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].
| this |
a `GtkPrinter` |
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the printer’s capabilities |