[1.0-beta2] P2P: Fix multiple range requests while syncing #291
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Since blocks are processed immediately into the fork database when received, there is no longer any reason to request ahead of the existing range. Under normal circumstances a node will receive blocks from its peer and process them into the fork database. While those blocks are being applied additional blocks can be requested from the network. Care is taken to make sure that the fork database does not out run the chain head by more than
sync-fetch-span
.Resolves #281