Punctuation after inline math allows line-breaks

[rowanc1]

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For example (see second line):

Possible improvements:

• https://github.com/KaTeX/KaTeX/issues/1233#issuecomment-851040169

These could be run at build time for the elements. I need to investigate a bit more about the consequences of that. We could also only run this if the inlineMath is followed by punctuation to limit the knock on effects.

cc @cpraveen