Markup in code blocks and backslash escape not working

[JohnHind]

I have a markup file which builds fine in MarkupPad, but here I get random 'strong' tags in the output. This is due to recognizing double-underscores inside 'code' markup (both backtick and indented forms). I do not think this is correct.

I also tried escaping the underscores with backslashes. This stopped them being interpreted as emphasis markup, but the backslashes themselves were not removed from the output - this is definitely incorrect (and useless!)