Dynamo.Graph.Workspaces.WorkspaceModel.Undo C# (CSharp) Method

        internal void Undo()
        {
            if (null != undoRecorder)
            {
                undoRecorder.Undo();

                // http://adsk-oss.myjetbrains.com/youtrack/issue/MAGN-7883
                // Request run for every undo action
                RequestRun();
            }
        }