Do not accept footnote definitions with line breaks #761
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This change brings pulldown-cmark into alignment with [markdown-it] and hugo/goldmark. It's close to GitHub, but GitHub [doesn't parse the backslashes as hard line breaks][gist]. It's odd that link reference definitions are allowed to have line breaks and footnote definitions aren't, but it's not worth it to be gratuitously different. [markdown-it]: https://markdown-it.github.io/#md3=%7B%22source%22%3A%22%5B%5Efoo%5C%5C%5Cnbar%5D%3A%20not%20a%20footnote%20definition%5Cn%5Cn%5Bbaz%5C%5C%5Cnquux%5D%3A%20https%3A%2F%2Frust-lang.org%5Cn%5Cn%5Bfirst%5Cnsecond%5D%3A%20https%3A%2F%2Frust-lang.org%5Cn%5Cn%5B%5Ethird%5Cnfourth%5D%3A%20not%20a%20footnote%20definition%5Cn%5Cn%5Bbaz%5C%5C%5Cnquux%5D%5Cn%5B%5Efoo%5C%5C%5Cnbar%5D%5Cn%5Bfirst%5Cnsecond%5D%5Cn%5B%5Ethird%5Cnfourth%5D%22%2C%22defaults%22%3A%7B%22html%22%3Afalse%2C%22xhtmlOut%22%3Afalse%2C%22breaks%22%3Afalse%2C%22langPrefix%22%3A%22language-%22%2C%22linkify%22%3Atrue%2C%22typographer%22%3Atrue%2C%22_highlight%22%3Atrue%2C%22_strict%22%3Afalse%2C%22_view%22%3A%22html%22%7D%7D [gist]: https://gist.github.com/notriddle/7fd2410a2585123ad0f894b08c58b21f
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Fixes #760
This change brings pulldown-cmark into alignment with markdown-it and hugo/goldmark. It's close to GitHub, but GitHub doesn't parse the backslashes as hard line breaks.
It's odd that link reference definitions are allowed to have line breaks and footnote definitions aren't, but it's not worth it to be gratuitously different.