In the log I see things like:

    2017-09-13 03:54:33 init message: Rescanning...
    2017-09-13 03:54:33 Rescanning last 68616 blocks (from block 416339)...
    2017-09-13 03:54:40 AddToWallet xxxxx  update
    2017-09-13 03:55:33 Still rescanning. At block 418849. Progress=0.549138

I would be interested to see the wallet file name on each of these log lines.

Would there be any interest in merging such a PR?
if (change_position->nValue >= MIN_FINAL_CHANGE + additionalFeeNeeded) {
                        change_position->nValue -= additionalFeeNeeded;
                        nFeeRet += additionalFeeNeeded;
                        break; 
                    }
                }
                
                
                if (nSubtractFeeFromAmount > 0) {
                    pick_new_inputs = false;
                }
                
                nFeeRet = nFeeNeeded;
                coin_selection_params.use_bnb = false;
                continue;
            }
        }
        if (nChangePosInOut == -1) reservekey.ReturnKey(); 
        
        txNew.vin.clear();
        std::vector<CInputCoin> selected_coins(setCoins.begin(), setCoins.end());
        std::shuffle(selected_coins.begin(), selected_coins.end(), FastRandomContext());