.jshintrc

match: make exactmatcher.visitchildrenset return file children as well

Previously, if we had an exactmatcher like ['foo.txt', 'a/bar.txt', 'a/b/c/baz.txt'], we'd
get back the following data:
  '.': {'a'}
  'a': {'b'}
  'a/b': {'c'}
  'a/b/c': 'this'
  'a/b/c/d': set()

This was incorrect, since visitchildrenset explicitly says not to pay attention
to 'foo.txt' and 'a/bar.txt' by not returning them or 'this'. Given the near
impossibility of making visitchildrenset reliabbly produce only subdirectories,
a previous commit has made it documented and expected that visitchildrenset can
return a set containing both files and subdirectories to visit, instead of
implying/requiring that visitchildrenset() return 'this' if there are files to
visit. This makes the code for exactmatcher match this clarified documentation.

Differential Revision: https://phab.mercurial-scm.org/D4365

{
    // Enforcing
    "eqeqeq"        : true,     // true: Require triple equals (===) for comparison
    "forin"         : true,     // true: Require filtering for..in loops with obj.hasOwnProperty()
    "freeze"        : true,     // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
    "nonbsp"        : true,     // true: Prohibit "non-breaking whitespace" characters.
    "undef"         : true,     // true: Require all non-global variables to be declared (prevents global leaks)

    // Environments
    "browser"       : true      // Web Browser (window, document, etc)
}