title: QSplitter: How to make second column smaller?
body: <p>In QtCreator I created a QSplitter which separates vertically a QTreeWidget from a vertical layout with many things on the right.</p>
  
  <p>I would like that this second column by default takes the minimum space it needs to maximise the first one.</p>
  
  <p>I tried setting sizes and vertical policy of the splitter as expanding but surely I'm not doing it right. How can I set this exactly?</p>