title: tableHeaderView preserves state when popping viewController except ContainerViewController
body: <p>I have a tableViewController with a tableHeaderView.  When I'm at the top of the tableView and I scroll the tableView up slightly the tableHeaderView is hidden and can reappear again by scrolling down slightly.  This is the default behaviour.</p>
  
  <p>When I push to a viewController then pop back to the tableViewController, the state of the tableHeaderView is preserved.  i.e., if it was hidden it remains hidden and if it was visible it remains visible.</p>
  
  <p>However, for some reason when I push to another viewController that has a containerView and then pop back, the tableHeaderView always displays.  Even if it was hidden before pushing.   </p>