title: Parallel add and displaced transitions in ListView
body: <p>In ListView when I add new item with long add transition inserting new items before that item cause displace of that item and stop its add transition processing. How can I workaround this?</p>
  
  <pre><code>import QtQuick 2.0
  import QtQuick.Controls 1.0
  
  Item
  {
      width: 500
      height: 500
  
      property ListModel model: ListModel {}
  
      Button
      {
          id: button
          text: "insert: " + model.count
  
          onClicked:
          {
              model.insert(Math.round(Math.random() * model.count), {"name": model.count});
          }
      }
  
      ListView
      {
          model: parent.model
          anchors.top: button.bottom
          anchors.left: parent.left
          anchors.right: parent.right
          anchors.bottom: parent.bottom
  
          delegate: Text {
              text: name
          }
  
          add: Transition {
              NumberAnimation { properties: "opacity"; from: 0.0; to: 1.0; duration: 1000 }
          }
      }
  }
  </code></pre>