Git Blame has Confusing Response

@jivanvl and I were trying to determine how a few lines in our karma.config.js got duplicated and noticed that the "blame" view on GitLab showed the full duplicated section attributed to a single commit:

However, when you inspect the actual commit in question (https://gitlab.com/gitlab-org/gitlab-ce/commit/50b2b3f5f000834144ccf41a4dbe278987b2ef75?view=inline) doesn't show this section duplicated, it just shows it once:

I suspect that it was actually a bad merge conflict resolution or rebase that put the file into this state (with the duplicated lines), but how can one inspect where this code change occurred if our "blame" view isn't up to the task?