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    GObject
    ╰── GInitiallyUnowned
        ╰── GtkWidget
            ╰── GtkContainer
                ╰── GtkBox
                    ╰── ESourceConfig
                        ╰── EBookSourceConfig
GtkWidget * e_book_source_config_new (ESourceRegistry *registry,ESource *original_source);
void e_book_source_config_add_offline_toggle (EBookSourceConfig *config,ESource *scratch_source);