Take a look at the cancel option from jquery-ui
$("#sortable").sortable(cancel: 'input');
You need to remove $("#sortable").disableSelection();
See my jsfiddle
UPDATE
I understand your problem. Since jQuery stops the default browser functionality when sorting the list, blurring is never called for this field. You will have to make the field blur.
jsfiddle. , , "change" "start", , .