title: jQuery Draggable + Sortable - How to reject a drop into the sort?
body: <p>I have a sortable list of videos and a draggable set of videos. Basically I want to make sure that the videos dragged in are not in the first 5 minutes of video. As the video lengths vary I want to test this on the drop - add up the time up to then and if not 5mins revert and show an error.</p>
  
  <p>I have tried hooking into all of the callbacks for draggable and sortable (including the undocumented revert callback) to do my test but whatever I try, the dom always gets changed (and sortable calls its update callback)...</p>
  
  <p>Does anyone have any suggestions?</p>