Add support for line numbering of source code.
Make this an option.
All style in line number, width of "gutter" containing etc, etc to be customised.
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Considering for implementation in a v4 point release.
Deferred to v5 or later.
I'm considering changing syntax highlighter code in CodeSnip 5 which will have an impact on how line numbers are included in source code.
Therefore to introduce this feature in v4.x would mean it would have to be re-implemented in v5. I don't want to have to do this work twice!
Syntax highlighter has now been changed in v5 development tree (code name "parsnip"). Source code editor current always has a gutter, and I'm considering making this an option.