shortest: remove unnecessary check for revnum in isvalid()
We now always disambiguating against revnums after we've found an
otherwise valid prefix, so we can safely remove the early isrev()
check in isvalid().
Differential Revision: https://phab.mercurial-scm.org/D3501
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
for software developers.
Basic install::
$ 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
$ ./hg --version # should show the latest version
See https://mercurial-scm.org/ for detailed installation
instructions, platform-specific notes, and Mercurial user information.