Text improperly scaled in QLineEdit wrapped in a QGraphicsProxyWidget when QGraphicsView is scaled

1) Create a QLineEdit.
2) Put it in a QGraphicsProxyWidget and include the proxy in a QGraphicsScene, or just call addWidget from the QGraphicsScene instance.
3) Create a QGraphicsView and set its scene to be the scene you have just created.
4) Now scale the view using: QGraphicsView::setScale(qreal sx, qreal sy).
5) Notice that on Windows and Linux the text looks good, but on Mac OS X it is displayed pixelated.

Windows and Linux:
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text: scaled (rasterized at actual resolution)
QLineEdit's border: magnified (pixelated)
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Mac OS X:
===========
text: magnified (pixelated)
QLineEdit's border: magnified (pixelated)
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A sample project is provided.