While regtesting with [bitcoin-spock](https://github.com/msgilligan/bitcoin-spock) I noticed at some point the transaction creation via `sendtoaddress -> CreateTransaction()` fails, because the created transaction is larger than `MAX_STANDARD_TX_SIZE`.

During the process a lot of raw transactions are created, which have smallish outputs and when then using `sendtoaddress`, it appears to attempt to create a transaction that spends too many of those dust-ish outputs.

The transaction to create does not have many outputs, but it looks like it's caused by the coin selection, which selects too many inputs. Testing was done with a 0.9 branch, but on the first glimpse I believe this issue is as well be present in 0.10. If this is a known issue, and if there is already a guard against this behavior, I'd be happy about a hint.

Sorry in advance, I do not have a test script to reproduce this issue in an isolated manner. A potential fix would probably require to adjust the coin selection, so that it selects a combination of coins, which, in addition to the size of the rest of the transaction, is still smaller than the limit.

dummyWallet->SetupDescriptorScriptPubKeyMans();
        
        for (int i=0; i<10; i++) {
            add_coin(available_coins, *dummyWallet, 1 * COIN);
        }
    }
    {
        
        
        std::unordered_set<COutPoint, SaltedOutpointHasher> outs_to_remove;
        const auto& coins = available_coins.All();
        for (int i = 0; i < 2; i++) {
            outs_to_remove.emplace(coins[i].outpoint);
        }
        available_coins.Erase(outs_to_remove);
        
        const auto& updated_coins = available_coins.All();
        for (const auto& out: outs_to_remove) {
            auto it = std::find_if(updated_coins.begin(), updated_coins.end(), [&out](const COutput &coin) {
                return coin.outpoint == out;
            });
            BOOST_CHECK(it == updated_coins.end());
        }
        
        BOOST_CHECK_EQUAL(available_coins.Size(), 8);
    }
}
BOOST_AUTO_TEST_SUITE_END()
}