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Description
I create a new text file in Code, select type as Mermaid and open the mermaid preview.
Then I click inside the text file and paste some mermaid code.
As troubleshooting steps, I tried moving code to each of my three monitors, but nothing changed.
Expected behaviour
Preview works
sequenceDiagram
Alice->>+John: Hello John, how are you?
Alice->>+John: John, can you hear me?
John-->>-Alice: Hi Alice, I can hear you!
John-->>-Alice: I feel great!```
### Actual behaviour
Preview does not work
Include:
* Screenshot 
* Preview mode: Mermaid
* Theme used: dark
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