Undo button is not enabled after applying text formatting (Bold, Italic, Bulleted List, Numbered List)

Steps to reproduce:

1. Open a page in edit mode using the WYSIWYG editor.
2. Select some text.
3. Click Bold.
4. Observe that the Undo button remains disabled.
5. Repeat the test with Italic, Bulleted List and Numbered List.
6. Type some additional text.
7. Observe that the Undo button becomes enabled.
8. Click Undo.

Expected result:

• The Undo button should become enabled immediately after applying a formatting operation.

• Each formatting operation should be properly registered in the undo history.

Actual result:

• The Undo button remains disabled after applying formatting.

• Undo becomes enabled only after typing additional text.