Help testing unstable's qtbase

[Lisandro Damián Nicanor Pérez Meyer <perezmeyer@gmail.com>]

tl;dr: please update your unstable install and check if you see
something wrong (that wasn't there before) with Qt.

Hi! Some hours ago I've uploaded qtbase 5.15.2+dfsg-7 with a fix for
improper access to QGridLayout:

    https://salsa.debian.org/qt-kde-team/qt/qtbase/-/blob/master/debian/patches/fix-invalid-pointer-return-with-QGridLayout.diff

That's a perfectly valid patch and, in normal times, I would just
upload it and see if any app was somehow using this misfeature
wrongly. I really don't think they would be such a thing due to the
nature of the bug, but as we are in freeze I would really love if you
could update your unstable systems and give it a go.

So far I have not noticed anything weird. If nothing breaks I'll
certainly ask for an unblock so the patch makes it to bullseye.

Thanks for helping!!!

-- 
Lisandro Damián Nicanor Pérez Meyer
https://perezmeyer.com.ar/