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grandpa: generic voting rule for backing off from best block #4635
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We already had a voting rule that made sure that the GRANDPA voter would vote at most for
best_block - 1. This PR changes the rule so that the distance from best block is arbitrary. Additionally, we change the default distance to be 2 blocks.This is useful for Kusama in case we need to easily revert a borked runtime upgrade triggered through democracy.