@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 
if (!AddToWalletIfInvolvingMe(ptx, block_hash, posInBlock, update_tx))
        return; 
    
    
    
    MarkInputsDirty(ptx);
}
void CWallet::TransactionAddedToMempool(const CTransactionRef& ptx) {
    auto locked_chain = chain().lock();
    LOCK(cs_wallet);
    SyncTransaction(ptx, {} , 0 );
    auto it = mapWallet.find(ptx->GetHash());
    if (it != mapWallet.end()) {
        it->second.fInMempool = true;
    }
}
void CWallet::TransactionRemovedFromMempool(const CTransactionRef &ptx) {