revlog: don't try to partialmatch strings those length > 40
_partialmatch() does prefix matching against nodes. String passed
to _partialmetch() actualy may be any string, not prefix only.
For example,
"
e410be8603932e46a51298748a4b874739037fad or 300" is a good
argument for _partialmatch().
When _partialmatch() searches using radix tree, index_partialmatch()
C function shouldn't try to match too long strings.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing:
$ make local # build for inplace usage
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See http://mercurial.selenic.com/ for detailed installation
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