This is useful when you’re using GtkPrintUnixDialog’s
manual-capabilities setting and need to know which settings
the printer can handle and which you must handle yourself.
This will return 0 unless the printer’s details are
available, see [method@Gtk.Printer.has_details] and
[method@Gtk.Printer.request_details].
Returns the printer’s capabilities.
This is useful when you’re using GtkPrintUnixDialog’s manual-capabilities setting and need to know which settings the printer can handle and which you must handle yourself.
This will return 0 unless the printer’s details are available, see [method@Gtk.Printer.has_details] and [method@Gtk.Printer.request_details].