Viewport Feature Support Drag and Drop when Fancy tree list is Long

[eelinVS]

I refer https://wwwendt.de/tech/fancytree/demo/index.html#sample-ext-grid.html to create a fancy tree using viewport feature.

In this fancy tree, I would like to drag and drop within the viewport (for example drag 1.1.1 to below 1.2).
I CANNOT drag to a destination (where need to scroll down) which is currently not in viewable range in viewport as shown in the picture below.
Currently, I can scroll down, but only allow to drag and drop at range of 1 - 1.1.12 as shown in the picture
May I know is this a limitation of using viewport? Is there any other solutions/suggestions to allow me to drag and drop (while scrolling)?

[mar10]

This seems to be a bug in the grid plugin.
It only has 'experimental' status, so it will not be fixed (unless someone contributes a PR), sorry.
Maybe switching to Wunderbaum is an option (even though it is still beta, and autoscroll is currently broken there as well. However it will be fixed there)