[Bug 1874096]

[Alvin-l]

In my understanding, it is not so much of the random destruction order
or QObject's, but that all QObject's in Python has to be destructed
before QCoreApplication. PyQt already solved it if the QCoreApplication
is created from the Python side, by ensuring all QObject's destruction
before QCoreApplication. but since in our case QCoreApplication is not
created from Python, their solution doesn't do anything for us.

In our case, the KritaPyQtPlugin destructor (and thus PyKrita::finalize)
is called during the destructor of QCoreApplication, which might be
triggering UB? So I wonder if the proper way to clean up is to call
PyKrita::finalize earlier, perhaps we can use the
QCoreApplication::aboutToQuit signal?

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https://bugs.launchpad.net/bugs/1874096

Title:
  Closing Krita normally always result in "Krita closed unexpectedly"
  notification on Plasma

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