tests/test-check-jshint.t

dirstate: enforce context set_clean and set_possibly_dirty

We don't want them called within a `changing_parents` context, but we still want
them called within a context.

So we update the decorator accordingly

#require test-repo jshint hg10

  $ . "$TESTDIR/helpers-testrepo.sh"

run jshint on all tracked files ending in .js except vendored dependencies

  $ cd "`dirname "$TESTDIR"`"

  $ testrepohg locate 'set:**.js' \
  > 2>/dev/null \
  > | xargs jshint