wip/sync: Force peers into ancestry search when blocks are not locally known#11917
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wip/sync: Force peers into ancestry search when blocks are not locally known#11917
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Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
Signed-off-by: Alexandru Vasile <alexandru.vasile@parity.io>
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This PR ensures peers are forced into ancestry search regardless if the announcement is the peer's current best.
This is because peers can reannounce their current best and we might continue on a different fork entirely.
Eventually, this will catchup to importing a block with an unkown parent.
Part of: #11916
Prior work: #11085
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