The undo manager does not record the resizing of nodes via ResizeToFitText(FitSize.KeepRatio) automatically.

If you use a ChangeItemCmd based on the modified node it will be recorded, but subsequent changings on connected links will be not registered. These changings are done by resize method.

However, undo calls will result in inconsistent charts (links are displayed unconnected or ends up anywhere in the chart due to the different origin/destination node size).

How can I handle this?

No, sorry, it doesn't work.

We did a couple of tests. It is remarkable that the problem will not occur, if you define an anchor pattern (DiagramNode.AnchorPattern).
Otherwise, links are displayed broken after undo action, although ChangeItemCmds for the resized node and also for links created and added to a composite command.

Diagram settings:

	this.diagram.AllowLinksRepeat = false;
	this.diagram.AllowSelfLoops = false;
	this.diagram.AllowSplitLinks = true;
	this.diagram.AutoResize = MindFusion.Diagramming.AutoResize.AllDirections;
	this.diagram.BackBrush = new MindFusion.Drawing.SolidBrush("#FFFFFFFF");
	this.diagram.DynamicLinks = true;
	this.diagram.HitTestPriority = MindFusion.Diagramming.HitTestPriority.ZOrder;
	this.diagram.LinkBrush = new MindFusion.Drawing.SolidBrush("#FF000000");
	this.diagram.LinkHeadShape = MindFusion.Diagramming.ArrowHead.Triangle;
	this.diagram.LinkHeadShapeSize = 2.5F;
	this.diagram.LinksSnapToBorders = true;
	this.diagram.LinkTextStyle = MindFusion.Diagramming.LinkTextStyle.OverLongestSegment;
	this.diagram.MergeThreshold = 1F;
	this.diagram.RestrictItemsToBounds = MindFusion.Diagramming.RestrictToBounds.InsideOnly;
	this.diagram.RoundRectFactor = 0.35F;
	this.diagram.SelectedItemHandlesColor = System.Drawing.Color.White;
	this.diagram.ShadowColor = System.Drawing.Color.LightGray;
	this.diagram.ShapeBrush = new MindFusion.Drawing.SolidBrush("#FFFFFFFF");
	this.diagram.ShapeHandlesStyle = MindFusion.Diagramming.HandlesStyle.SquareHandles2;
	this.diagram.ShapeText = "person";
	this.diagram.ShowDisabledHandles = false;
	this.diagram.SnapToAnchor = MindFusion.Diagramming.SnapToAnchor.OnCreateOrModify;