bookmarks: update only proper bookmarks on push -r/-B (issue 3973)

Make push -r/-B update only these bookmarks that point to pushed revisions
or their ancestors, so we can be sure that commit pointed by bookmark is
present in the remote reposiory. Previously push tried to update all shared
bookmarks.

mercurial/localrepo.py

@@ -1951,6 +1951,9 b' class localrepository(object):'
 
         self.ui.debug("checking for updated bookmarks\n")
         rb = remote.listkeys('bookmarks')
+        revnums = map(unfi.changelog.rev, revs or [])
+        ancestors = [
+            a for a in unfi.changelog.ancestors(revnums, inclusive=True)]
         for k in rb.keys():
             if k in unfi._bookmarks:
                 nr, nl = rb[k], hex(self._bookmarks[k])
@@ -1958,6 +1961,8 b' class localrepository(object):'
                     cr = unfi[nr]
                     cl = unfi[nl]
                     if bookmarks.validdest(unfi, cr, cl):
+                        if ancestors and cl.rev() not in ancestors:
+                            continue
                         r = remote.pushkey('bookmarks', k, nr, nl)
                         if r:
                             self.ui.status(_("updating bookmark %s\n") % k)

tests/test-bookmarks-pushpull.t

@@ -422,7 +422,6 b' of this test.'
   remote: adding manifests
   remote: adding file changes
   remote: added 1 changesets with 1 changes to 1 files
-  updating bookmark @ failed!
   exporting bookmark add-foo
 
   $ cd ..