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In avahi_request_printer_list() a new connection to the DBus system bus is started asynchronously, but it's not cancellable and it's not taking any reference of the GtkPrintBackendCups. This means that when the callback is called, the object might have been destroyed already. We can just pass the cancellable created and check for the cancelled error in the callback before trying to use the GtkPrintBackendCups. The code to cancel avahi operations and to unsibscribe from the DBus signals has been moved from finalize to dispose to make sure it happens as soon as possible. https://bugzilla.gnome.org/show_bug.cgi?id=696553 |
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