rst figure options are applied to image only

[quytelda]

Explain the problem.
When converting a reStructuredText figure directive to HTML, options like figclass and align are only applied to the image and not the entire figure in the output. Based on the reference documentation for figure, I think these options are intended to apply to the entire figure.

For example, if I run the following command:

$ pandoc --from=rst --to=html5 <<EOF
.. figure:: example.img
   :figclass: foobar

   This is a caption.
EOF

I would expect the output to be:

<figure class="foobar">
<img src="example.img" alt="This is a caption." /><figcaption aria-hidden="true">This is a caption.</figcaption>
</figure>

Instead, I get the following, where the class=foobar attribute is part of the img tag.

<figure>
<img src="example.img" class="foobar" alt="This is a caption." /><figcaption aria-hidden="true">This is a caption.</figcaption>
</figure>

This issue causes the image and caption to get separated if the CSS stylesheet tries using something like float to align the figure.

Pandoc version?
I can reproduce this issue with the current development version (git) and pandoc 2.14.0.2 (pacman version: 2.14.0.2-2).
My OS is Arch Linux.

[argent0]

Tangentially I'm working on adding explicit figure representation in pandoc. It doesn't yet work on RST though.

[jgm]

Currently figures are just represented as images in a paragraph, so there isn't anywhere else to add the attributes. This will change when Figure gets added with @argent0's work.

[quytelda]

Great, that's good to know.

Let me know if there's anything I can do to help with that. I'm not really familiar with this codebase, but I've got some time and I enjoy working with Haskell.

[tarleb]

This is now fixed for figclasses, but not for align.