Make the iframe scrollable during DnD

[rafasashi]

I have noticed that the iframe is not scrollable during the element dragging.

I am working on a project where the user must be able to scroll down the iframe to drop anywhere.

The Droppable demo from jqueryui.com works :
https://jqueryui.com/droppable/

I guess its because the list of elements is located in the parent document as opposed to the jqueryui demo where the draggable element is located in the same document as the drop zone.

I d'like to solve this issue implementing this answer:

https://stackoverflow.com/questions/7279477/how-to-make-iframe-listen-to-scroll-events-as-parent-when-click-event-within-par

Could you please put me on the path?

Once again thank you for this interface!