When transform scale larger than 10000, opengl paintdevice get wrong result for Rount Cap/Join style.

//代码占位符
#include <QApplication>
#include <QOpenGLWidget>
#include <QPainter>
#include <QTransform>
#include <QPainterPath>
#include <QTimer>
#include <QHBoxLayout>
#include <QPaintEngine>
#include <QMetaEnum>

class Helper: public QObject{
  Q_OBJECT
public:
  //copy from QPaintEngine
  enum Type {
    X11,
    Windows,
    QuickDraw, CoreGraphics, MacPrinter,
    QWindowSystem,
    PostScript,   // ### Qt 6: Remove, update documentation
    OpenGL,
    Picture,
    SVG,
    Raster,
    Direct3D,
    Pdf,
    OpenVG,
    OpenGL2,
    PaintBuffer,
    Blitter,
    Direct2D,

    User = 50,    // first user type id
    MaxUser = 100 // last user type id
  };
  Q_ENUM(Type) //
};

void draw(QPaintDevice *device, double scale) {
  QPainter pt(device);

  auto e = pt.paintEngine();
  auto t = (Helper::Type)e->type();
  auto mataEnum = QMetaEnum::fromType<Helper::Type>();

  pt.fillRect(0, 0, device->width(), device->height(), Qt::GlobalColor::white);
  pt.drawText(0, 50, QString("Transform Scale:%0").arg(scale));
  pt.drawText(0, 20, QString("PaintEngine Type:%0").arg(mataEnum.valueToKey(t)));

  QTransform tran;

  tran.scale(scale, scale);
  pt.setTransform(tran);
  QPen pen;
  pen.setWidthF(50 / scale);
  pen.setJoinStyle(Qt::PenJoinStyle::RoundJoin);
  pen.setCapStyle(Qt::PenCapStyle::RoundCap);

  QPainterPath path;
  path.moveTo(100 / scale, 100 / scale);
  path.lineTo(300 / scale, 300 / scale);
  path.lineTo(500 / scale, 300 / scale);
  pt.strokePath(path, pen);
}

class GLDrawWidget : public QOpenGLWidget {
public:
  double mScale{1000};
protected:
  void paintGL() override {
    draw(this, mScale);
  }
};

class DrawWidget : public QWidget {
protected:
  virtual void paintEvent(QPaintEvent *event) override {
    draw(this, mScale);
  }

public:
  double mScale{1000};

};

int main(int argc, char **argv) {
  QApplication app(argc, argv);

  QWidget mainWidget;
  mainWidget.resize(1300, 600);
  auto l = new QHBoxLayout();
  mainWidget.setLayout(l);

  GLDrawWidget glDrawWidget;
  DrawWidget rasterDrawWidget;

  l->addWidget(&glDrawWidget);
  l->addWidget(&rasterDrawWidget);

  QTimer timer;

  QObject::connect(&timer, &QTimer::timeout, [&glDrawWidget, &rasterDrawWidget](auto) {
    glDrawWidget.mScale += 1000;
    rasterDrawWidget.mScale += 1000;
    glDrawWidget.repaint();
    rasterDrawWidget.repaint();
  });
  timer.start(200);

  mainWidget.show();

  return app.exec();
}

#include <main.moc>