title: Sortable & droppable, droppable are doesn't update, when DOM does?
body: <p>I'm making a UI that involves sortables, in which there are droppable list items. Here's a fiddle of it:</p>
  
  <p><a href="http://jsfiddle.net/NRkwx/">http://jsfiddle.net/NRkwx/</a></p>
  
  <p>The problem is this: when you start sorting, and move the list item around, the droppables move too, but <em>the area</em> that they are droppable to doesn't. You can see it by moving some list items. You'll notice, that if e.g. the droppable moves one step up, you can drop to it from its original position, not from where it actually resides.</p>
  
  <p>How could I update the droppable area? Should I remove the droppable and add it on <code>sortable change</code>?</p>