revlog: make addgroup returns a list of node contained in the added source

This list will contains any node see in the source, not only the added one.
This is intended to allow phase to be move according what was pushed by client
not only what was added.

mercurial/localrepo.py

@@ -2015,8 +2015,8 b' class localrepository(repo.repository):'
             source.callback = pr
 
             source.changelogheader()
-            if (cl.addgroup(source, csmap, trp) is None
-                and not emptyok):
+            srccontent = cl.addgroup(source, csmap, trp)
+            if not (srccontent or emptyok):
                 raise util.Abort(_("received changelog group is empty"))
             clend = len(cl)
             changesets = clend - clstart
@@ -2064,7 +2064,7 b' class localrepository(repo.repository):'
                 pr()
                 fl = self.file(f)
                 o = len(fl)
-                if fl.addgroup(source, revmap, trp) is None:
+                if not fl.addgroup(source, revmap, trp):
                     raise util.Abort(_("received file revlog group is empty"))
                 revisions += len(fl) - o
                 files += 1

mercurial/revlog.py

@@ -1131,6 +1131,7 b' class revlog(object):'
         """
 
         # track the base of the current delta log
+        content = []
         node = None
 
         r = len(self)
@@ -1161,6 +1162,8 b' class revlog(object):'
                 deltabase = chunkdata['deltabase']
                 delta = chunkdata['delta']
 
+                content.append(node)
+
                 link = linkmapper(cs)
                 if node in self.nodemap:
                     # this can happen if two branches make the same change
@@ -1190,7 +1193,7 b' class revlog(object):'
                 dfh.close()
             ifh.close()
 
-        return node
+        return content
 
     def strip(self, minlink, transaction):
         """truncate the revlog on the first revision with a linkrev >= minlink