title: Qt stylesheet of dock area splitter
body: <p>How to change the style sheet of splitter/handle beside QDockWidget when it is added to DockWidgetArea. There is one main movable handle and multiple handles between each dockwidgets on that side. I would like to change at least bg colour and border of the handle and hover colour.</p>
  
  <p>It would help if I know what kind of object it is or to get some pointer to the handle to setStyleSheet on it.</p>