Docs workaround for failing callback() section

[kdipippo]

📑 Summary

Under the Flowchart > Interaction section of the docs, the mermaid snippet for adding callback functions is not working as expected. Expected behavior is for a tooltip to appear on hover and for an alert to appear on click; neither of these behaviors are seen in the docs. In the original issue, I noted that the culprit may be due to the callback() function never being initialized.

Resolves #1294

🐛 Related Bug Investigation

There were a few attempts to get this to work inside the document itself that did not result in successes:

1. In docs/index.html, I pasted the callback() function containing the alert. Running the docs locally, I was able to confirm that the function correctly initializes in console (result below). Clicking on the mermaid element still did not call that function.

typeof callback
> "function"

2. I added securityLevel:'loose' to the mermaid init in docs/index.html; I later also set startOnLoad: true. Neither, coupled with the exposed callback() function, resulted in any changes.
3. I updated the version of mermaid from 8.4.7 -> 8.4.8 in the docs, with no result.
4. My initial hunch involved adding executeScript: true to the docs/index.html config: https://docsify.js.org/#/configuration?id=executescript However, this would only alleviate the issue of having to add all the callback functions from this doc page into the docs/index.html file.

The root cause is one of two issues:

1. Docsify is improperly converting the markdown such that it breaks the callback functionality, based on how that process is set up in docs/index.html.
2. An existing field being passed into mermaid.initialize({}); conflicts with the callback functionality. The first option seems more likely due to only 3 fields being passed here with no obvious culprits.

📏 Design Decisions

As a proposed workaround, I created a fiddle that uses mermaid 8.4.8 and runs the small callback demo, along with a note about these limitations. Screenshot of how this appears:

📋 Tasks

Make sure you

• 📖 have read the contribution guidelines
• 💻 have added unit/e2e tests (if appropriate)
• 🔖 targeted develop branch

[knsv]

Thanks @Pepper-Wood ! This is much appreciated!