Merge branch '4.6' of git@scm.dev.nokia.troll.no:qt/oslo-staging-2 into 4.6-integration

* '4.6' of git@scm.dev.nokia.troll.no:qt/oslo-staging-2: (32 commits)
  Fixes visibility update missing when doing setParentItem on graphicsitem
  Stabilize tst_QGraphicsScene::polishItems2 (new test)
  Fixed an infinite loop that could occur when reading invalid BMP images.
  Updated docs regarding QGLWidget::renderText() limitations.
  Added optimization flag to QGraphicsItemPrivate.
  Fixed child items with graphics effects not inheriting opacity.
  Made the trace replayer handle limited resolution cases better.
  Small optimization in raster paint engine.
  Another ASSERT while deleting spans
  Implement QDirectFBPixmapData::scroll
  Potential crash when adding items from QGraphicsWidget::polishEvent().
  QGraphicsWidget is painted twice on the inital show.
  Fix QPainter::redirection() to pass autotest.
  Re-added the Close button in QPrintPreviewDialog for Mac/Carbon.
  revert parts of 10392eef4fd4f9
  Fix y-inverted pixmaps properly.
  Fix rendering with simple shader in GL2 engine
  removed a debug trace
  Fix documentation bug in QColor
  Don't use a mutex lock in QPainter::redirection unless strictly required
  ...

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