title: android fragment popBackStack without POP_BACK_STACK_INCLUSIVE
body: <p>I have a deep, nested, fragment application.
  When I use the below code all works.</p>
  
  <pre><code>fragmentManager.popBackStack("root", FragmentManager.POP_BACK_STACK_INCLUSIVE);
  </code></pre>
  
  <p>However I want to keep the root fragment so I call</p>
  
  <pre><code>fragmentManager.popBackStack("root", 0);
  </code></pre>
  
  <p>But it doens't work, the Stack is the same.
  I'm sure that "root" is present because when I use the first code all is done in the right way.</p>