asciimath formula renders new line before operator

[cdp224]

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Describe the bug

Rendering asciimath formulas results in the inserstion of extra new-lines. This happens with text-labels for lines. Rendering using a stand-alone text works.

To Reproduce

Environment:

• Web-Application: v29.3.4
• Browser: Edge 143.0.3650.139

Steps to reproduce the behavior:

1. Createa new drawing
2. Enable rendering of mathematical formulas
3. Create a text and enter 1+1
4. Correct formula 1+1 shows
5. Create a line
6. doubleclick on the line and enter 1+1
7. Incorrect rendering: 1 new-line +1

expected_behavior: No extra new line would have been expected in that case. This behavior is new compared to older versions (unknown version).

If applicable, add screenshots to help explain your problem.

draw.io version (In the Help->About menu of the draw.io editor):

• draw.io v 29.3.4

Desktop (please complete the following information):

• OS: [e.g. iOS]
• Browser [e.g. chrome, safari]
• Browser Version [e.g. 22]

Smartphone (please complete the following information):

• Device: [e.g. iPhone6]
• OS: [e.g. iOS8.1]
• Browser [e.g. stock browser, safari]
• Version [e.g. 22]

I tested the problem in incognito/private mode with all browser extensions switched off, write "yes" below:

Additional context
Add any other context about the problem here.

[draw-io-triage-bot]

👋 Thank you for opening this issue!

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Summary: User reports that asciimath formulas render incorrectly with extra newlines when used as line labels, while the same formulas render correctly in standalone text elements.

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📝 Additional Information Needed

To help us investigate this more effectively, could you please provide:

• incognito_test: User did not confirm testing in incognito/private mode with extensions disabled
• desktop_info: Desktop OS and browser version information is incomplete (shows placeholder text)
• expected_behavior: User should explicitly state what the expected rendering should look like for line labels

We also have some questions:

• Can you confirm you've tested this issue in incognito/private mode with all browser extensions disabled?
• Does this issue occur with other asciimath formulas on line labels, or only with simple expressions like '1+1'?
• Have you tried this with different types of connectors/lines, or does it happen with all line types?
• Can you share the exact steps to enable mathematical formula rendering (for reproduction purposes)?

📋 Bug Report Template

**Environment:**
- draw.io version: [e.g., web app / desktop 24.x.x / Confluence plugin]
- Browser (if web): [e.g., Chrome 120, Firefox 121]
- OS: [e.g., Windows 11, macOS 14, Ubuntu 22.04]

**Steps to Reproduce:**
1. Go to ...
2. Click on ...
3. See error

**Expected Behavior:**
What you expected to happen.

**Actual Behavior:**
What actually happened.

**Screenshots/Files:**
If applicable, add screenshots or attach the .drawio file.

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_{🤖 This is an automated response to help with initial triage. A human maintainer will review this issue. If you've provided all the requested information, no further action is needed - we'll get back to you soon!}