Dear Maintainer,

In the default theme, QSortFilterProxyModel's arrows are backwards,
please consult attached screenshots of sample project
(https://www.walletfox.com/course/qsortfilterproxymodelexample.php).

I repro this on bookworm and sid, discovered downstream in
https://github.com/spesmilo/electrum/pull/9999

Best,

Looking over the electrum link, it would appear this is an upstream bug.  I am
going to look around upstream to see if it has already been reported, but if
not I will file a bug report.  However, if anyone has time to get to it before
I do, feel free to go ahead.