[BUG]: Nested Admonitions

[lebalz]

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• [x] I have searched for similar issues in both open and closed tickets and cannot find a duplicate.
• [x] I have read the documentation and cannot find an answer.

Describe the bug A valid MDX with nested Admonitions is displayed correctly, but it can not be created over the toolbar - no option to insert a new admonition when the focus is already inside a admonition.

Reproduction Start from https://codesandbox.io/p/sandbox/mdx-editor-base-q8s7zr?file=/src/App.tsx to reproduce the problem so that I can observe the issue on my side and make sure that the fix reliably addresses it.

To Reproduce Steps to reproduce the behavior:

1. Go to https://mdxeditor.dev/editor/demo
2. Go to the diff' viewer
3. Insert a nested admonition, e.g. the one from here https://docusaurus.io/docs/markdown-features/admonitions#nested-admonitions
4. Switch back to the Richt Text Mode and see that it works
5. Focus inside an Admonition
6. Bug: the toolbar does not show the option to insert another admonition

Expected behavior A clear and concise description of what you expected to happen.

Step 6: Would be wonderful to insert nested admonitions :)

Screenshots

Desktop (please complete the following information):

• OS: Windows.
• Browser Chrome, Edge, Firefox

Additional context Add any other context about the problem here.

[petyosi]

This is an intentional design of the toolbar item; a nested admonition UI can easily get messy. You can easily do a toolbar item that does what you describe if you want to, just follow the source of the current one.