calculate nonce from confirmed only

[ligi]

when one transaction fails for a reason - all the following ones will never be confirmed as there is the nonce of the failed missing. I think UX can be improved by only counting nonces of confirmed tx

[omarbenhamid]

I ran into this issue in fact, and worst : when a transaction is pending (for too low gas price for example) all following ones will not be mined neither. What do you think of :

1. Offer a button to "cancel" pending transactions by sending a 0ETH transaction with higher gaz price and same nonce.
2. Showing an alert when we sign a transaction if the nonce is not likely to be mined directly.