title: XMLHttpRequest() .responseText not returning full data
body: <p>I am using XMLHttpRequest() to get xml data from a webpage and use it in a XmlListModel. The problem that I got seems to be that XmlListModel only gets a small portion of the data as .responseText using <code>console.log(httpReq.responseText)</code> only gives me a partial xml data around 20% of what's inside the xml. </p>
  
  <p>The other issue is that XmlListModel is always behind one call, when I first call the function it says fullscreen is undefined but when I call it again it's fine. BUT this function needs to be called ever 1 second to get updated data as the xml file is always changing but only ever second call gives me right data.</p>
  
  <p>The function looks like this: </p>
  
  <pre><code>XmlListModel{
      id: xmlModel
      query: "/root"
      XmlRole{ name: "fullscreen"; query: "fullscreen/string()"}
      XmlRole{ name: "volume"; query: "volume/string()"}
      XmlRole{ name: "random"; query: "random/string()"}
      XmlRole{ name: "state"; query: "state/string()"}
      XmlRole{ name: "loop"; query: "loop/string()"}
      XmlRole{ name: "repeat"; query: "repeat/string()"}
  }
  
  function getVLCstatus()
  {
      var httpReq = new XMLHttpRequest()
      var url = "http://" + ip + ":" + port + "/requests/status.xml";
  
      httpReq.open("GET", url, true);
      // Send the proper header information along with the request
      httpReq.setRequestHeader("Authorization", "Basic " + Qt.btoa(username + ":" + password));
      httpReq.setRequestHeader('Content-Type',  'text/xml');
      httpReq.onreadystatechange = function()
      {
          if(httpReq.readyState === XMLHttpRequest.DONE)
          {
              if(httpReq.status == 200)
              {
                  xmlModel.xml = httpReq.responseText
                  console.log(xmlModel.get(0).fullscreen)
              }
          }
      }
      httpReq.send();
  }
  </code></pre>
  
  <p>Am I doing something wrong?</p>