Add back parts of reverted changes that were not concerned with child agent caching.

This adds ScenePresence to IClientAPI.SceneAgent earlier on in the add client process so that its information is available to EventManager.OnNewClient() and OnClientLogin()
Also add a code comment as to why we're caching friend information for child agents.

1 files changed, 1 insertions, 1 deletions

diff --git a/OpenSim/Framework/IClientAPI.cs b/OpenSim/Framework/IClientAPI.cs
index 3f560d0..1e36b06 100644
--- a/OpenSim/Framework/IClientAPI.cs
+++ b/OpenSim/Framework/IClientAPI.cs
@@ -710,7 +710,7 @@ namespace OpenSim.Framework
         /// The scene agent for this client.  This will only be set if the client has an agent in a scene (i.e. if it
         /// is connected).
         /// </summary>
-        ISceneAgent SceneAgent { get; }
+        ISceneAgent SceneAgent { get; set; }
 
         UUID SessionId { get; }