view tests/sitecustomize.py @ 22357:9c3c3dc14a65

branchmap: pre-filter topological heads before ancestors based filtering

We know that topological heads will not be ancestors of anything, so we filter
them out to potentially reduce the range of the ancestors computation.

On a strongly headed repo this gives humble speedup:

    from 0.1984 to 0.1629

try:
    import coverage
    getattr(coverage, 'process_startup', lambda: None)()
except ImportError:
    pass