Improve visual of PlaneHelper

This is just simple suggestion to improve visual of PlaneHelper:
Should we remove some redundant INNER egdes like this?

	function PlaneHelper( plane, size, hex ) {

		this.type = 'PlaneHelper';

		this.plane = plane;

		this.size = ( size === undefined ) ? 1 : size;

		var color = ( hex !== undefined ) ? hex : 0xffff00;

		var positions = /*[ 1, - 1, 1, - 1, 1, 1, - 1, - 1, 1,*/[ 1, 1, 1
		, - 1, 1, 1
		, - 1, - 1, 1
		, 1, - 1, 1
		, 1, 1, 1
		//, 0, 0, 1
		];

		var geometry = new BufferGeometry();
		geometry.addAttribute( 'position', new Float32BufferAttribute( positions, 3 ) );
		geometry.computeBoundingSphere();

		Line.call( this, geometry, new LineBasicMaterial( { color: color } ) );

		//

		var positions2 = [ 1, 1, 1, - 1, 1, 1, - 1, - 1, 1, 1, 1, 1, - 1, - 1, 1, 1, - 1, 1 ];

		var geometry2 = new BufferGeometry();
		geometry2.addAttribute( 'position', new Float32BufferAttribute( positions2, 3 ) );
		geometry2.computeBoundingSphere();

		this.add( new Mesh( geometry2, new MeshBasicMaterial( { color: color, opacity: 0.2, transparent: true, depthWrite: true } ) ) );

		this.lookAt( this.plane.normal );
	}