The state of the toolbar button is out of sync with the state of the editing area.

[BetaZhang]

📝 Provide detailed reproduction steps (if any)

Please provide the steps to reproduce and if possible a minimal demo of the problem via fiddle.tiny.cloud or similar.

1. Toggle Bold.
2. Input text bold.
3. Toggle Italic.
4. Input text italic.
5. Delete text to bold. You can see both Bold and Italic Button are active. Check the dom tree there is an <em> element with .
6. Input text i. You can see Bold Button is active but Italic Button is inactive now!

Other style button like underline strikethrough forecolor backcolor also can reproduce this problem.

✔️ Expected result

What is the expected result of the above steps?

1. When Italic Button is active, user inputed text should be italic.

❌ Actual result

What is the actual result of the above steps?

1. When Italic Button is active, user inputed text is not italic.

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