7194 : fix for markdown processing to KaTeX text to preserve newlines

[omkarht]

📑 Summary

This PR fixes the issue where newlines were not being rendered in flowchart nodes containing KaTeX math equations. The fix ensures that markdown processing (which converts \n to <br/> tags) is applied to text with KaTeX, allowing newlines to work correctly in both plain text and markdown-formatted nodes with math equations.

Resolves #7194

📏 Design Decisions

Describe the way your implementation works or what design decisions you made if applicable.

📋 Tasks

Make sure you

• 📖 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.
• 🦋 If your PR makes a change that should be noted in one or more packages' changelogs, generate a changeset by running pnpm changeset and following the prompts. Changesets that add features should be minor and those that fix bugs should be patch. Please prefix changeset messages with feat:, fix:, or chore:.

[changeset-bot]

🦋 Changeset detected

Latest commit: a2698a7

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
mermaid	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[netlify]

✅ Deploy Preview for mermaid-js ready!

Name	Link
🔨 Latest commit	a2698a7
🔍 Latest deploy log	https://app.netlify.com/projects/mermaid-js/deploys/6929a3619b9e200008f38bb3
😎 Deploy Preview	https://deploy-preview-7202--mermaid-js.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[pkg-pr-new]

Open in StackBlitz

@mermaid-js/examples

npm i https://pkg.pr.new/mermaid-js/mermaid/@mermaid-js/examples@7202

mermaid

npm i https://pkg.pr.new/mermaid-js/mermaid@7202

@mermaid-js/layout-elk

npm i https://pkg.pr.new/mermaid-js/mermaid/@mermaid-js/layout-elk@7202

@mermaid-js/layout-tidy-tree

npm i https://pkg.pr.new/mermaid-js/mermaid/@mermaid-js/layout-tidy-tree@7202

@mermaid-js/mermaid-zenuml

npm i https://pkg.pr.new/mermaid-js/mermaid/@mermaid-js/mermaid-zenuml@7202

@mermaid-js/parser

npm i https://pkg.pr.new/mermaid-js/mermaid/@mermaid-js/parser@7202

@mermaid-js/tiny

npm i https://pkg.pr.new/mermaid-js/mermaid/@mermaid-js/tiny@7202

commit: a2698a7

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 3.56%. Comparing base (614129c) to head (a2698a7).

Files with missing lines	Patch %	Lines
packages/mermaid/src/rendering-util/createText.ts	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #7202      +/-   ##
==========================================
- Coverage     3.56%   3.56%   -0.01%     
==========================================
  Files          473     473              
  Lines        47566   47568       +2     
  Branches       734     734              
==========================================
  Hits          1696    1696              
- Misses       45870   45872       +2     

Flag	Coverage Δ
unit	3.56% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/mermaid/src/rendering-util/createText.ts	0.45% <0.00%> (-0.01%)	⬇️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[argos-ci]

The latest updates on your projects. Learn more about Argos notifications ↗︎

Build	Status	Details	Updated (UTC)
default (Inspect)	⚠️ Changes detected (Review)	1 changed, 5 added	Nov 28, 2025, 1:38 PM