Ah, I forgot. There is also QNanoPainter: https://github.com/QUItCoding/qnanopainter Haven't tried it myself, but I've heard a lot of good opinions about it.

@Rguessford I would also be interested to get the Qt Creator Debug button to work for both, Python and QML debugging, at the same time. Even with QQmlDebuggingEnabler instantiated.
I think, I'm stuck at the same as @Jeff-B-0

@Solan
It will not work in debug mode because in Debug mode there some extra initializations that happen behind the scenes. If you heavily use the pointers the visual debuggers won't help you out.
For more information on this topic read about -Wall option in gcc for linux and go to msdn about debugger from microsoft windows.
If the code you are writing from scratch then please use latest conventions of new and delete.