Positive options are more intuitive and make for a better API.

Task-number: QTBUG-63179
Change-Id: I632ee768dba52554e7d37d9da84661a1d01f1f37
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>