revlog: fix for generaldelta distance calculation The decision whether or not to store a full snapshot instead of a delta is done based on the distance value calculated in _addrevision.builddelta(rev). This calculation traditionally used the fact of deltas only using the previous revision as base. Generaldelta mechanism is changing this, yet the calculation still assumes that current-offset minus chainbase-offset equals chain-length. This appears to be wrong. This patch corrects the calculation by means of using the chainlength function if Generaldelta is used.

Merge

tests: reduce spurious failures when run with generaldelta Quite a few tests fail in noisy but meaningless ways when the test suite is run with generaldelta enabled: ./run-tests.py --extra-config-opt=format.generaldelta=1 This reduces the amount of noise introduced by the debugindex command, the main source of differences. In my environment, when testing with generaldelta enabled, this change reduces the number of completely failing tests from 21 to 8.