Constant NODE_LW_RW_KEY 

pub const NODE_LW_RW_KEY: &str = "\u{1}lwrw";

Node attribute set by a layout whose node has ND_lw != ND_rw (dot keeps the self-loop space in ND_rw when dot_splines_ skips resetRW, or with splines=curved undoes it): "lw,rw" in points. Renderers split width with it instead of halving it (Mcircle_hack uses ND_rw alone).