ramnathv/knitr — comment on commit 33a75f40297dc763c1fd1325f12dc83ad2c5ff61
File: R/themes.R line 47
By yihui:

Now I have revised the `chunk` hook so it uses the color `fgcolor` now, so the `output` hook here is no longer needed, i.e. `set_theme()` only needs to reset the background color and the highlight header.

see https://github.com/yihui/knitr/commit/33bc37ae