transplant: only pull the transplanted revision (issue4692)

For some reason, transplant was pulling all remote revisions when transplanting
from a remote repository (unless --branch was
specified).

hgext/transplant.py

@@ -625,8 +625,14 b' def transplant(ui, repo, *revs, **opts):'
     if sourcerepo:
         peer = hg.peer(repo, opts, ui.expandpath(sourcerepo))
         heads = map(peer.lookup, opts.get('branch', ()))
+        target = set(heads)
+        for r in revs:
+            try:
+                target.add(peer.lookup(r))
+            except error.RepoError:
+                pass
         source, csets, cleanupfn = bundlerepo.getremotechanges(ui, repo, peer,
-                                    onlyheads=heads, force=True)
+                                    onlyheads=sorted(target), force=True)
     else:
         source = repo
         heads = map(source.lookup, opts.get('branch', ()))

tests/test-transplant.t

@@ -313,13 +313,11 b' remote transplant with pull'
   0  r1
 
 remote transplant without pull
-(I'm pretty sure this test is actually pulling,
-It was using "2" and "4" (as the previous transplant used to) which referenced
+(It was using "2" and "4" (as the previous transplant used to) which referenced
 revision different from one run to another)
 
   $ hg pull -q http://localhost:$HGPORT/
   $ hg transplant -s http://localhost:$HGPORT/ 8d9279348abb 722f4667af76
-  searching for changes
   skipping already applied revision 2:8d9279348abb
   applying 722f4667af76
   722f4667af76 transplanted to 76e321915884