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e2fe4c2955
In this commit, we modify the way the link handles HTLC’s that it detects is destined for itself. Before this commit if a payment hash came across for an invoice we’d already settled, then we’d gladly accept the payment _again_. As we’d like to enforce the norm that an invoice is NEVER to be used twice, this commit modifies that behavior to instead reject an incoming payment that attempts to re-use an invoice. Fixes #560.