title: UITableViewCell layoutSubViews: why don't I get animation?
body: <p>I always thought that whatever changes I perform in <code>layoutSubViews:</code> is done animated?
  Is this incorrect information?
  In my case I'm inheriting from a <code>UITableViewCell</code>.
  The controller gets informed that the user wants to enlarge the cells, so I first use a <code>UITableView</code> animation block to increase row height. The height increases smoothly animated to the new height.</p>
  
  <p>Then I loop my visible cells, set a flag and call <code>setNeedsLayout:</code>
  The cells indeed layout and adust the content to the new height but without animation.</p>