Mermaid code blocks are not rendered by the extension, while VS Code's native Markdown preview renders them correctly

[Tanishq-JM]

Bug Report

Summary

The extension does not render Mermaid code blocks in Markdown, even though the exact same Markdown is rendered correctly by VS Code's native Markdown preview.

This creates inconsistent behavior between the built-in renderer and the extension. Since Mermaid support is already available natively in VS Code, I expected the extension to render the diagrams as well.

Expected Behavior

Mermaid code blocks should be rendered as diagrams, matching the behavior of VS Code's native Markdown preview.

Actual Behavior

The extension displays the Mermaid code block as plain text (or does not render it at all), while the native VS Code Markdown preview renders the diagram correctly.

Steps to Reproduce

1. Open a Markdown file.
2. Add a Mermaid code block, for example:

```mermaid
graph TD
    A[Start] --> B[Process]
    B --> C[End]
```

3. Open the Markdown using the extension's preview/rendering feature.
4. Observe that the Mermaid diagram is not rendered.
5. Open the same file using VS Code's native Markdown Preview.
6. Observe that the Mermaid diagram renders correctly.

Expected Result

Both the extension and VS Code's native Markdown preview should render the Mermaid diagram identically.

Actual Result

Only the native Markdown preview renders the diagram. The extension fails to render it.

Additional Information

This appears to be a missing or incomplete Mermaid rendering implementation in the extension. Since VS Code already supports Mermaid diagrams natively, it would be great if the extension could provide equivalent rendering behavior for compatibility and consistency.

Thank you for looking into this issue.

[benjikj-cera]

I've found problems with this too now. I think something must have changed though, as previously rendering mermaid diagrams (from only a few weeks ago) are now not rendering. Is this a GitHub bug or just a change in feature to remove mermaid or something?

[hediet]

It seems to have issues when diagrams are rendered for the first time.

[benjikj-cera]

It seems to have issues when diagrams are rendered for the first time.

@hediet Does this mean it will work after some refreshes or something? I can't get it to work at all.

[Tanishq-JM]

It seems to have issues when diagrams are rendered for the first time.

@hediet Does this mean it will work after some refreshes or something? I can't get it to work at all.

Sort of. It only renders after I edit it & Save it; it doesn't render on the initial load.