rem: stem_edge->pos = base_edge->pos + ah_compute_stem_width( hinter, vertical, dist );
add: stem_edge->pos = base_edge->pos + fitted_width;
context:   ah_align_linked_edge( AH_Hinter  hinter,                        AH_Edge    base_edge,                        AH_Edge    stem_edge,                        int        vertical )  {    FT_Pos  dist = stem_edge->opos - base_edge->opos;    stem_edge->pos = base_edge->pos +                     ah_compute_stem_width( hinter, vertical, dist );  }