The code for detection of lines in highlight.go is somewhat too complex
and doesn't take account of how Chroma is actually splitting things into
lines for us.
Remove both the .line and .cl classes from Chroma's HTML which made
the old conditional work again. This fixed Copy of YAML files while also
reducing the amount of rendered HTML nodes.
Co-authored-by: zeripath <art27@cantab.net>
Co-authored-by: Lauris BH <lauris@nix.lv>
wxiaoguang