request #7084: Custom scrolling in child pane scroll parent when it comes to end

Change-Id: I4e5a1c0a62d6d76ddbbb2442a12a2f85a6a77816
Merge commit 'refs/changes/68/2668/1' of ssh://gerrit.tuleap.net:29418/tuleap into stable

* ssh://gerrit.tuleap.net:29418/tuleap:
  request #7084: Custom scrolling in child pane scroll parent when it comes to end
This is Tuleap 7.1.99.51

Change-Id: Ic7372b7341989d6e6a3a227a65b00b3c839d2c35