cf: https://stg.pagure.io/pagure/pull-request/9#request_diff
It looks like we were using pgyments here for the diff highlighting. And not sure using highlight.js here is going to work real well, (without re-doing the entire thing -- see issue #3488)
The stop-gap here is probably to implement out own basic diff syntax highlighting -- diffs are pretty easy to do.
Metadata Update from @ryanlerch: - Issue assigned to ryanlerch
Commit 19dc17a0 fixes this issue