OpenSim.Region.CoreModules.World.Voxels.VoxelModule.StoreUndoState C# (CSharp) Method

        private void StoreUndoState()
        {
            lock (m_undo)
            {
                if (m_undo.Count > 0)
                {
                    VoxelUndoState last = m_undo.Peek();
                    if (last != null)
                    {
                        if (last.Compare(m_channel))
                            return;
                    }
                }

                VoxelUndoState nUndo = new VoxelUndoState(this, m_channel);
                m_undo.Push(nUndo);
            }
        }