miyuchina / mistletoe / 5849195737

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fix: escape special characters in URLs (#190)

If `\url{}` is used within LaTeX macros like `\multicolumn` and if the
link to be rendered contains `#` or `%` as typical confluence links like
https://site.com/confluence/display/TEST/TEST-042%3A+Foo#target are
bound to, pdflatex (from TeX Live 2019) fails with errors. This patch
fixes that by escaping these two characters.

NB: if `\url{}` with such links is used outside of multicolumn-macros,
they work regardless of whether these characters are escaped, and the
result remains the same.

Additionally, make the LaTeX renderer %-quote unsafe chars in urls like
other renderers do (e.g.,  in Jira and XWiki renderers).

Resolves #114.

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