Do set the global application flag AA_DisableWindowContextHelpButton
to avoid having to unset the default WindowContextHelpButtonHint
in every single dialog.
AA_DisableWindowContextHelpButton was added in Qt 5.10.
Change-Id: I21fe8bc5ddfa4c01ec7a799b04bfb6ff1c9d6d86
Reviewed-by: Eike Ziller <eike.ziller@qt.io>