Once we have revealed our preimage to the world with a sweep attempt,
we can safely push our preimage to the server to speed up on chain
claim.
Rather than rely on the server, we use the state of our invoice in lnd
to determine whether we should continue trying to push the preimage to
the server.
Projects that use a later version of lnd than loop, but also depend on
loop itself would run into the following build error:
github.com/lightninglabs/loop/lndclient
../../go/pkg/mod/github.com/lightninglabs/loop@v0.2.3-alpha/lndclient/walletkit_client.go:30:11: undefined: lnwallet.SatPerKWeight
../../go/pkg/mod/github.com/lightninglabs/loop@v0.2.3-alpha/lndclient/walletkit_client.go:32:54: undefined: lnwallet.SatPerKWeight
../../go/pkg/mod/github.com/lightninglabs/loop@v0.2.3-alpha/lndclient/walletkit_client.go:144:33: undefined: lnwallet.SatPerKWeight
../../go/pkg/mod/github.com/lightninglabs/loop@v0.2.3-alpha/lndclient/walletkit_client.go:176:2: undefined: lnwallet.SatPerKWeight
../../go/pkg/mod/github.com/lightninglabs/loop@v0.2.3-alpha/lndclient/walletkit_client.go:189:9: undefined: lnwallet.SatPerKWeight
