MathJax images get uploaded in triplicate?

[schanzer]

UPDATE: this is a bug in the markdown parser itself! I've filed an issue with them, and hopefully they'll push a fix soon.

No, it's not. This seems to be related to the way custom-fence works. The issue with the second example below is that without the newline the math should be treated as an inline element, instead of a block. But custom-fence seems to do some weird things with inline stuff.

• Find out how to get custom fence to work properly with inline. Maybe it doesn't!! Maybe we need a new plugin for this? Or make our own?

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Reported by @retabak The following markdown results in three copies of the image being uploaded -- but only when the line before MathJax is non-empty

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# PASS

Just upload one copy, thanks to the space below

$$$ math
1
$$$

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# FAIL

Upload three copies, thanks to the _lack_ of space below
$$$ math
1
$$$