title: SlickGrid selection issues on sort
body: <p>When using SlickGrids <code>selection</code> and <code>sorting</code> together I found that the selection is storing the index of the selected rows rather than storing the selection for the data you selected.</p>
  
  <p>How can I fix this so that the selected data is remembered instead of just an index?</p>
  
  <hr>
  
  <p>A demo of the issue can be found here:
  <a href="http://jsfiddle.net/blowsie/LKf6j/">http://jsfiddle.net/blowsie/LKf6j/</a></p>
  
  <blockquote>
    <p>To reproduce the issue take the following steps;</p>
    
    <ol>
    <li>Select the first item in the grid </li>
    <li>Sort on name</li>
    </ol>
  </blockquote>