Drag & Drop: Issues when used with the Zoom option.

[achristmann]

I tested this with the example code located at: http://dabeng.github.io/OrgChart/drag-drop/

The only modification I made to the example code was to add the zoom key to the initialization options.

-In IE 11, after zooming out, you can pick nodes up and move them around, but no dashed borders appear on other nodes, and if you drop the node which you have picked up onto another node, nothing happens.
-In Firefox 49, after zooming out, the drag and drop functionality works correctly, however there is no ghost node attached to your mouse pointer indicating that you have picked up a node. The ghost node works correctly if you do not zoom out.
-I have not yet tested any other browsers.

Thank you for your wonderful library.