When viewing the diff for a long file, the left and right sides are not aligned.

The issue has been raised in test Campaign Tuleap 17.0 - Non regression
Test case Diff side by side

sections from each side are not aligned
there is a line added/missed for each block of diff (it must be the ~20th so there is a diff of ~20 lines)\

See reproduction

Scenario to reproduce:

1. Create a repository called testpr
2. Clone a bare repository:  git clone --bare git@github.com:vuejs/vue-test-utils.git
3. Push --mirror to your project repository: cd vue-test-utils && git push --mirror ssh://gitolite@tuleap.valid.enalean.com/...
4. Create a PR from migrate-to-jest to dev
5. Show the file diff for the .yarn.lock file (in side-by-side mode)