rectangle and line style conflict

[GreatDit2025]

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Describe the bug
When drawing a rectangle, the text within it should have no background. This is so I can change the fill of the entire rectangle without changing the text background. I draw a filled rectangle and set the text background to transparent. I save this in the default style.
Then I need to draw lines and label them. The text on the lines should have a background so the line doesn't interfere with the letters. I draw a line and set the text background to opaque. I save this in the default style. This messes up the default style for the rectangle.
This was done well in older versions, but now it's a pain: constantly redoing the background for the labels.

• draw.io version v29.6.10

[draw-io-triage-bot]

👋 Thank you for opening this issue!

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Summary: The user reports that setting a default style for text label backgrounds on lines (opaque) conflicts with and overrides the default style for text label backgrounds on rectangles (transparent), which they believe worked independently in older versions of draw.io.

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📝 Additional Information Needed

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

• platform: Whether this is draw.io desktop, web (app.diagrams.net), or a plugin (Confluence, etc.)
• steps_to_reproduce: Exact step-by-step instructions to reproduce the issue, including which menu options are used to 'save in the default style' and the exact sequence of operations that causes the conflict.
• screenshots_or_styles: Screenshots showing the before/after behavior, or the actual style strings involved (right-click shape > Edit Style) for both the rectangle and the line, would help clarify the issue.
• expected_vs_actual: Clarification on whether the issue is that setting a default style for lines overwrites/shares settings with the default style for rectangles, or something else.
• previous_version: Which older version worked correctly? This would help identify when a regression may have been introduced.

We also have some questions:

• When you say 'save this in the default style,' are you using 'Edit Style' > 'Set as Default Style' from the right-click context menu, or are you using a different method?
• Is the core issue that draw.io now shares a single 'label background' default style property between shapes (rectangles) and connectors (lines), whereas previously they were independent?
• Could you share the exact style strings for your rectangle and line? You can get these by right-clicking the shape/line and choosing 'Edit Style.' This would help pinpoint which style property is being overwritten.
• Which older version of draw.io worked as expected for you, so a regression point can be identified?

📋 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!}

[alderg]

By default, text inside a rectangle has no background.

[GreatDit2025]

Let me explain in more detail:
I have a rectangle with the "text with no background" style. All the lines with arrows from it will also have the "text with no background" style, meaning the text on the arrows will be overwritten by the arrow itself. This is unsightly.
If I select a line with an arrow and set the "text with background" style, it will look nice. To avoid having to change the style for each new line, I click the "Set Default Style" button. Now all new lines will have the "text with background" style – BINGO! But now the style of the new rectangles is broken, and they will have the "text with background" style. When I recolor a new rectangle, the text background will look very unsightly and will need to be changed as well. This is very annoying when drawing large flowcharts. If I save the default style for the rectangles again, the default style for the lines is broken again.

The problem is that draw.io now uses a single "label background" style property by default for all shapes (rectangles) and connectors (lines), whereas previously they were independent of each other.

I use the web version https://app.diagrams.net/ . Previously, in older versions, this problem didn't exist until the "Set as Default Style" button was added.

[GreatDit2025]

По умолчанию текст внутри прямоугольника не имеет фона.

Причём тут это?