c.a_repo = c.pull_request.other_repo

        (c.a_ref_type,

         c.a_ref_name,

         c.a_rev) = c.pull_request.other_ref.split(':') # other_rev is ancestor

        org_scm_instance = c.cs_repo.scm_instance # property with expensive cache invalidation check!!!

        c.cs_repo = c.cs_repo

        c.cs_ranges = [org_scm_instance.get_changeset(x) for x in c.pull_request.revisions]

        c.cs_ranges_org = None # not stored and not important and moving target - could be calculated ...

        revs = [ctx.revision for ctx in reversed(c.cs_ranges)]

        c.jsdata = json.dumps(graph_data(org_scm_instance, revs))

        c.cs_branch_name = c.cs_ref_name

        other_scm_instance = c.a_repo.scm_instance

        c.update_msg = ""

        c.update_msg_other = ""

        if org_scm_instance.alias == 'hg' and c.a_ref_name != 'ancestor':

            if c.cs_ref_type != 'branch':

                c.cs_branch_name = org_scm_instance.get_changeset(c.cs_ref_name).branch # use ref_type ?

            c.a_branch_name = c.a_ref_name

            if c.a_ref_type != 'branch':

                try:

                    c.a_branch_name = other_scm_instance.get_changeset(c.a_ref_name).branch # use ref_type ?

                except EmptyRepositoryError:

                    c.a_branch_name = 'null' # not a branch name ... but close enough

            # candidates: descendants of old head that are on the right branch

            #             and not are the old head itself ...

            #             and nothing at all if old head is a descendent of target ref name

            if other_scm_instance._repo.revs('present(%s)::&%s', c.cs_ranges[-1].raw_id, c.a_branch_name):

                c.update_msg = _('This pull request has already been merged to %s.') % c.a_branch_name

            elif c.pull_request.is_closed():

                c.update_msg = _('This pull request has been closed and can not be updated.')

            else: # look for descendants of PR head on source branch in org repo

                    c.update_msg = _('This pull request can be updated with changes on %s:') % c.cs_branch_name

                else:

                    c.update_msg = _('No changesets found for updating this pull request.')

                # TODO: handle branch heads that not are tip-most

                if brevs:

                    c.update_msg_other = _('Note: Branch %s has another head: %s.') % (c.cs_branch_name,

                        h.short_id(org_scm_instance.get_changeset((max(brevs))).raw_id))

        elif org_scm_instance.alias == 'git':

            c.update_msg = _("Git pull requests don't support updates yet.")

        raw_ids = [x.raw_id for x in c.cs_ranges]

        c.cs_comments = c.cs_repo.get_comments(raw_ids)

        c.statuses = c.cs_repo.statuses(raw_ids)

        ignore_whitespace = request.GET.get('ignorews') == '1'

        line_context = request.GET.get('context', 3)

        c.ignorews_url = _ignorews_url

        c.context_url = _context_url

        c.fulldiff = request.GET.get('fulldiff')

        diff_limit = self.cut_off_limit if not c.fulldiff else None

                  <span>${c.pull_request.author.username_and_name}</span><br/>

                  <span><a href="mailto:${c.pull_request.author.email}">${c.pull_request.author.email}</a></span><br/>

              </div>

          </div>

        </div>

        <div class="field">

            <div class="label-summary">

              <label>${_('Update')}:</label>

            </div>

            <div class="input">

              <div class="msg-div">${c.update_msg}</div>

              <div id="updaterevs" style="max-height:200px; overflow-y:auto; overflow-x:hidden; margin-bottom: 10px">

                      %if cs.revision == c.cs_ranges[-1].revision:

                        <td>

                          %if editable:

                            ${h.radio(name='updaterev', value='')}

                          %endif

                        </td>

                        <td colspan="2">${_("Current revision - no change")}</td>

                      %else:

                        <td>

                          %if editable:

                            ${h.radio(name='updaterev', value=cs.raw_id)}

                          %endif

                       c.current_voting_result,

                       is_pr=True, change_status=c.allowed_to_change_status)}

    <script type="text/javascript">

      $(document).ready(function(){

          PullRequestAutoComplete('user', 'reviewers_container', _USERS_AC_DATA, _GROUPS_AC_DATA);

          $('.add-bubble').click(function(e){

              var tr = e.currentTarget;

              injectInlineForm(tr.parentNode.parentNode);

          });

          // inject comments into they proper positions

          var file_comments = $('.inline-comment-placeholder').toArray();

          renderInlineComments(file_comments);

          linkInlineComments(document.getElementsByClassName('firstlink'), document.getElementsByClassName("inline-comment"));

          $('#updaterevs input').change(function(e){

              var update = !!e.target.value;

              $('#pr-form-save').prop('disabled',update);

              $('#pr-form-clone').prop('disabled',!update);

          });

          var $org_review_members = $('#review_members').clone();