summary: make "outgoing" information sensitive to branch in URL (issue3829)

Before this patch, "outgoing" information of "hg summary --remote" is
not sensitive to the branch specified in the URL of the destination
repository, even though "hg push"/"hg outgoing" are so:

Invocation of "discovery.findcommonoutgoing()" without "onlyheads"
argument treats revisions on branches other than the one specified in
the URL as outgoing ones unexpectedly.

This patch looks head revisions, which are already detected by
"hg.addbranchrevs()" from URL, up against local repository, and
invokes "discovery.findcommonoutgoing()" with list of them as
"onlyheads" to limit calculation of outgoing revisions.

mercurial/commands.py

@@ -5481,8 +5481,10 b' def summary(ui, repo, **opts):'
             other = hg.peer(repo, {}, dest)
             commoninc = None
             ui.debug('comparing with %s\n' % util.hidepassword(dest))
+        if revs:
+            revs = [repo.lookup(rev) for rev in revs]
         repo.ui.pushbuffer()
-        outgoing = discovery.findcommonoutgoing(repo, other,
+        outgoing = discovery.findcommonoutgoing(repo, other, onlyheads=revs,
                                                 commoninc=commoninc)
         repo.ui.popbuffer()
         o = outgoing.missing

tests/test-url-rev.t

@@ -80,8 +80,25 b' Changing original repo:'
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add a
   
+  $ hg -q outgoing '../clone'
+  2:faba9097cad4
+  3:4cd725637392
+  $ hg summary --remote --config paths.default='../clone'
+  parent: 3:4cd725637392 tip
+   add bar
+  branch: default
+  commit: (clean)
+  update: (current)
+  remote: 2 outgoing
   $ hg -q outgoing '../clone#foo'
   2:faba9097cad4
+  $ hg summary --remote --config paths.default='../clone#foo'
+  parent: 3:4cd725637392 tip
+   add bar
+  branch: default
+  commit: (clean)
+  update: (current)
+  remote: 1 outgoing
 
   $ hg -q push '../clone#foo'