Visual Editor loses raw HTML code blocks

[gtritchie]

NOTE: This issue is due to a pandoc change, and also impacts the RStudio IDE (rstudio/rstudio#15189). I am working on a fix for both the IDE and the VSCode extension.

Steps to reproduce the problem

• Using extension version 1.115.0 in VSCode 1.93.1
• Create a new Quarto document, edit in non-visual mode, add following:

---
title: "Raw HTML Block Issue"
format: html
---

Some text.

```{=html}
<p>Put <b>HTML</b> <i>here</i>.</p>
```

This is <b>inline HTML</b>.

Save the file, then Edit in Visual Mode. It looks ok:

Now switch back to source (non-visual) mode.

Describe the problem in detail

The code block is gone, all that is left is the content, but not the surrounding backticks, etc.

---
title: "Raw HTML Block Issue"
format: html
---

Some text.

<p>Put <b>HTML</b> <i>here</i>.</p>

This is <b>inline HTML</b>.

Describe the behavior you expected

Raw HTML blocks should not be removed by the Visual Editor.