Mermaid Edit Facilitation

[megamorphg]

• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a feature request that matches the one I want to file, without success.

Is your feature request related to a problem? Please describe.
When editing a Mermaid diagram in the desktop (select the diagram and then press Enter) it presents a small window to edit and Apply the edit.

Describe the solution you'd like
Provide more robust Mermaid code editor within Draw.IO with:

• Larger/re-sizeable editor
• Syntax highlighting

Additionally it would be great if edits could be made without having to press Enter on the Mermaid object by having a tab in the Properties sidebar dedicated to editing the syntax and an Apply button similar to the pop-up. This would help the user make edits to the Mermaid diagram more rapidly with fewer clicks and presses.

Describe alternatives you've considered
Use VS Code or online mermaid diagram tool. This of course requires an additional app and copy-pasting between app, divorced from the Draw.IO program.