title: AngularJS: ng-selected doesn't show selected value
body: <p>As on the title my select doesn't seem able to show the selected value, that is for instance, correctly selected...</p>
  
  <pre><code>&lt;md-input-container flex&gt;
      &lt;label&gt;Anno selezione&lt;/label&gt;
      &lt;md-select name="annoSelect" ng-model="vm.anno_attuale"
                 ng-value="vm.progetto.pprs[$index].anno"
                 ng-selected="item.selected" &gt;
           &lt;md-option ng-repeat="item in vm.progetto.pprs" &gt;
             {{vm.progetto.pprs[$index].anno}}
           &lt;/md-option&gt;
      &lt;/md-select&gt; 
  &lt;/md-input-container&gt;
  </code></pre>
  
  <p>I tried with some solutions found on stack, such as that one:
  <a href="https://stackoverflow.com/questions/41796338/angular-ng-select-does-not-show-ng-selected-value">Angular : ng-select does not show ng-selected value</a></p>
  
  <p>but any of them didn't fix the issue...
  Any idea?</p>