Rendering charts without the mermaid class

[JeremyCanfield]

Line 95 in mermaidediting.ts sets class to language-mermaid.

const code = writer.createContainerElement( 'code', {
  class: 'language-mermaid'
});

Which causes CKEditor to create HTML that has class="language-mermaid", something like this.

<pre>
  <code class="language-mermaid">
    flowchart TB
    A --> B
  </code>
</pre>

Lines 102 - 110 in sample/index.html have the following HTML, which has both the mermaid and language-mermaid classes, which seems to suggest that both classes should be in <code>.

<pre>
  <code class="mermaid language-mermaid">
    flowchart TB
    A --> B
  </code>
</pre>

If I have an HTML page with the following, the Mermaid flowcharts are not rendered, and instead the raw HTML is displayed. I suspect this is happening because the mermaid class is not included. I'm not sure how to get the Mermaid flowcharts to render.

<pre>
  <code class="language-mermaid">
    flowchart TB
    A --> B
  </code>
</pre>

<script type="module">
  import mermaid from 'https://cdn.jsdelivr.net/npm/mermaid@11/dist/mermaid.esm.min.mjs';
  mermaid.initialize({ startOnLoad: true });
</script>