LaTeX3 syntax highlight fails in environments

[SwitWu]

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Pre-checks*

Please change the following [ ] to [x] for confirmation.

• [x] The issue has not been reported in this repository.
• [x] The issue remains after disabling all other extensions and restarting Visual Studio Code.
• [x] The FAQ cannot address the issue.
• [x] The issue is not related to compiling a document, or the document can be successfully compiled in the OS terminal but not in Visual Studio Code with this extension.

Environment*

Please write exact version numbers instead of descriptors such as latest.

• Operating System: [macOS Sonoma 14.4.1]
• Visual Studio Code Version: [1.88.1 (Universal)]
• LaTeX Workshop Version: [latest]
• TeX Distribution Version: [TeX Live 2024]

Please list the environment and version number if you are using VSCodium, Snap or Flatpack versions of Visual Studio Code, and/or Visual Studio Code Remote Containers/SSH/WSL.

The Issue*

Please briefly describe the issue you come across.

LaTeX3/expl3 syntax highlight fails in environments.

Reproduction Steps

Please list out the steps to reproduce your bug. Include relevant environmental variables or any other configuration.

1. creates a.cls
2. add the code

   \int_case:nn
   \begin{center}
   \int_case:nn
   \end{center}

3. The result is

Expected Behavior

What were you expecting to see? Include any relevant examples or documentation links.

I expect the \int_case:nn in center has the right highlight as that out of center.

Logs

LaTeX Workshop Output*

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Developer Tools Console

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Anything Else?

Add any other context about the problem below.

[James-Yu]

Thank you for filing this issue. We have outsourced our LaTeX syntax highlighting grammar to vscode-latex-basics, could you please post your issue there?