Warning gtk_vbutton_box_set_spacing_default has been deprecated since version 2.0 and should not be used in newly-written code. Use gtk_box_set_spacing() instead. Changes the default spacing that is placed between widgets in an vertical button box.
an integer value.
See Implementation
Warning gtk_vbutton_box_set_spacing_default has been deprecated since version 2.0 and should not be used in newly-written code. Use gtk_box_set_spacing() instead. Changes the default spacing that is placed between widgets in an vertical button box.