Weird QProxyStyle TypeError on Python 3.12

[Florian Bruhin]

Hey,

With CPython 3.12.0rc1 and PyQt 6.5.2 on Fedora 39 Beta 1.1, it looks
like it's impossible to create a QProxyStyle with no arguments.

A "docker run -it fedora:39" followed by:

    dnf install python-pyqt6
    python3 -c 'from PyQt6.QtWidgets import QProxyStyle; s = QProxyStyle()'

Results in:

    TypeError: arguments did not match any overloaded call:
      QProxyStyle(style: typing.Optional[QStyle] = None): not enough arguments
      QProxyStyle(key: Optional[str]): not enough arguments

Using QProxyStyle(None) seems to work as a workaround.

For some reason, I can *not* reproduce this right now on Archlinux with
Python 3.12.0rc2 (but Python 3.12.0rc3 on Fedora also reproduces it,
*and* I've seen this exact error on Archlinux earlier this week, so not
sure yet what triggers it).

Florian
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