Update all clients sitting on a linkset if a child prim is moved. This prevents avatars being "lost in the void" until they stand up when a child prim is moved that they're sitting on.

OpenSim/Region/Framework/Scenes/SceneObjectPart.cs

@@ -711,6 +711,12 @@ namespace OpenSim.Region.Framework.Scenes
                         // Tell the physics engines that this prim changed.
                         m_parentGroup.Scene.PhysicsScene.AddPhysicsActorTaint(actor);
                     }
+
+                    List<ScenePresence> avs = ParentGroup.GetLinkedAvatars();
+                    foreach (ScenePresence av in avs)
+                    {
+                        av.SendFullUpdateToAllClients();
+                    }
                 }
             }
         }