What a detailed reply. Thank you! I was able to make it work.
I have some follow up questions:
Am I right to assume the accepted best practice for dragging is then to create an image, instead of dragging the actual widget? I see this in the drag drop tutorial in the docs.
If so, how do you handle the original image still in place on the UI? I mean if you try to create the illusion that the actual item is being dragged. I have tried to fade the widget out in the On Drag Detected override but it also fades out the copy, the image being dragged.