title: ng-select2 dropdown still shows after clicking browser back button
body: <p>I am using an ng-select2 component here</p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>  &lt;ng-select2 id="supportTicketFilter" class="support-ticket-filter" width="370" [data]="filterValues"
              [options]="options" (valueChanged)="filterTable($event)" name="searchBar" data-selected="selected"&gt;
  &lt;/ng-select2&gt;</code></pre>
  </div>
  </div>
  
  The issue is that when the drop down is selected as seen below<a href="https://i.stack.imgur.com/O3lsH.png" rel="nofollow noreferrer">enter image description here</a></p>
  
  <p>and you click the back button on the browser, the dropdown menu still appears on the next page.</p>
  
  <p><a href="https://i.stack.imgur.com/AtyTM.png" rel="nofollow noreferrer">enter image description here</a></p>
  
  <p>Has anyone run into this issue before?
  The only thing I can think of now is to listen for the back button on the browser and then try to toggle something in the ng-select2.</p>