Python 3.12 segfault with mixin classes

[Florian Bruhin]

Hey,

> On 15/06/2023 19:03, Florian Bruhin wrote:
> > [...]
> > 
> > And that indeed seems to be the case: trawl_type does
> > "dict = sipPyTypeDict(pytype);", that is an alias to sip's
> > api_py_type_dict, and that accesses py_type->tp_dict.
> > 
> > See:
> > https://github.com/python/cpython/issues/105227
> > 
> > There is now an open PR to add a PyType_GetDict():
> > https://github.com/python/cpython/pull/105747
> 
> Hopefully fixed in tonight's snapshot - although it needs the next beta 
> release of Python v3.12 to build.

Unfortunately so far, that PR is not merged yet.

This also breaks the current snapshot wheel, so I cannot test if the
fix for the other bug (segfault on exit) works:

    ImportError: .../python3.12/site-packages/PyQt6/sip.cpython-312-x86_64-linux-gnu.so:
    undefined symbol: PyType_GetDict

Florian
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