private void OnDiagramNodeSizeChanged(IDiagramNode diagramNode, Size2D newSize)
 {
     if (newSize.IsDefined)
     {
         DiagramNodeSizeChanged?.Invoke(diagramNode, newSize);
     }
 }
 private void OnDiagramNodeSizeChanged(IDiagramNode diagramNode, Size2D newSize) => DiagramNodeSizeChanged?.Invoke(diagramNode, newSize);