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Image drag & drop extremely sluggish in Firefox 109 #13366

@tmiller02

Description

@tmiller02

📝 Provide detailed reproduction steps (if any)

  1. Open the CKEditor 5 image demo page at https://ckeditor.com/docs/ckeditor5/latest/features/images/images-overview.html in Firefox 109.0.1
  2. Click the image and drag it around the document

✔️ Expected result

The caret should move around the page quickly to show where the image will be dropped

❌ Actual result

The caret moves extremely slowly, lagging behind the movement of the cursor by several seconds

📃 Other details

This issue may be related to changes to dataTransfer.files in Firefox - https://bugzilla.mozilla.org/show_bug.cgi?id=1812611

Here's the stack chart while dragging the image:

Screenshot 2023-01-31 at 4 46 52 pm

  • Browser: Firefox 109.0.1
  • OS: macOS 12.6.2

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squad:coreIssue to be handled by the Core team.type:bugThis issue reports a buggy (incorrect) behavior.

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