Bug Confirmation: Ampersand (&) Not Rendering Correctly in MindMap

I have tested this issue and confirm that the ampersand (&) character is incorrectly rendered in MindMap diagrams due to double encoding (& → & → &). Instead of displaying "S&P Markit EDM", the output appears as "S&P Markit EDM", leading to incorrect text display.

The issue was tested using two different MindMap structures:
First Test: Simple MindMap Structure

• Code Used:
  mermaid mindmap root((Domain)) Domain Specific Tools Markit EDM["S&P Markit EDM"]

Second Test: Extended MindMap with Nested Nodes

• Code Used:
  mermaid mindmap root(("S&P Global")) Domain Specific Tools S&P Data Markit EDM["S&P Market Research"]

• Observation: The issue persists across:
  • Root node text (S&P Global).
  • Sub-nodes without brackets (S&P Data).
  • Bracket-wrapped labels (S&P Market Research).

Additional Findings

• This bug only affects MindMaps. It does not occur in:
  • Flowcharts
  • Sequence Diagrams
  • Gantt Charts
  • Pie Charts
  • Entity-Relationship Diagrams : Fails due to syntax error on &

A probable cause could be that text is being encoded:

1. During data storage or parsing – In mindmapDb.ts, where node text is stored and processed before rendering.
2. Within the rendering pipeline – In mindmapRender.ts or svgDraw.ts, where additional transformations might be applied before displaying the text in an SVG element.
3. As part of a global escaping function – If MermaidJS applies a text sanitization function as part of its universal rendering process, MindMaps might be unintentionally inheriting redundant encoding logic.

Hi @awhitford,

I have implemented a fix to properly render the ampersand (&) character in mind maps. Previously, the ampersand was being double-encoded (& → & → &), which resulted in incorrect rendering.

Before and After Screenshots

After

Pull Request: #6315

Changes and Fix

• Adjusted the text rendering logic to ensure & is correctly displayed.
• This fix should also apply to other diagrams using similar text processing, but the primary focus was on mindmaps.

Pending Argos Snapshot Approval

There are Argos visual test changes awaiting approval due to this fix. The updated snapshots correctly reflect the fixed ampersand rendering. A reviewer with the right permissions needs to approve these changes to move forward.

Let me know if you have any questions or if any additional refinements are needed. Thank you for reporting this issue, and I look forward to your feedback