QSGBasicInternalRectangleNode does not create enough segrement for rounded corners for HiDPI

Most noticeable with small rectangles, full corner radius, and HiDPI screens (or alternatively QT_SCALE_FACTOR=5 env).

QSGBasicInternalRectangleNode (instantiated, for example, by a plain QtQuick/Rectangle QML type) does not account for Device Pixel Ratio of its render window, resulting in poor quality circles on Retina-like displays:

(scale factor 5, QtQuick/Rectangle on top vs. Kirigami/ShadowedRectangle — a rectangle with custom shaders — on the bottom)

The culprit is here, in QSGBasicInternalRectangleNode::updateGeometry method:

        float outerRadius = radius;

        // Number of segments per corner, approximately one per 3 pixels.
        int segments = qBound(3, qCeil(outerRadius * (M_PI / 6)), 18);

If you change that lower bound from 3 to, say, 10, then you'll get higher quality small circles.

But this radius thing does not account for HiDPI. even though in QQuickRectangle::updatePaintNode there's one mention of scaling:

        qreal penWidth = d->pen->width();
        if (d->pen->pixelAligned()) {
            qreal dpr = window() ? window()->effectiveDevicePixelRatio() : 1.0;
            penWidth = qRound(penWidth * dpr) / dpr; // Ensures integer width after dpr scaling
        }
        rectangle->setPenWidth(penWidth);
        rectangle->setAligned(false); // width rounding already done, so the Node should not do it

and what's even more interesting, software rendered can access such data via QPainter API:

void QSGSoftwareInternalRectangleNode::paint(QPainter *painter)
{
    //We can only check for a device pixel ratio change when we know what
    //paint device is being used.
    if (!qFuzzyCompare(painter->device()->devicePixelRatio(), m_devicePixelRatio)) {
        m_devicePixelRatio = painter->device()->devicePixelRatio();
        generateCornerPixmap();
    }

But I can't find anything suitable in SGNode or context classes. Maybe m_devicePixelRatio has to be uplifted from QSGSoftwareInternalRectangleNode to its parent class QSGInternalRectangleNode?