narrow: use `update_file` instead of `normallookup` after update

This is the newer, more semantic API.

Differential Revision: https://phab.mercurial-scm.org/D11181

mercurial/narrowspec.py

@@ -351,6 +351,6 b' def updateworkingcopy(repo, assumeclean='
     addedmatch = matchmod.intersectmatchers(addedmatch, sparse.matcher(repo))
     newfiles = [f for f in pctx.manifest().walk(addedmatch) if f not in ds]
     for f in newfiles:
-        ds.normallookup(f)
+        ds.update_file(f, p1_tracked=True, wc_tracked=True, possibly_dirty=True)
     _writeaddedfiles(repo, pctx, newfiles)
     repo._updatingnarrowspec = False