The decision whether to create a derived meta object class parsed from the Python type in MetaObjectBuilder was based on comparing the class name to the base meta object (the Python parsing must not be done when creating a meta object for a plain wrapped Qt type). This led to mixups when base class names were identical which is possible in Python. To fix this, split apart the code path not requiring Python type parsing (called from the wrapper code when initializing wrapped Qt classes) and expand the code for Python derived classes into initQObjectSubType(). Fixes: PYSIDE-3201 Pick-to: 6.10 Change-Id: Id62e7dc9b8af16154b161cdbf5dd0d460c55f6f1 Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>