Update tests.
Reason: it turns out that the native output generated by
pretty-simple isn't always readable by the native reader.
According to https://github.com/cdepillabout/pretty-simple/issues/99
it is not a design goal of the library that the rendered values
be readable using 'read'. This makes it unsuitable for our
purposes.
pretty-show is a bit slower and it uses 4-space indents
(non-configurable), but it doesn't have this serious drawback.
Previously we used our own homespun formatting. But this
produces over-long lines that aren't ideal for diffs in tests.
Easier to use something off-the-shelf and standard.
Closes#7580.
Performance is slower by about a factor of 10, but this isn't
really a problem because native isn't suitable as a serialization
format. (For serialization you should use json, because the reader
is so much faster than native.)
* Text.Pandoc.Shared: export `htmlSpanLikeElements` [API change]
This commit also introduces a mapping of HTML span like elements that
are internally represented as a Span with a single class, but that are
converted back to the original element by the html writer. As of now,
only the kbd element is handled this way. Ideally these elements should
be handled as plain AST values, but since that would be a breaking
change with a large impact, we revert to this stop-gap solution.
Fixes https://github.com/jgm/pandoc/issues/5796.
