title: How to figure out the preferred size of a JFace TreeViewer or SWT Tree?
body: <p>I am writing an Eclipse plugin which has a hover control that consists of two controls, one on top of another:</p>
  
  <p>An HTML viewer (BrowserInformationControl) for which I Can easily compute the size hint</p>
  
  <p>A TreeViewer that contains a Tree.</p>
  
  <p>I have set up my tree with actual contents. However, I can't find a way to figure out the size of the tree or the size hint for it once rendered.</p>