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Fix Mermaid flowchart rendering #35

Description

@schuyler

Problem

Flowchart diagrams using Mermaid syntax fail to render properly, despite flowcharts being a core Mermaid feature since its inception in 2014.

Example

graph TD
    A[Start] --> B[Process]
    B --> C[End]
Loading

This does not render in MacDown v0.8.0d71.

Impact

  • Breaks diagram functionality for documentation
  • Flowcharts are one of the most common Mermaid diagram types
  • Subsequent diagrams may also break after a failed flowchart

Source

Based on issue #1343 from MacDownApp/macdown
MacDownApp/macdown#1343

Priority

HIGH - Core functionality for technical documentation

Implementation Notes

  • Review Mermaid library version and configuration
  • Test various flowchart syntaxes
  • Related to issue about updating Mermaid to v11

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    bugSomething isn't workingcloned-issuediagramshighImportant for release, significant impactv0.1Must have for v0.1 release

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