Manual decorators for LinkImage lost upon upcast

[wimleers]

📝 Provide detailed reproduction steps (if any)

Discovered while working on https://www.drupal.org/project/ckeditor5/issues/3247683.

1. Load the following CKE5 plugins: image.Image, image.ImageToolbar, image.ImageUpload, link.Link, link.LinkImage, with the following Link config:

"{"decorators":[{"mode":"manual","label":"Foobarize","attributes":{"foo":"bar"}}]}"

2. Instantiate CKEditor 5 on a textarea containing markup like:

<p><a href="http://www.drupal.org/association" foo="bar">test link</a> and <a href="http://www.drupal.org/association" foo="bar"><img src="/sites/default/files/inline-images/dark_14.png"></a></p>

🎥 Screencast

✔️ Expected result

Same markup as before, with foo="bar" retained on both the linked text and the image.

❌ Actual result

foo="bar" is retained only on the linked text not on the image.

❓ Possible solution

Bug in upcasting.

📃 Other details

• Browser: N/A — reproduced in Chrome and Firefox.
• OS: N/A — reproduced in macOS Big Sur
• First affected CKEditor version: v31.0.0
• Installed CKEditor plugins: see above.

---

If you'd like to see this fixed sooner, add a 👍 reaction to this post.

[wimleers]

#6571 seems related?

[rmaxx]

👍seeing same results on link classes after installing imagelink plugin