source of many bugs
commit d84e9cbd2f0755f9106344dbb4a2582c7752ffd5 Author: Sergio Martins <smartins@kde.org> Date: Sat Dec 10 15:30:35 2016 +0000 Introduce new check: base-class-event Warns when you return false inside your QEvent::event() or QEvent::eventFilter() re-implementation. Call the base method instead.