Ready for removal at Qt 6, as advocated in a ### comment.
It was never done consistently with operator==(), apparently, and
should not be needed in any case.
[ChangeLog][QtCore][QItemSelectionRange] Ordering of
QItemSelectionRange is now deprecated. It was not consistent with
equality and should not be needed.
Task-number: QTBUG-85700
Pick-to: 5.15 5.15.2
Change-Id: Ie99294bd7fc18f2a497598ae08840886b0a6d62d
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
29c113d912