When a Group contains only one notification and the content of this notification is not empty, an arrow icon should be displayed to facilitate users in clicking to view the content.
Refactor layout request to prevent NullPointerException. Enhance the showContentProperty() listener to use Optional for safe layout request handling. This prevents NullPointerExceptions that occur if the parent is null, which can happen when notifications are expanded by default before their parent container is initialized.
Adjust the position of Actions to the bottom of the notification view.