Add KNotifyConfigWidget::configure() alternative for QWindow parent
It might be a little more work to create a fully Qt Quick based alternative for KNotifyConfigWidget, but in the meantime we can still make life easier for Qt Quick users.
This new overload, based on (now extinct) code from Plasma's Notifications KCM, doesn't require the caller to pass a QWidget as parent. Instead, it will accept a QWindow (e.g. render window for your QQuickItem) as transient parent of the created notification config dialog, so the dialog can still be modal.