QPlatformMediaIntegration::instance() uses QtGlobalStatic::ApplicationHolder to implement functionality similar to Q_APPLICATION_STATIC. The goal is to tie object lifetime to an application if it exists, but fall back to behave as a Q_GLOBAL_STATIC if it no qt application object exists.

However, since QtGlobalStatic::ApplicationHolder is an implementation detail of Q_APPLICATION_STATIC, we should not use QtGlobalStatic::ApplicationHolder in user code