QQuickPaintedItem rotated font rendering is ugly with FramebufferObject render target

I have a QQuickPaintedItem that draws some normal and rotated text with QPainter. The default font and settings are used. Antaliasing is turned on with QQuickPainterItem::setAntialiasing(true).

It works fine unless I have `setRenderTarget(QQuickPainterItem::FramebufferObject)` in which case the rotated text looks super-ugly.

I would have assumed it would use the Valve-style distance field text rendering technique, but it seems like it is actually just rendering the text with no antialiasing to a texture and then rotating that with bilinear filtering. The attached image shows the text with (top) and without (bottom) a FBO target.