Wrong display math syntax highlighting and preview

[memeplex]

Bug description

$$x$$

is being highlighted as:

and in the preview looks like:

This is just an example. Any display math block will fail in similar ways.

Steps to reproduce

Create a qmd file with the content above. Open the math preview.

Actual behavior

As shown above.

Expected behavior

The block is correctly recognized and presented as display math.

Your environment

• IDE: VSCode 1.99.3
• macOS Sequoia 15.1
• Quarto Extension 1.121.0

[memeplex]

I believe the problem is in the syntax definition:

  math_inline:
    name: markup.math.inline.quarto
    match: '(?<=\s|\W|^)(?<!\$)(\$)(.+?)(\$)(?!\$)(?=\s|\W|$)'

Here a potential extern $...$ pair is excluded but nothing is preventing the intern pair to be taken as part of the content itself, which is indeed what ends up happening, as it's easy to check using the token and scopes inspector. I guess the inner group should be replaced by something like ([^$]+?).