savestate is not the right place to write wiki content, and in particular
this breaks websetup if osm's dependencies are not installed, even if
the osm plugin is not actually enabled. (Closes: #719913)
This is not a full solution: it should be possible to render the PoI files
for only the maps that changed, from the format, changes or rendered
hook. However, getting that right would require more understanding of
this plugin, and this version is enough to not break websetup. This
version is the closest correct hook to the one where this previously
took place.
This still smuggles it past the sanitize step, but avoids having
other plugins that want to capture text content without markup
(notably toc) see the CSS as if it was text content.
reasoning: if headings have identifiers, they are probably more useful
anchors than the automatically generated anchors we build in the toc
plugin. this can happen if, for example, you use the `multimarkdown`
plugin, which inserts `id` tags for every header it encounters. this
also leverages the `headinganchors` plugin nicely.
keeps backwards-compatibility with old toc-generated #indexXhY
anchors.
This avoids misinterpreting initials ("C. S. Lewis was an author"),
the abbreviation for Monsieur ("M. Descartes was a philosopher") and
German page numbering ("S. 42") as ordered lists if they happen to
begin a line.
This only affects the default Discount implementation: Text::Markdown
and Text::MultiMarkdown do not have this feature anyway. A new
mdwn_alpha_list option can be used to restore the old interpretation.
The Perl binding defaults to MKD_NOHEADER|MKD_NOPANTS anyway, but
making them explicit means we can use other flags of our choice,
and makes it easier to justify why those flags are appropriate.