If you try to add e.g. a QSpinBox or QCheckBox to a StyledBar, it will look out-of-place as the ManhattenStyle::drawControl does not overload CE_CheckBox or CE_SpinBox among others, while it does it for QComboBox, QLabel and others.

This can result in quite unreadable / ugly painting, see attached screenshots. Especially the checkbox on Mac is a big issue.