title: Multiple fragments, setRetainInstance(true) and screen rotation
body: <p>I'm switching between multiple fragments via replace. The fragments are also added to the back stack.</p>
  
  <p>Now I want that on orientation change the fragments aren't created again. I put <code>setRetainInstance(true)</code> on each of them.</p>
  
  <p>Fragment A behaves ok. Then I switch to fragment B, rotate the screen and see fragment A. What am I doing wrong? Or is this expected?</p>