Pasting from desktop app into Confluence misses background colours

[DarkTyger]

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Describe the bug
Colours aren't copied when desktop diagram is pasted into drawio Confluence Cloud diagram.

To Reproduce
Steps to reproduce the behavior:

1. Start drawio deskop
2. Create a new drawing
3. Add an arrow
4. Add some text
5. Change the line colour of the arrow
6. Change the background colour of the arrow
7. Group the text and the arrow together (see attached; aside, note that the grouping box is not bounded accurately)
8. Press Control+A to select the entire diagram
9. Press Control+C to copy the diagram
10. Open Confluence
11. Add a new page
12. Type /drawio to insert a new drawio diagram
13. Paste the copied contents into the diagram

Actual
The background colour is incorrect.

Expected behavior
The background colour for the arrow is copied correctly.

Screenshots
If applicable, add screenshots to help explain your problem.

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

• v29.6.1

Desktop (please complete the following information):

• OS: Windows

Additional context

David Benson [draw.io] suggested logging the issue against this tracker.

Here is an example diagram that will not be rendered correctly when pasted into Confluence:

bg-grouped.drawio

The dark green background colour gets swapped for a lighter colour.

Here is a picture showing the issue:

[draw-io-triage-bot]

👋 Thank you for opening this issue!

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Summary: When copying a diagram from the draw.io desktop application and pasting it into a draw.io diagram in Confluence, the background/fill colors of shapes (specifically arrows) are lost or incorrect in the pasted result.

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📝 Additional Information Needed

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

• draw.io version: The user states 'latest' but the exact version number (from Help -> About) would help with tracking and reproducing the issue.
• Confluence version/type: It's unclear whether this is Confluence Cloud or Confluence Data Center/Server, and which version of the draw.io Confluence plugin is being used.
• Screenshots: The user references an attachment showing the grouping but no screenshots are actually included. Before/after screenshots showing the desktop diagram and the pasted result in Confluence would be very helpful.
• Diagram file: An exported .drawio file demonstrating the issue would help developers reproduce it exactly.

We also have some questions:

• Can you provide the exact draw.io Desktop version number from Help -> About?
• Are you using Confluence Cloud or Confluence Data Center/Server, and which version of the draw.io for Confluence plugin?
• Could you attach screenshots showing (1) the original diagram in the desktop app and (2) the pasted result in Confluence, so the color difference is visible?
• Does this issue also occur if you export the diagram as a .drawio file from the desktop app and then import it into the Confluence diagram, rather than using copy/paste?
• Does the issue occur with all shape types, or specifically with arrows/connectors that have a background fill color?

📋 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!}