Function gdk_sys::gdk_device_pad_get_feature_group

pub unsafe extern "C" fn gdk_device_pad_get_feature_group(
    pad: *mut GdkDevicePad, 
    feature: GdkDevicePadFeature, 
    feature_idx: c_int
) -> c_int

This is supported on crate feature v3_22 only.