Add a method to delete left over / dropped attachments

OpenSim/Region/Framework/Scenes/Scene.cs

@@ -5040,5 +5040,37 @@ namespace OpenSim.Region.Framework.Scenes
                     throw new Exception(error);
             }
         }
+
+        public void CleanDroppedAttachments()
+        {
+            List<SceneObjectGroup> objectsToDelete =
+                    new List<SceneObjectGroup>();
+
+            ForEachSOG(delegate (SceneObjectGroup grp)
+                    {
+                        if (grp.RootPart.Shape.State != 0)
+                        {
+                            UUID agentID = grp.OwnerID;
+                            if (agentID == UUID.Zero)
+                            {
+                                objectsToDelete.Add(grp);
+                                return;
+                            }
+
+                            ScenePresence sp = GetScenePresence(agentID);
+                            if (sp == null)
+                            {
+                                objectsToDelete.Add(grp);
+                                return;
+                            }
+                        }
+                    });
+            
+            foreach (SceneObjectGroup grp in objectsToDelete)
+            {
+                m_log.InfoFormat("[SCENE]: Deleting dropped attachment {0} of user {1}", grp.UUID, grp.OwnerID);
+                DeleteSceneObject(grp, true);
+            }
+        }
     }
 }