title: Sortable sorting item from one sortable to another not working
body: <p>I trying to move item from one <code>Sortable</code> list to other one but item is not move cause of parent scroll. 
  Below snippet example of my code.</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-js lang-js prettyprint-override"><code>$(".dragable .item").draggable({
                      revert: "invalid",
                      helper:'clone',
                      appendTo: '.main_container',
                      connectToSortable: '.contianer .sortable',
                      drag: function(event, ui) {
                          //cursor position adjustment
                          $(this).draggable('instance').offset.click = {
                              left: Math.floor(ui.helper.width() / 2),
                              top: Math.floor(ui.helper.height() / 2)
                          }
                      },
                  })
  
                  $('.contianer .sortable').sortable({
                        connectWith: ".sortable",
                        over: function(event, ui) {
                    },
  
                  });</code></pre>
  <pre class="snippet-code-css lang-css prettyprint-override"><code>.sortable{
    background: gray;
    height: 750px;
    margin-bottom: 20px;
  
  }
  .dragable{
    float: left;
  }
  .main_container,body,html{
    overflow: hidden;
    height: 100%;
  }
  .main_container{
    position: absolute;
    width: 100%;
    
  }
  .contianer{
    overflow: auto;
    width: 300px;
    padding:0 5px;
       height: calc(100% - 57px);
      float: left;
  
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"&gt;&lt;/script&gt;
  &lt;script src="https://code.jquery.com/ui/1.12.1/jquery-ui.min.js"&gt;&lt;/script&gt;
  
  &lt;div class="main_container"&gt;
    &lt;p&gt;Item move from List 1 to List 2 is not working. List two is downside scroll&lt;/p&gt;
    &lt;div class="contianer"&gt;
      &lt;h3&gt;Sortable List 1&lt;/h3&gt;
      &lt;div class="sortable1 sortable"&gt;&lt;/div&gt;
       &lt;h3&gt;Sortable List 2&lt;/h3&gt;
      &lt;div class="sortable2 sortable"&gt;&lt;/div&gt;
    &lt;/div&gt;
  
    
    &lt;div class="dragable"&gt;
        &lt;li class="item"&gt;test1&lt;/li&gt;
        &lt;li class="item"&gt;test2&lt;/li&gt;
        &lt;li class="item"&gt;test3&lt;/li&gt;
    &lt;/div&gt;
  
   
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>