In my project, users drag and drop TemplatedNodes from an ItemsControl, which I initiate by calling these lines of code:
var dn = new DraggedNode() { Node = node };
DragDrop.DoDragDrop(this, dn, DragDropEffects.Copy);

In Diagramming 3.5, the user would drop the node on the Diagram, and in the NodeCreated event I would see e.Node.Bounds.TopLeft would be set to where the mouse was when the node was dropped.
But now in Diagramming 4.1, e.Node.Bounds.TopLeft is always [0,0] regardless of where the mouse pointer is.

Also, in Diagramming 4.1, there is now a drag adorner that follows the mouse pointer around. Is there a way to either disable the adorner, or perhaps is there an event I can handle that lets me draw the adorner myself?

Thanks!

I don't think I have access to DraggedNode in the NodeCreated event handler, as the Drop event is handled by the internal Diagram code.

I dug into your source code though, and I realized I had to change the DraggedNode I pass in to DoDragDrop to:
var dn = new DraggedNode() { Node = node, Size = node.Bounds.Size };
because the OnDrop code in Diagram.cs won't assign the cloned node's Bounds unless the passed in Size is greater than zero.

Regarding the drag adorner: if I'm in the middle of drag-and-dropping a new node over the diagram and I happen to mouse over a node that is already on the diagram, OnTemplateChanged continually gets called as the mouse is over the existing node. And perhaps my templates are quite complex, because the rendering of the drag adorner hiccups and the adorner will flash or pause.  But perhaps I'll try what you suggested of showing a different template when Parent is null, and keep that template super simple.

Thanks!