title: Jquery datepicker change event trigger and input's default change event
body: <p>I have datepicker</p>
  
  <pre><code>  &lt;input type='text' class='inp'&gt;  
  &lt;script&gt;
     $('.inp').datepicker();
  
    $(".inp").on("change",function (){ 
     console.log('inp changed');
    });
  &lt;/script&gt;
  </code></pre>
  
  <p>When I first change '.inp' manually type there a value, then immediately I click on datepicker's opened calendar. I get two 'change' event listeners. First from manual change, then from datepicker change.
  How can I avoid this?</p>