Bug: GitHub-flavored alerts cannot be nested (with errors)

[shigma]

Describe the bug

• Blockquotes can be nested.
• Custom blocks can be nested.
• But GitHub-flavored alerts cannot (with errors).

> case 1
>
> > nested content

:::: tip
case 2

::: warning
nest content
:::
::::

> [!TIP]
> case 3
>
> > [!WARNING]
> > case 3

Reproduction

https://stackblitz.com/edit/vite-alzhrt?file=docs%2Fexample.md

Expected behavior

Render without errors.

System Info

N/A

Additional context

No response

Validations

• Check if you're on the latest VitePress version.
• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.

[brc-dd]

This isn't supported on GitHub either. We can avoid throwing error and just render blockquote though.

[shigma]

I'm willing to have a try if you can accept this feature.

[meduzen]

FYI, and as GitHub doesn’t do it automatically, I’ve referenced this issue in discussion #3540.