5460 - Initial Release for review

[darkedges]

#5460
This adds Markdown support for SequenceDiagram notes Needs cleanup.

📑 Summary

This adds Markdown support for notes and syntax highlighting.

Resolves #5460

📏 Design Decisions

Updates the Parser to include support dor multline end support.
Detects if it fins Markdown and uses the Markdown renderer to geneate text.
Follows the same pattern as katexsupport.

📋 Tasks

Make sure you

• [x ] 📖 have read the contribution guidelines
• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
• [ x] 🔖 targeted develop branch

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[darkedges]

I need some help cleaning up the parser as that is currently breaking checkins.

Conflict in grammar: multiple actions possible when lookahead token is TXT in state 116
- reduce by rule: note_section -> 
- shift token (then go to state 120)

States with conflicts:
State 116
  note_statement -> note placement actor .text2 #lookaheads= NEWLINE
  note_statement -> note placement actor .note_section end #lookaheads= NEWLINE
  text2 -> .TXT
  note_section -> . #lookaheads= end ACTOR TXT NEWLINE
  note_section -> .note_section note_line #lookaheads= end ACTOR TXT NEWLINE
Conflict in grammar: multiple actions possible when lookahead token is TXT in state 116
- reduce by rule: note_section ->
- shift token (then go to state 120)

States with conflicts:
State 116
  note_statement -> note placement actor .text2 #lookaheads= NEWLINE
  note_statement -> note placement actor .note_section end #lookaheads= NEWLINE
  text2 -> .TXT
  note_section -> . #lookaheads= end ACTOR TXT NEWLINE
  note_section -> .note_section note_line #lookaheads= end ACTOR TXT NEWLINE

also need to include the css requied for highligthing.

[knsv-bot]

Hi @darkedges — thanks for taking a run at adding Markdown to sequence-diagram notes (#5460). This stalled at the grammar-conflict stage and hasn't moved since, and in the meantime the effort has been carried forward elsewhere (see #5705 and the broader work to migrate string handling onto the shared markdown approach). Rather than leave a branch that doesn't build, I'm going to close this. The feature itself is still wanted — #5460 remains open — and that migration is where it'll ultimately land. Thanks for the effort! 🙇