27.0.0: Dragging/dropping of formulas not supported

[tony]

Example (+ copy text issue with #35)

00:15 - 00:25:

https://user-images.githubusercontent.com/26336/117016512-67c73300-acb8-11eb-838e-03714e8994e9.mp4

Drag and drop of inline content:

• Release notes: https://github.com/ckeditor/ckeditor5/blob/master/CHANGELOG.md#2600-2021-03-01
• Migration guide: https://ckeditor.com/docs/ckeditor5/latest/builds/guides/migration/migration-to-27.0.0.html
  • ClipboardPipeline files ClipboardPipeline#inputTransformation, ClipboardPipeline#contentInsertion

Recreation steps

• git clone https://github.com/isaul32/ckeditor5-math.git
• cd ckeditor5-math
• yarn
• yarn start
• http://localhost:8080
• Drag and drop a formula

[Jules-Bertholet]

https://user-images.githubusercontent.com/79955405/117917917-16bace80-b2b8-11eb-9b24-bcc032c006f5.mp4

https://github.com/ckeditor/ckeditor5/pull/9674