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The output from "Show Source" produces an ordered list of line numbers with no source in sight. This is likely to be merge-borkage as 0.6.7 touched the relevant bits of code (truncate_line and friends).
Found it. It was merge breakage. I nuked the extra code. Will have to review when it's time to update the CSS and other formatting issues. Source output is just a minimalist dump (ordered list without styling) right now.