@jonasschnelli wrote in #14979:
> #14573 broke < Qt5.6 compatibility due to calling the lambda version of `addAction` that was added in Qt5.6.

We currently [support](https://github.com/bitcoin/bitcoin/blob/master/doc/dependencies.md) QT >=5.2, but hardly anyone tests with that. If we make one of the Travis machines use it, we should have a better change of catching this.

See also discussion about minimum QT version in #13478 
WalletTxStatus& tx_status,
        WalletOrderForm& order_form,
        bool& in_mempool,
        int& num_blocks) override
    {
        auto locked_chain = m_wallet.chain().lock();
        LOCK(m_wallet.cs_wallet);
        auto mi = m_wallet.mapWallet.find(txid);
        if (mi != m_wallet.mapWallet.end()) {
            num_blocks = locked_chain->getHeight().get_value_or(-1);
            in_mempool = mi->second.InMempool();
            order_form = mi->second.vOrderForm;
            tx_status = MakeWalletTxStatus(*locked_chain, mi->second);
            return MakeWalletTx(*locked_chain, m_wallet, mi->second);
        }
        return {};
    }
    WalletBalances getBalances() override