title: Shared element transition with viewPager
body: <p>I have problem with <code>sharedElementTransitions</code>. I have one <code>activity</code> with <code>fragment</code> - from this <code>fragment</code> I start new <code>activity</code> with <code>sharedElementTransitions</code>, inside this <code>activity</code> I start <code>fragment</code> and inside this <code>fragment</code> is <code>viewPager</code>, now when I call <code>setTransitionName</code> in this <code>fragment</code> everything works very well, but when I move it to <code>fragment</code> that is inside my <code>viewPager</code> and call it inside <code>onCreateView</code> there is no smooth enter animation, back animation is working as intended. I was quite sure this might be resolved using <code>postponeEnterTransition</code>, so in my <code>activity</code> with <code>fragment</code> with <code>viewPager</code> I am calling <code>postponeEnterTransition()</code> and in my fragment  <code>getActivity().startPostponedEnterTransition()</code> but it is still not working... Any ideas what might go wrong?</p>