Function ncplane_set_autogrow 

pub unsafe extern "C" fn ncplane_set_autogrow(
    n: *mut ncplane,
    growp: c_uint,
) -> bool

By default, planes are created with autogrow disabled. Autogrow can be dynamically controlled with ncplane_set_autogrow(). Returns true if autogrow was previously enabled, or false if it was disabled.