This amends commit 353ce5344fbde5a6cecbdd2c131e1cf0f4b7f383 so that
the behavior doesn't depend on the widget style.
If QStyle::PM_MenuPanelWidth returns 2, then size will be (2x2),
which is hardly a valid menu to show - don't show that either.
Task-number: QTBUG-129108
Change-Id: I2daa05932ea00971880747daeffdfa20a8be3f22
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
(cherry picked from commit 9dfd8410b07b0c484443ad6355004ace5f9b2b8b)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
(cherry picked from commit bbc46bbc7a15728264574c39e13b6be4c9229b54)
d275841dd1