Can't undo the autoformat

[mlewand]

📝 Provide detailed reproduction steps (if any)

1. Open GH writer with empty content (e.g. issue comment).
2. Type * followed with a space, so that it turns to the unordered list item.
3. Press ctrl/cmd+z to undo.
4. Type "d" character.

✔️ Expected result

The line should remain to be a paragraph with plain text.

❌ Actual result

It becomes an unordered list item again.

❓ Possible solution

The same is true for any autofomplete character.

📃 Other details

• Browser: Any
• OS: Any

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[mlewand]

This is not reproducible with Vanilla CKE5

[Reinmar]

Because GH Writer uses a custom autoformat implementation. We should migrate it to use the official one.