summary: make "incoming" information sensitive to branch in URL (issue3830)

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

Invocation of "discovery.findcommonincoming()" without "heads"
argument treats revisions on branches other than the one specified in
the URL as incoming ones unexpectedly.

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

mercurial/commands.py

@@ -5467,9 +5467,11 b' def summary(ui, repo, **opts):'
         other = hg.peer(repo, {}, source)
         revs, checkout = hg.addbranchrevs(repo, other, branches,
                                           opts.get('rev'))
+        if revs:
+            revs = [other.lookup(rev) for rev in revs]
         ui.debug('comparing with %s\n' % util.hidepassword(source))
         repo.ui.pushbuffer()
-        commoninc = discovery.findcommonincoming(repo, other)
+        commoninc = discovery.findcommonincoming(repo, other, heads=revs)
         _common, incoming, _rheads = commoninc
         repo.ui.popbuffer()
         if incoming:

tests/test-url-rev.t

@@ -100,6 +100,16 b' Changing original repo:'
   update: (current)
   remote: 1 outgoing
 
+  $ hg -q --cwd ../clone incoming '../repo#foo'
+  2:faba9097cad4
+  $ hg --cwd ../clone summary --remote --config paths.default='../repo#foo'
+  parent: 1:cd2a86ecc814 tip
+   change a
+  branch: foo
+  commit: (clean)
+  update: (current)
+  remote: 1 or more incoming
+
   $ hg -q push '../clone#foo'
 
   $ hg --cwd ../clone heads
@@ -115,6 +125,16 b' Changing original repo:'
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     add a
   
+  $ hg -q --cwd ../clone incoming '../repo#foo'
+  [1]
+  $ hg --cwd ../clone summary --remote --config paths.default='../repo#foo'
+  parent: 1:cd2a86ecc814 
+   change a
+  branch: foo
+  commit: (clean)
+  update: 1 new changesets (update)
+  remote: (synced)
+
   $ cd ..
 
   $ cd clone