Multiplex + markdown header issue.

[Carreau]

Hi there,

I have an edge case issue with Markdown & multiplex, I might be doing things wrong.
Basically I have a markdown/latex multiplexed mode, and the following sequence seem to be parsed wrongly by the mode:

# Header

$some math$ text that should not be header but appear to be

I define my mixed mode as follow:

CodeMirror.multiplexingMode(
    CodeMirror.getMode(config, "gfm"),
    {open: "$", close: "$",
     mode: CodeMirror.getMode(config, "stext"),
     delimStyle: "delimit"}
  )

and I made a minimal reproductible example here: Carreau@252ba18

And here is a screenshot if it can be clearer.

I'm not sure if it is bug/feature/unattended side effect/me missuderstandding mixed mode

Thanks !

[marijnh]

The markdown doesn't see the start of the line, because that part of the stream is multiplexed to the stex mode. I've pushed a patch that makes the markdown mode more robust in this case, but in general, multiplexing has its dangers -- it'll hide part of the stream from the multiplexed modes, which some modes don't handle well.

[Carreau]

Thank you very much !