view CONTRIBUTING @ 35458:5bec509dc1ff

log: make "slowpath" condition slightly more readable

Before 8e0e334bad42 and 6c76c42a5893, the condition was "anypats() or
(files() and --removed)". This can be read as "<match is actually slow>
or <walk files including removed revs>". So "not always()" (i.e. walk
file revs) seems more appropriate here.

The logic should be unchanged:

  not anypats() => always() or isexact() or prefix()
  isexact()     => not always()
  prefix()      => not always()

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