task #6682 - editing an artifact on one value shows a diff on permission on artifact

Change-Id: I29711c7630a43355dc300e6951d581f72c751116
Merge commit 'refs/changes/27/2327/4' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

Change-Id: Ifc2a9e45f6a0a075c26c78a8f5569245c0ba8b44
This is Tuleap 6.12.99.75

Change-Id: I7e52f049297014859109a0bae30a29889f190c41