Dear Maintainer,


The version of PyQt5 in the Debian stretch archives seems to leak memory on
deference of a QStyleOptionTab.

I have created a simple python file to reproduce the issue:

		import resource
		from PyQt5.QtWidgets import QStyleOptionTab
		import tracemalloc

		before = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss
		print(before)

		opt = QStyleOptionTab()

		for i in range(10000000):
			a = opt.rect

		after = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss
		print(after)

		if after > before + 10000:
			print("you seem to be leaking memory?")
		else:
			print("you're probably fine...")

On a normal system, this snippet should print "you're probably fine...",
but on debian stable it prints "you seem to be leaking memory?".

This issue also affects fedora25.

Is it possible that a patch could be prepared for this, or is it too
late for that in stable now? I think this has been fixed in testing, but
I have not verified it.

Here is the original issue where I found and debugged the problem:
https://github.com/qutebrowser/qutebrowser/issues/3280

This currently affects:

- Debian Stable
- Ubuntu zesty
- Fedora 25

And curiously, the 5.7.1 PyQt5 on pypi does not suffer from this.

Please let me know if you need any additional information.

Hi Jay,

It would be nice to know which upstream change fixes this problem.

I checked the diff between 5.7 and 5.7.1 tarballs and could not find
anything related to QStyleOptionTab or mentioning memory leaks.

Unfortunately I do not have time to dig deeper.