title: Eclipse JFace TreeViewer level auto expansion doesn't work
body: <p>According to the Eclipse documentation <code>TreeViewer.setAutoExpandLevel(3)</code> means that top-level elements are expanded, and their children, but not grandchildren.</p>
  
  <p>I used that in my code, but after setting the input the tree is not auto-expanded, neither on OS X nor on Linux. Expanding the tree manually (via mouse) works flawlessly. Am I missing anything?</p>