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Author SHA1 Message Date
John MacFarlane
48c88d566d Add space_in_atx_header extension.
This is enabled by default in pandoc and GitHub markdown but not the
other flavors.

This requirse a space between the opening #'s and the header
text in ATX headers (as CommonMark does but many other implementations
do not).  This is desirable to avoid falsely capturing things ilke

    #hashtag

or

    #5

Closes #3512.
2017-03-20 21:55:30 +01:00