outgoing: run on filtered repo

outgoing has been using an unfiltered repo since fe67107094fd (discovery:
outgoing pass unfiltered repo to findcommonincoming (issue3776),
2013-01-28). If I'm reading code and history correctly, it should be
safe to run _outgoing() on a filtered repo since c5456b64eb07
(discovery: run discovery on filtered repository, 2015-01-07). By
running _outgoing() on a filtered repo, we can also remove the
workaround there for ignoring filtered revisions.

mercurial/hg.py

@@ -869,7 +869,7 b' def _outgoing(ui, repo, dest, opts):'
         revs = [repo.lookup(rev) for rev in scmutil.revrange(repo, revs)]
 
     other = peer(repo, opts, dest)
-    outgoing = discovery.findcommonoutgoing(repo.unfiltered(), other, revs,
+    outgoing = discovery.findcommonoutgoing(repo, other, revs,
                                             force=opts.get('force'))
     o = outgoing.missing
     if not o:

mercurial/scmutil.py

@@ -120,10 +120,6 b' def nochangesfound(ui, repo, excluded=No'
     secretlist = []
     if excluded:
         for n in excluded:
-            if n not in repo:
-                # discovery should not have included the filtered revision,
-                # we have to explicitly exclude it until discovery is cleanup.
-                continue
             ctx = repo[n]
             if ctx.phase() >= phases.secret and not ctx.extinct():
                 secretlist.append(n)