clfilter: unfilter some parts of the push logic

Computation of common changesets during push needs to be done on the
widest set possible. An unfiltered version of the repo is kept for
discovery and various revset calls. The discovery code itself enforces
the filtering of unserved outgoing changeset.

mercurial/localrepo.py

@@ -1869,25 +1869,26 b' class localrepository(object):'
             if not unbundle:
                 lock = remote.lock()
             try:
+                unfi = self.unfiltered()
                 # discovery
                 fci = discovery.findcommonincoming
-                commoninc = fci(self, remote, force=force)
+                commoninc = fci(unfi, remote, force=force)
                 common, inc, remoteheads = commoninc
                 fco = discovery.findcommonoutgoing
-                outgoing = fco(self, remote, onlyheads=revs,
+                outgoing = fco(unfi, remote, onlyheads=revs,
                                commoninc=commoninc, force=force)
 
 
                 if not outgoing.missing:
                     # nothing to push
-                    scmutil.nochangesfound(self.ui, self, outgoing.excluded)
+                    scmutil.nochangesfound(unfi.ui, unfi, outgoing.excluded)
                     ret = None
                 else:
                     # something to push
                     if not force:
                         # if self.obsstore == False --> no obsolete
                         # then, save the iteration
-                        if self.obsstore:
+                        if unfi.obsstore:
                             # this message are here for 80 char limit reason
                             mso = _("push includes obsolete changeset: %s!")
                             msu = _("push includes unstable changeset: %s!")
@@ -1897,14 +1898,14 b' class localrepository(object):'
                             # least one of the missinghead will be obsolete or
                             # unstable. So checking heads only is ok
                             for node in outgoing.missingheads:
-                                ctx = self[node]
+                                ctx = unfi[node]
                                 if ctx.obsolete():
                                     raise util.Abort(mso % ctx)
                                 elif ctx.unstable():
                                     raise util.Abort(msu % ctx)
                                 elif ctx.bumped():
                                     raise util.Abort(msb % ctx)
-                        discovery.checkheads(self, remote, outgoing,
+                        discovery.checkheads(unfi, remote, outgoing,
                                              remoteheads, newbranch,
                                              bool(inc))
 
@@ -1957,7 +1958,7 b' class localrepository(object):'
                     cheads = [node for node in revs if node in common]
                     # and
                     # * commonheads parents on missing
-                    revset = self.set('%ln and parents(roots(%ln))',
+                    revset = unfi.set('%ln and parents(roots(%ln))',
                                      outgoing.commonheads,
                                      outgoing.missing)
                     cheads.extend(c.node() for c in revset)
@@ -1980,7 +1981,7 b' class localrepository(object):'
                     # Get the list of all revs draft on remote by public here.
                     # XXX Beware that revset break if droots is not strictly
                     # XXX root we may want to ensure it is but it is costly
-                    outdated =  self.set('heads((%ln::%ln) and public())',
+                    outdated =  unfi.set('heads((%ln::%ln) and public())',
                                          droots, cheads)
                     for newremotehead in outdated:
                         r = remote.pushkey('phases',