Exchange of an altcoin to BTC is not tracked properly causing significant 8949 profit/loss calculation mistake

[CoolSpot]

For tax purposes, exchange of a $COIN to BTC is recorded as two transactions:

1. sell $COIN for USD
2. buy BTC with USD
   This is handled in the function CoinTaxes.py->fix_orders().

There is a mistake that for amount of $COIN sold, the order['cost'] is used instead of order['amount'].
The order['cost'] contains amount of BTC purchased, while order['amount'] contains amount of $COIN sold.

For example, if in reality you have sold 10 ETH to buy 1 BTC, due to the error, that would be recorded as two transactions:

1. sale of 1 ETH for USD cost of 10 BTC
2. purchase of 10 BTC with USD from the above
   Which significantly interferes with gain/loss and proceeds calculations.