QFont::setWeights/QFont::setStyleNames

If a semibold variant of the font is needed, it's possible to request with setWeight(QFont::DemiBold) or setStyleName("Semibold"). There's a problem though that if the main font doesn't contain a glyph, Qt will try to find a fallback font and that font may not have Semibold style. It would be nice to have ability to set a list of preferred weights/style names so Qt would fallback to e.g. bold weight if semibold weight is not available.