Character entities such as   in sequence diagrams trigger diagram syntax error

[billfrost]

Describe the bug
Live editor shows diagram syntax error when the diagram body contains character entities like    
The entities are correctly interpreted inside a web page

 element when loading Mermaid from the CDN.

To Reproduce

Link to Live Editor: https://mermaid.live/edit#pako:eNo1jTEKwzAMRa9iNHRKLuBCpvYEXbXItpIaYjm15SGE3L2GNtv78D7vAJ8Dg4XKn8bi-RFpKZRQaBynyVlDRrO5iavb3cEAiUuiGPrjQDEGQd-cGMF2DDxTWxUB5exq2wIpP0PUXMBqaTwANc2vXfy1f84_CnamtfL5BZdIMv8
Steps to reproduce the behavior:

Paste the following into a new live editor panel:

sequenceDiagram

a-->>b: a to  b

Expected behavior

Character entities should not trigger syntax errors when the Mermaid code from the CDN honours them correctly.