[Regression] QTreeView::sortByColumn(-1, Qt::AscendingOrder) is ignored

Presumably since Qt 5.13.0, a QTreeView subclass that calls sortByColumn with -1 as parameter seems to have no effect. For some reason it now always adds a sorting indicator to the first column. This is a change in behavior compared to Qt 5.12.0 and before, previously it would maintain the natural sorting order.

The documentation explicitly permits -1 as column: https://doc.qt.io/qt-5/qtreeview.html#sortByColumn

The same application (Wireshark) has worked without issues before.

Most likely introduced via https://codereview.qt-project.org/c/qt/qtbase/+/243900

Downstream bug report: https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15979

CC chehrlic, srutledg, richard