p2p: During block download, adjust pindexLastCommonBlock right away #29
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This allows us to calculate nWndowEnd better. Before, it would be calculated based on an old pindexLastCommonBlock, which could result in blocks not requested for download that could have been requested, and peers being wrongly marked as staller.
This reverts commit 49d569c which introduced extra logic for when a snapshot was loaded. With the previous commit, this is not longer necessary because the more general logic of advancing pindexLastCommonBlock also covers this case.
getpeerinfo provides a list of blocks that are inflight, which can be used instead.
This test (which would fail without the previous commit) checks that after the stalling block was received, we don't incorrectly mark another peer as a staller immediately.
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