tasks #6765: Add a inner scrollbar if there is a lot of references in the sidebar

Change-Id: Ifc97cc3a941c68901d5ba5dd9875052701cb5a90
Merge commit 'refs/changes/43/2343/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #6765: Add a inner scrollbar if there is a lot of references in the sidebar

Change-Id: Icc3d7f4c31274e1f37e85ecf10e13a5d423a8358
This is Tuleap 6.12.99.81

Change-Id: I1990bce080dbdc6a41e9d748739d561f332ac70f