view .arcconfig @ 44851:708ad5cf5e5a

grep: grep the working copy faster

`hg grep qqqq` in the mercurial repo:
before: 0,859s
after: 0,233s

`hg grep somethingwithnomatch` in mozilla-central:
before: 51s
after: 19s

This is probably also a tiny bug fix, because the code was looking up
a node for filename `pfn` on a filelog for filename `fn`, which are
most of the time the same filename, but don't have to be.

Ignoring performance and the bug fix, the code should have the same
behavior.

Differential Revision: https://phab.mercurial-scm.org/D8545

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