Problems With RMarkdown & HTMLWidgets

OK, so in working on various RMarkdown stuff, I‘ve just run across a problem with it no longer rendering HTMLWidget stuff in the recent upgrade. So if you use something like `mermaid` or `leaflet` in your `xaringan` presentation, it will show you the raw

<div></div>

output instead of the actual widget. This is not an easy one to track down online because the RMarkdown & Xaringan Github sites do not address it. So I thought I would insert a thing here so I can find it next time I need it.

As it turns out, we need to set an option in the setup chunck as follows:

options(htmltools.preserve.raw = FALSE)

This will fix things until RStudio fixes the markdown problems and the world can get back to normal.