scm: mercurial: model: save parent/child relation for changesets (#5501)

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@7713 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/repository/mercurial.rb

@@ -142,6 +142,11 @@ class Repository::Mercurial < Repository
                                 :committed_on => re.time,
                                 :comments     => re.message)
           re.paths.each { |e| cs.create_change(e) }
+          parents = {}
+          parents[cs] = re.parents unless re.parents.nil?
+          parents.each do |ch, chparents|
+            ch.parents = chparents.collect{|rp| find_changeset_by_name(rp)}.compact
+          end
         end
       end
     end