swarm/src/toggle: Ignore listen upgr errors when disabled #1945
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A disabled
ToggleProtoHandlercan receive listen upgrade errors in thefollowing two cases:
Protocol negotiation on an incoming stream failed with no protocol being
agreed on.
When combining
ProtocolsHandlerimplementations a singleProtocolsHandlermight be notified of an inbound upgrade error unrelated to its own upgrade
logic. For example when nesting a
ToggleProtoHandlerin aProtocolsHandlerSelectthe former might receive an inbound upgrade erroreven when disabled.
ToggleProtoHandlershould ignore the error in both of these cases.Fixes paritytech/polkadot#2373.