title: QML ComboBox item does not display correct text
body: <p>The combobox seems to have a problem with certain characters, at least i've detected that when we go to the item list the "&amp;" appears as "_".
  How can we solve this?</p>
  
  <p>An example:</p>
  
  <pre><code>ComboBox {
      id: combobox
      textRole: "text"
      Layout.fillWidth: true
  
      model: ListModel {
          dynamicRoles: true
      }
  
      Component.onCompleted: {
          reload()
      }
  
      Connections {
          target: trans // this is a translator from a git project you are referring to
          onLanguageChanged: {
              combobox.reload()
          }
      }
  
      function reload() {
          var i = combobox.currentIndex
          combobox.model = [
                      {text: qsTr("apple &amp; orange")}
                  ]
          combobox.currentIndex = i
      }
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/0VdQ6.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/0VdQ6.png" alt="enter image description here"></a></p>
  
  <p>this is on QT 5.11.2</p>
  
  <p>If i escape the text
  <code>{text: qsTr("apple &amp;&amp; orange")}</code></p>
  
  <p>this happens</p>
  
  <p><a href="https://i.stack.imgur.com/XAP6D.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/XAP6D.png" alt="enter image description here"></a></p>