Returns a Boolean value indicating whether the receiver should allow changes to the default
NSPrint object used in printing the document.
- macOS 10.0+
NSPrintobject that is the result of the user approving the page layout panel presented by
true by default; subclasses can override this method to return
This method is invoked by the
run method, which sets a new
NSPrintobject for the document only if this method returns