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Author SHA1 Message Date
John MacFarlane
741b1f7fb4 Markdown reader: fix small super/subscript issue.
Superscripts and subscripts cannot contain spaces,
but newlines were previously allowed (unintentionally).
This led to bad interactions in some cases with footnotes.
E.g.

```
foo^[note]
bar^[note]
```

With this change newlines are also not allowed inside
super/subscripts.

Closes #5878.
2019-11-11 09:08:52 -08:00