gitdirstate: use normalized path from _walkexplicit

Since 2bb13f2b778c in Mercurial, _walkexplicit returns a tuple, so ensure
we are up to date and take the normalized path which is the first part of the
tuple.

Based on a patch by David Soria Parra <davidsp@fb.com>.

hggit/gitdirstate.py

@@ -163,7 +163,11 @@ def fwarn(f, msg):
         results, work, dirsnotfound = self._walkexplicit(match, subrepos)
 
         skipstep3 = skipstep3 and not (work or dirsnotfound)
-        work = [d for d in work if not dirignore(d)]
+        if work and isinstance(work[0], tuple):
+            # Mercurial >= 3.3.3
+            work = [nd for nd, d in work if not dirignore(d)]
+        else:
+            work = [d for d in work if not dirignore(d)]
         wadd = work.append
 
         # step 2: visit subdirectories