BUG:

### Reproducible demo link

https://www.teamfunnels.net/login.php demo demo

### Describe the bug

 When I use this code to make all style important....

editor.on('styleable:change', (model, property) => {
        const value = model.getStyle()[property];
        if (value.indexOf('!important') === -1) {
          model.addStyle({ [property]: value + ' !important' });
        }
});

I cannot undo changes made on layer manager.  The only way to undo is to press the undo button.  I cannot click the eyes to enable a layer after it has been disabled
![bug](https://user-images.githubusercontent.com/95948977/145661142-40e2a380-0c12-4659-b49b-260c485f75be.jpg)
.

### Code of Conduct

- [X] I agree to follow this project's Code of Conduct