A few examples seem to have copied and pasted a help action "About
&Qt" that triggered QCoreApplication::quit. This does not look like
best practice. Use QApplication::aboutQt instead.
Task-number: QTBUG-111228
Change-Id: I1887a3c999d752a24c7c4d3cabc4a5d63b29b966
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
(cherry picked from commit 3ccf2f8308ba33cab575c22ad2e246b987a3dc0c)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>