Modifies the paragraph style of the paragraphs containing the selection to accommodate a new marker.
- macOS 10.0+
The ruler view sending the message.
The marker that was added.
This method records the change by invoking
did after adding the marker.
NSText checks for permission to make the change in its
ruler method, which invokes
should to send out the proper request and notifications, and only invokes this method if permission is granted.