Autoformat creates additional undo steps

[Mgsy]

🐞 Is this a bug report or feature request? (choose one)

• Bug report

💻 Version of CKEditor

Latest master.

📋 Steps to reproduce

1. Go to http://localhost:8125/ckeditor5-core/tests/manual/article.html.
2. Type something using autoformatting, i.e. *test*.
3. Undo few times.

✅ Expected result

After first undo, styling is lost.

❎ Actual result

Nothing happens, there are empty undo steps.

📃 Other details that might be useful

Notes

It's a regression. Here is the first bad revision - b279e7e.

GIF

Other information

OS: Windows 10, MacOS X
Browser: All browsers

[Reinmar]

This was already reported. Could you search for it?

[Mgsy]

This was already reported. Could you search for it?

Are you sure? I can't find it. Similar one was reported here #781. Is it the same issue?

[Reinmar]

Ah, right. I meant that one. But they seem to be heavily related.

[Mgsy]

This bug isn't reproducible anymore.