Fix followups headers hovering

Change-Id: I59234c19e5ddee018f9dac779aa8114e77ee99dc
Merge commit 'refs/changes/58/2358/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  Fix followups headers hovering

Change-Id: I65d57e4b3690d33337aa3a5ceed197b3647d1dad
This is Tuleap 6.12.99.86

Change-Id: If1c528dda13bccdd6889790dc1ac512060a52938