private void DoLayout(IDiagram diagram)
{
var nodes = diagram.Nodes.Where(i => !i.HasParent).ToArray();
var connectors = nodes.SelectMany(i => diagram.GetConnectorsByNode(i.Id)).Distinct();
var oldRects = GetRects(nodes);
var newRects = _layoutAlgorithm.Calculate(nodes, connectors);
var changedRects = GetChanges(oldRects, newRects);
Debug.WriteLine($"ChangedRects.Count={changedRects.Count}");
ApplyChanges(changedRects, diagram);
}
