QItemSelectionModel::columnIntersectsSelection() should honor the parent
according to the docs. For rowIntersectsSelection() this was fixed a
long time ago but columnIntersectsSelection() was forgotten.
Sync the both functions and use range-based for loops as a drive-by.
Fixes: QTBUG-80644
Change-Id: Iaf08f85e2225204d1e6564fa4bb0bc826352ed53
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
Reviewed-by: Richard Moe Gustavsen <richard.gustavsen@qt.io>