Fix diff comment alignment for parallel code additions

Clement Ho requested to merge fix-diff-comment-alignment into master

What does this MR do?

Fix diff comment alignment for parallel code additions

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

Screenshots (if relevant)

Before After
2018-06-21_11.13.17 2018-06-21_11.12.39

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/47861

Edited by Clement Ho

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