Request help for draging animation, animate the items before and after the placeholder

Hi Johnny,

Thanks for providing this plugin, it is really useful in our project.

Currently when dragging an item, placeholder is moved among the rest of items, looks like the placeholder is jumping from one position to another.

Is it possible to animate the movement of the placeholder? Can this be done by customizing the onDrag() function? I'm with a non-nested, vertical list.

Please give suggestion, thanks.

-Sean