Merge branch 'master' of git://scm.dev.nokia.troll.no/qt/qtbase-staging

Merge branch 'master' of git://scm.dev.nokia.troll.no/qt/qtbase-staging

* 'master' of git://scm.dev.nokia.troll.no/qt/qtbase-staging:
  Add internal documentation for QUnifiedToolbarSurface.
  Fix the autotest condition.
  Change the repaint() call to an update().
  Fix the update() autotest for raster.
  Change the repaint() to an update().
  Set the default graphics system to raster.
  Revert "Switch the default graphics system to raster on Mac."
  Fix an race condition in the auto test.
  Fix an race condition in the auto test.
  Fix a race condition when the main window is being destructed.
  Switch the default graphics system to raster on Mac.