Method waitForNotificationsIfTipChanged

src/node/interfaces.cpp:796–800

        return std::make_unique<NotificationsHandlerImpl>(validation_signals(), std::move(notifications));
    }
    void waitForNotificationsIfTipChanged(const uint256& old_tip) override
    {
        if (!old_tip.IsNull() && old_tip == WITH_LOCK(::cs_main, return chainman().ActiveChain().Tip()->GetBlockHash())) return;
        validation_signals().SyncWithValidationInterfaceQueue();
    }
    void waitForNotifications() override
    {
        validation_signals().SyncWithValidationInterfaceQueue();