regtests: add test "swapserver_server_skip_onchain_funding" #9986
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SomberNight
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Even if it decides there is nothing to sweep from the ctx/etc, it still needs to keep watching until a reorg-safe depth.
- the fabled return of the "inject_fees" command :D - also make fee_estimates.has_data() smarter, to ignore extraneous targets
- if fee estimates are high atm, some outputs are not worth to sweep
- however, fee estimates might be only-temporarily very high
- previously in such a case lnwatcher would just discard outputs as dust,
and mark the channel REDEEMED (and hence never watch it or try again)
- now, instead, if the outputs would not be dust if fee estimates were lower,
lnwatcher will keep watching the channel
- and if estimates go down, lnwatcher will sweep them then
- relatedly, previously txbatcher.is_dust() used allow_fallback_to_static_rates=True,
and it erroneously almost always fell back to the static rates (150 s/b) during
startup (race: lnwatcher was faster than the network managed to get estimates)
- now, instead, txbatcher.is_dust() does not fallback to static rates,
and the callers are supposed to handle NoDynamicFeeEstimates.
- I think this makes much more sense. The previous meaning of "is_dust"
with the fallback was weird. Now it means: "is dust at current feerates".
fixes spesmilo#9980
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related #9980