title: UICollectionView scrollToItemAtIndexPath doesn't work
body: <pre><code>[myCollectionView scrollToItemAtIndexPath:[NSIndexPath indexPathForRow:2 inSection:0] atScrollPosition:UICollectionViewScrollPositionLeft animated:YES];
  </code></pre>
  
  <p><code>myCollectionView</code> is not nil, and contains 3 items. I'm trying to scroll it programatically so that the 2nd item appears at the left edge of the collection view's frame.</p>
  
  <p>The collection view does not move at all. I've also tried <code>setContentOffset</code>, which also has no affect. What would be preventing the collection view from scrolling?</p>
  
  <p>EDIT: <code>setContentOffset</code> does actually work. I'd still be interested in knowing why <code>scrollToItemAtIndexPath</code> doesn't work though.</p>