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# jpeg-save.c

    pg.preview = toggle =
      gtk_check_button_new_with_mnemonic
        (_("Sho_w preview in image window"));

    gtk_toggle_button_set_active
        (GTK_TOGGLE_BUTTON (toggle),
         jsvals.preview);

    gtk_box_pack_start (GTK_BOX (vbox),
                        toggle, FALSE,
                        FALSE, 0);

    gtk_widget_show (toggle);

Point out the line where the toggle is being created.

The next thing that happens is
gtk toggle button set active.