cross-page shortcode dependencies

[cscheid]

The bug reported here is a quarto bug.

If a snippet of a page gets "transplanted" to a different page because of a listing, then shortcode dependencies that are induced by that snippet need to be carried to the listing page. In this case, it's the fontawesome shortcode, but that problem will come up more generally.

We're probably detecting the shortcodes "too early" in the process, before the snippets are included, and so we're missing the snippet contents.

[dragonstyle]

The issue is even more annoying in this case - we're using the rendered HTML of the listing subpages to capture the description (we literally go open the HTML and pull out what we're looking for), so the listing page isn't literally executing the markdown / shortcodes at all and really has no way of knowing they were ever there.