QTreeView allowed to set the sort column to -1 which shows the data in
it's natural order (when the model supports it). This functionality was
removed during the porting away from the deprecated sortByColumn(int)
functionality done in d0f909f8db
Readd the functionality and also allow it for QTableView.
Fixes: QTBUG-77419
Change-Id: I96b0c09ab9da36ca0a9de58fe0f37e2c56b1d51b
Reviewed-by: Samuel Gaist <samuel.gaist@idiap.ch>
Reviewed-by: David Faure <david.faure@kdab.com>
de26ea6a7f