title: Kendo nested sortables not working
body: <p>I have three sortable lists. One of them is a grid, the other two just simple lists. The non-grid lists are nested in each other. My problem is, that I can't drag items to the nested sortable, however I can drag out from it.</p>
  
  <p>I made a fiddle from the official kendo example for nested lists: <a href="https://jsfiddle.net/9jnuwjjg/1/" rel="nofollow noreferrer">https://jsfiddle.net/9jnuwjjg/1/</a></p>
  
  <pre><code>$("#parent").kendoSortable({
    connectWith: "#nested, #third",
    filter: "&gt;li.list-item", 
    ignore: "#nested &gt;li", 
    placeholder: placeholder
  });
  
  $("#nested").kendoSortable({
    connectWith: "#parent, #third",
    filter: ".list-item",
    placeholder: placeholder
  });
  
  $("#third").kendoSortable({
    connectWith: "#parent, #nested",
    filter: ".list-item",
    placeholder: placeholder
  });
  </code></pre>
  
  <p>It has the same problem, I can't drag any item to the nested list.</p>
  
  <p>Any idea would be appreciated!<br>
  Thanks!</p>