Drag and drop event ckeditor

I am also investigating this,
I was able to disable drag and drop *within* the editor by using an on 'dragstart' and the doing preventDefault(true) on this event.

However when I drag from outside the browser into ckeditor not only can I not detect it but the dataprocessor seems to be ignored. I am on Chrome at the moment.

I found this 5 year old discussion on the topic:
viewtopic.php?f=5&t=6155
and this 5 year old ticket:
http://dev.ckeditor.com/ticket/338

But I sure don't find any of that code in ckeditor's source now. I am wondering if this is something I just need to use an external library like jquery to handle?

CKEDITOR.on('instanceReady', function (ev) {
   // Prevent drag-and-drop.
   ev.editor.document.on('drop', function (ev) {
      ev.data.preventDefault(true);
   });
});

var dragstart_outside = true;
ev.editor.document.on('dragstart', function (ev) {
   dragstart_outside = false;
});
ev.editor.document.on('drop', function (ev) {
   if (dragstart_outside) {
      ev.data.preventDefault(true);
   }
   dragstart_outside = true;
});

Between 'instanceReady' and 'drop', you need to add 'contentDom'...Something like this:

CKEDITOR.on('instanceCreated', function(ev) {
        ev.editor.on('contentDom', function() {
            ev.editor.document.on('drop', function(ev) {
               ev.data.preventDefault(true); 
            }
        );
    });
}); 

CKEDITOR.plugins.add('myplugin',
        {
        init: function (editor) {

            function onDragStart(event) {                 
                console.log("onDragStart");
            };

            editor.on('contentDom', function (e) {                
                editor.document.on('dragstart', onDragStart);
                // editor.document.on('drop', onDrop);
                // etc.
            });
        }
});

If this thread is still relevant, this worked in a plugin...