Only use engine->current in Qt 5.6 and up
Only use engine->current in Qt 5.6 and up

IronManMark20/pyside2,BadSingleton/pyside2,IronManMark20/pyside2,qtproject/pyside-pyside,IronManMark20/pyside2,BadSingleton/pyside2,IronManMark20/pyside2,gbaty/pyside2,qtproject/pyside-pyside,qtproject/pyside-pyside,qtproject/pyside-pyside,BadSingleton/pyside2,BadSingleton/pyside2,gbaty/pyside2,gbaty/pyside2,gbaty/pyside2,gbaty/pyside2,IronManMark20/pyside2,BadSingleton/pyside2,qtproject/pyside-pyside