Fix JSON syntax highlighting #335
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- didn't work with latest version of pygments. Add unit tests that force syntax highlighting - Sno output in unit tests is otherwise always colour-free.
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which didn't work with latest version of pygments.
Specifically, pygments.lexers.JsonLexer was changed to not be a RegexLexer and rewritten to be almost stateless. Sno code to copy state from one JSONLexer call to the next for streaming+highlit JSON output was no longer applicable.
Updated this code to work with the new JsonLexer.
Added unit tests that force syntax highlighting - Sno output in unit tests is otherwise always colour-free.