposed :/
             }
+            
             m_eventManager.TriggerOnRemovePresence(agentID);
             Broadcast(delegate(IClientAPI client)
                       {
@@ -2631,6 +2633,7 @@ namespace OpenSim.Region.Environment.Scenes
                     {
                         m_innerScene.removeUserCount(true);
                     }
+                    
                     // Tell a single agent to disconnect from the region.
                     presence.ControllingClient.SendShutdownConnectionNotice();