largefiles: include largefiles when doing log on a directory (issue4241)

The matchers _files had to include both the real root and the standin version
of the root.

hgext/largefiles/overrides.py

@@ -282,6 +282,8 b' def overridelog(orig, ui, repo, *pats, *'
             standin = lfutil.standin(m._files[i])
             if standin in repo[ctx.node()]:
                 m._files[i] = standin
+            elif m._files[i] not in repo[ctx.node()]:
+                m._files.append(standin)
             pats.add(standin)
 
         m._fmap = set(m._files)

tests/test-largefiles.t

@@ -390,6 +390,14 b' Committing directories containing only l'
   A sub2/large7
   A z/y/x/large2
   A z/y/x/m/large1
+
+(and a bit of log testing)
+
+  $ hg log -T '{rev}\n' z/y/x/m/large1
+  7
+  $ hg log -T '{rev}\n' z/y/x/m  # with only a largefile
+  7
+
   $ hg rollback --quiet
   $ touch z/y/x/m/normal
   $ hg add z/y/x/m/normal