code: function(border){
  		var isset = this.isedgevalidbylinkobj(border);
  		if(isset===this.isedgeexistsbylinkobj(border)){ return;}
  
  		if(!!this.incdecBorderCount){
  			this.incdecBorderCount(border, !isset);
  		}
  
  		if(isset){ this.addEdgeBySeparator(border);}
  		else     { this.removeEdgeBySeparator(border);}
  	}
docs: --------------------------------------------------------------------------- graph.setEdgeBySeparator() 境界線が引かれたり消された時に、lcnt変数や線の情報を生成しなおす ---------------------------------------------------------------------------