largefiles: fix _always for match overrides

Upcoming patches will speed dirstate.walk up by not filtering based on the
match function when match.always() is True. For that to work, match.always()
needs to be accurate. Previously it wasn't so for largefiles.

hgext/largefiles/overrides.py

@@ -34,6 +34,7 b' def installnormalfilesmatchfn(manifest):'
                 manifest)
         m._files = filter(notlfile, m._files)
         m._fmap = set(m._files)
+        m._always = False
         origmatchfn = m.matchfn
         m.matchfn = lambda f: notlfile(f) and origmatchfn(f) or None
         return m
@@ -251,6 +252,7 b' def overridelog(orig, ui, repo, *pats, *'
         standins = [lfutil.standin(f) for f in m._files]
         m._files.extend(standins)
         m._fmap = set(m._files)
+        m._always = False
         origmatchfn = m.matchfn
         def lfmatchfn(f):
             lf = lfutil.splitstandin(f)
@@ -519,6 +521,7 b' def overridecopy(orig, ui, repo, pats, o'
                 lfile = lambda f: lfutil.standin(f) in manifest
                 m._files = [lfutil.standin(f) for f in m._files if lfile(f)]
                 m._fmap = set(m._files)
+                m._always = False
                 origmatchfn = m.matchfn
                 m.matchfn = lambda f: (lfutil.isstandin(f) and
                                     (f in manifest) and
@@ -625,6 +628,7 b' def overriderevert(orig, ui, repo, *pats'
                 m._files = [tostandin(f) for f in m._files]
                 m._files = [f for f in m._files if f is not None]
                 m._fmap = set(m._files)
+                m._always = False
                 origmatchfn = m.matchfn
                 def matchfn(f):
                     if lfutil.isstandin(f):