--- a/hgext/show.py	Sun Apr 15 19:41:34 2018 +0800
+++ b/hgext/show.py	Fri Apr 13 10:36:03 2018 -0700
@@ -447,10 +447,8 @@
     """
     if not revs:
         return minlen
-    # don't use filtered repo because it's slow. see templater.shortest().
     cl = repo.changelog
-    return max(len(scmutil.shortesthexnodeidprefix(repo.unfiltered(),
-                                                   hex(cl.node(r)),
+    return max(len(scmutil.shortesthexnodeidprefix(repo, hex(cl.node(r)),
                                                    minlen)) for r in revs)
 
 # Adjust the docstring of the show command so it shows all registered views.