request #7498: Changing rank on graph is not working

Change-Id: Ife432b0e0fba4bc2ad83307a7a96f7bd6866a806
Merge commit 'refs/changes/67/3067/2' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #7498: Changing rank on graph is not working

Change-Id: I481d667154878eca285ddb7e79ba24353b2c006d
This is Tuleap 7.5.99.25

Change-Id: Ib18335ec1cea12ebd8effded1aed0bb60624124a