Due to the deprecation warning for sortByColumn(int column) i was shocked to notice that sortByColumn(-1, Qt::AscendingOrder) doesn’t restore the natural order of my model anymore – the call seems to be ignored completely.

While trying to workaround that, i noticed that setSortingEnabled(false); also doesn’t reset to an unsorted state either. However it disabled the sort indicators and seems to set setSectionsClickable(false) which prevents any QHeaderView::sectionClicked signals from getting triggered.

It continues to sort new data even when the complete model is reset.

I implemented this manually using QHeaderView::sortIndicatorChanged, which is completely broken and potentially unfixable now.