JQuery UI sorting in a scrolling div

This question is about non-horizontal scrolling. It's about using the jQuery UI function sortable

when it's in the horizontal scroll area.

I created a fiddle as a demo: http://jsfiddle.net/shhQuiet/t2vnfmh4/4/embedded/result/

I've tried something like this, to no avail:

$('#scroller').scroll(function() {
    $('.items').sortable("refreshPositions");
});

      

        
        
        
      

    

Here's how to do it:

Markup

<div id="scroller">
<div class="items">
    <div class="item">One</div>
    <div class="item">Two</div>
    <div class="item">Three</div>
    <div class="item">Four</div>
    <div class="item">Five</div>
    <div class="item">Six</div>
</div>
<div class="items">
    <div class="item">One</div>
    <div class="item">Two</div>
    <div class="item">Three</div>
    <div class="item">Four</div>
    <div class="item">Five</div>
    <div class="item">Six</div>
</div>
... removed some repetitions for brevity ...
</div>
</p>

      

        
        
        
      

    

Js

$('.items').sortable({
    axis: 'y',
    containment: 'parent'
});

      

        
        
        
      

    

CSS

.item {
    border: 1px #aaa solid;
    width: 2in;
}

.items {
    height: 100%;
    display: inline-block;
    overflow-y: auto;
    overflow-x: hidden;
}

#scroller {
    overflow-x: scroll;
    overflow-y: hidden;
    white-space: nowrap;
}