title: android when i use moveTaskToBack(true) my app starts again from first activity
body: <p>my app has two activities .
  when user opens the app . 
  activity A is opens. 
  then user clicks on the button and activity B is opens .
  in activity B when user tuch a button </p>
  
  <pre><code>moveTaskToBack(true);
  </code></pre>
  
  <p>is run . and activity goes to background .</p>
  
  <p>my problem is After this event When the user clicks on the app icon . activity A is come 
  While it should be activity B</p>