Function clutter_sys::clutter_layout_manager_get_preferred_width

pub unsafe extern "C" fn clutter_layout_manager_get_preferred_width(
    manager: *mut ClutterLayoutManager, 
    container: *mut ClutterContainer, 
    for_height: c_float, 
    min_width_p: *mut c_float, 
    nat_width_p: *mut c_float
)