Uploading image gets deleted when being dragged and dropped

[Sanderovich]

📝 Provide detailed reproduction steps (if any)

1. Set network throttling to 3G in the developers console. A real scenario would be user having a slow internet connection.
2. Upload an image.
3. Drag and drop the uploading image inside the editor.

Demonstartion of the issue in the CKEditor 5 demo pages:

Screencast from 23-08-24 14:44:17.webm

✔️ Expected result

Image drops and continues uploading.

❌ Actual result

Image is deleted.

📃 Other details

• Browser: Firefox, Chromium. I was not able to test on Safari

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[kubaklatt]

I can confirm that the reported issue is reproducible and valid.

[Mati365]

I proposed fix: https://github.com/ckeditor/ckeditor5/pull/17327