QThread::terminate() leaks resources when called from currentThread()

The unix implementation of terminate() supports self-cancellation (albeit with QTBUG-127008), and the Windows implementation at least doesn't reject the call.

But on Windows TerminateThread(self) does not return anymore, meaning the following finish() call in QThread::terminate() never gets executed.

Can we fix the cleanup to happen before running the thread into the ground with TerminateThread()?

References:

• https://stackoverflow.com/a/78724369/134841