yihui/knitr — pull request #742 by Thell (2014-03-29 18:53:00+00:00)
Title: hooks-md.R: Only collapse matched back-ticks.

- Ensure the fence is alone on the line and lengths are equal before
collapsing.

Signed-off-by: Thell Fowler

I didn't see any tests for chunk params so it is omitted.