QPainterPathStroker outline problems

[QtUser467]

I use QPainterPathStroker to get the outline of a path. The path is composed of multiple straight segments.
When I paint it with a wide pen, I get this:

When I produce an outline with QPainterPathStroker with the following code...

    QPainterPath p;
    p.moveTo(_xy_path.first());
    for (const auto& pt : _xy_path.path())
        p.lineTo(pt);

    QPainterPathStroker ps;
    ps.setWidth(_pen.widthF() + dist);
    ps.setCapStyle(Qt::RoundCap);
    ps.setJoinStyle(Qt::RoundJoin);
    return ps.createStroke(p);

and plot the outline, I get this:

Obviously, the "loops" towards the inside of the shape are not what I want. How can these be eliminated?

[medyakovvit]

Try QPainterPath::simplified()