Following on from 476a7d3e (which wasn't enough), make chat across regions on different simulators work.

Also resolves an issue of multiple chatting if the originating simulators had more than one region and they were neighbours

OpenSim/Region/CoreModules/Avatar/Chat/ChatModule.cs

@@ -48,7 +48,6 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
         private int m_saydistance = 20;
         private int m_shoutdistance = 100;
         private int m_whisperdistance = 10;
-        private List<Scene> m_scenes = new List<Scene>();
 
         internal object m_syncy = new object();
 
@@ -80,18 +79,12 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
 
         public virtual void AddRegion(Scene scene)
         {
-            if (!m_enabled) return;
+            if (!m_enabled) 
+                return;
 
-            lock (m_syncy)
-            {
-                if (!m_scenes.Contains(scene))
-                {
-                    m_scenes.Add(scene);
             scene.EventManager.OnNewClient += OnNewClient;
             scene.EventManager.OnChatFromWorld += OnChatFromWorld;
             scene.EventManager.OnChatBroadcast += OnChatBroadcast;
-                }
-            }
 
             m_log.InfoFormat("[CHAT]: Initialized for {0} w:{1} s:{2} S:{3}", scene.RegionInfo.RegionName,
                              m_whisperdistance, m_saydistance, m_shoutdistance);
@@ -103,18 +96,12 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
 
         public virtual void RemoveRegion(Scene scene)
         {
-            if (!m_enabled) return;
+            if (!m_enabled) 
+                return;
 
-            lock (m_syncy)
-            {
-                if (m_scenes.Contains(scene))
-                {
             scene.EventManager.OnNewClient -= OnNewClient;
             scene.EventManager.OnChatFromWorld -= OnChatFromWorld;
             scene.EventManager.OnChatBroadcast -= OnChatBroadcast;
-                    m_scenes.Remove(scene);
-                }
-            }
         }
         
         public virtual void Close()
@@ -189,7 +176,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
             UUID ownerID = UUID.Zero;
             UUID targetID = c.TargetUUID;
             string message = c.Message;
-            IScene scene = c.Scene;
+            Scene scene = (Scene)c.Scene;
             Vector3 fromPos = c.Position;
             Vector3 regionPos = new Vector3(scene.RegionInfo.RegionLocX * Constants.RegionSize,
                                             scene.RegionInfo.RegionLocY * Constants.RegionSize, 0);
@@ -199,13 +186,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
             switch (sourceType) 
             {
             case ChatSourceType.Agent:
-                if (!(scene is Scene))
+                ScenePresence avatar = scene.GetScenePresence(c.Sender.AgentId);
-                {
-                    m_log.WarnFormat("[CHAT]: scene {0} is not a Scene object, cannot obtain scene presence for {1}",
-                                     scene.RegionInfo.RegionName, c.Sender.AgentId);
-                    return;
-                }
-                ScenePresence avatar = (scene as Scene).GetScenePresence(c.Sender.AgentId);
                 fromPos = avatar.AbsolutePosition;
                 fromName = avatar.Name;
                 fromID = c.Sender.AgentId;
@@ -232,13 +213,11 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
 
             HashSet<UUID> receiverIDs = new HashSet<UUID>();
 
-            foreach (Scene s in m_scenes)
-            {
             if (targetID == UUID.Zero)
             {
                 // This should use ForEachClient, but clients don't have a position.
                 // If camera is moved into client, then camera position can be used
-                    s.ForEachScenePresence(
+                scene.ForEachScenePresence(
                     delegate(ScenePresence presence)
                     {
                         if (TrySendChatMessage(
@@ -251,7 +230,7 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
             {
                 // This is a send to a specific client eg from llRegionSayTo
                 // no need to check distance etc, jand send is as say
-                    ScenePresence presence = s.GetScenePresence(targetID);
+                ScenePresence presence = scene.GetScenePresence(targetID);
                 if (presence != null && !presence.IsChildAgent)
                 {
                     if (TrySendChatMessage(
@@ -259,9 +238,8 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
                         receiverIDs.Add(presence.UUID);
                 }
             }
-            }
 
-            (scene as Scene).EventManager.TriggerOnChatToClients(
+            scene.EventManager.TriggerOnChatToClients(
                 fromID, receiverIDs, message, c.Type, fromPos, fromName, sourceType, ChatAudibleLevel.Fully);
         }
 
@@ -346,9 +324,6 @@ namespace OpenSim.Region.CoreModules.Avatar.Chat
             UUID fromAgentID, UUID ownerID, string fromName, ChatTypeEnum type,
             string message, ChatSourceType src, bool ignoreDistance)
         {
-            // don't send stuff to child agents
-            if (presence.IsChildAgent) return false;
-
             Vector3 fromRegionPos = fromPos + regionPos;
             Vector3 toRegionPos = presence.AbsolutePosition +
                 new Vector3(presence.Scene.RegionInfo.RegionLocX * Constants.RegionSize,