don't auto return objects if they have sitting avatars (not npcs) - mantis 7828 with diferent code

OpenSim/Region/Framework/Scenes/SceneObjectGroup.cs

@@ -2225,6 +2225,20 @@ namespace OpenSim.Region.Framework.Scenes
                             if ((DateTime.UtcNow - RootPart.Rezzed).TotalMinutes >
                                     parcel.LandData.OtherCleanTime)
                             {
+                                // don't autoreturn if we have a sitting avatar
+                                // mantis 7828 (but none the provided patchs)
+
+                                if(GetSittingAvatarsCount() > 0)
+                                {
+                                    // do not respect npcs
+                                    List<ScenePresence> sitters = GetSittingAvatars();
+                                    foreach(ScenePresence sp in sitters)
+                                    {
+                                        if(!sp.IsDeleted && !sp.isNPC && sp.IsSatOnObject)
+                                            return;
+                                    }
+                                }
+
                                 DetachFromBackup();
                                 m_log.DebugFormat(
                                     "[SCENE OBJECT GROUP]: Returning object {0} due to parcel autoreturn",