We need to generate a span when the header's ID doesn't match
the one MediaWiki would generate automatically. But MediaWiki's
generation scheme is different from ours (it uses uppercase letters,
and `_` instead of `-`, for example).
This means that in going from markdown -> mediawiki, we'll now get
spans before almost every heading, unless explicit identifiers are
used that correspond to the ones MediaWiki auto-generates.
This is uglier output but it's necessary for internal links to
work properly.
See #7697.
This improves on the original fix to #5285 by preventing
other mixed lists (lists with a mix of Plain and Para
elements) that were allowed given the original fix.
Captions used to have the word 'caption' prepended; this
has been removed.
Also, 'thumb' is used instead of 'frame' to allow images
to be resized.
Closes#5105.
This is now the default for pandoc's Markdown.
It allows whitespace between the two parts of a
reference link: e.g.
[a] [b]
[b]: url
This is now forbidden by default.
Closes#2602.
