[CKEditor 5] Fixing typos with "Proofread in dialog" feature breaks undo

[mlewand]

Steps to reproduce

1. Open https://webspellchecker.com/wsc-proofreader/#proofreader-ckeditor5
2. Make sure you're using CKEditor 5 example.
3. Type "foo " at the beginning of the text.
4. Open "Proofread in dialog" feature
5. Correct hapen -> happen
6. Click "finish checking" button.
7. Press undo button multiple times.

Expected

Initial content of the document is restored.

Actual

Nothing is changed.

[jshaptala]

We use editor.setData() for the Finish Checking functionality in the Proofread in dialog mode. All the data from the dialog is transferred to an editable field using editor.setData().

Does internal CKEditor 5 editor.setData() add Undo record? If so, could you please suggest what we can use to return data from the dialog to the editor for the correct work with Undo?

[jshaptala]

@mlewand would you please take a look at our question below?

Does internal CKEditor 5 editor.setData() add Undo record? If so, could you please suggest what we can use to return data from the dialog to the editor for the correct work with Undo?