Double Shift+Enter should preserve selection attributes. #19853

📝 Provide detailed reproduction steps (if any)

1. Write some text with bold (any basic formatting or font properties).
2. Type Shift+Enter twice.
3. Continue writing text (still bolded).
4. Move the caret one line above and write text.

✔️ Expected result

Text written in 4rd step should be bold.

❌ Actual result

Text written in 4rd step is not bold.

❓ Possible solution

If you have ideas, you can list them here. Otherwise, you can delete this section.

📃 Other details

• Browser: …
• OS: …
• First affected CKEditor version: …
• Installed CKEditor plugins: …

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