view tests/test-filelog.py.out @ 22356:3c8fb24334e9

branchmap: issue a single call to `ancestors` for all heads

There is no reason to make multiple calls. This provides a massive speedup for
repo with a lot of heads.

On a strongly headed repo this gives humble speedup in simple case:

    from 8.1097 to 5.1051

And massive speedup in other case:

    from 7.8787 to 0.1984

ERROR: FIXME: This is a known failure of filelog.size for data starting with \1\n
OK.