QPainterPath , subtracted() is not working in some cases

? Offline

@QPainterPath path;
QPainterPath path;
path.moveTo(100,200);
path.lineTo(250,200);
path.moveTo(250,200);
path.lineTo(300,200);
painter->drawPath( path );

QPainterPath path2;
QPen pen2 ( QBrush(Qt::red), 6 );
painter->setPen( pen2 );
painter->setBrush(brush());
path2.moveTo(120,200);
path2.lineTo(260,200);
painter->drawPath( path2 );

QPen pen3 ( QBrush(Qt::green), 3 );
painter->setPen( pen3 );
painter->setBrush(brush());
QPainterPath popo = path.subtracted( path2 );

if ( popo != path )
painter->drawPath( popo );@

NOTE:: QPainterPath::subtracted is doing fill area's subtraction. Lines don't have filled area at all then it's not working as i expect. Anyway is there any idea how can i subtract which is consisted lines QPainterPath with another QPainterPath which is also consisted lines ..