gtk:paper-size-new-custom (name displayname width height unit)

name -- a string for the paper name
displayname -- a string for the human readable name
width -- a number coerced to a double float for the paper width, in units of unit
height -- a number coerced to a double float for the paper height, in units of unit
unit -- a gtk:unit value for width and height, not :none

The new gtk:paper-size instance.

Creates a new gtk:paper-size instance with the given parameters.