BUG: Some ROP Codes Cause Inconsistent Polygon() Line Segments

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int PASCAL TestProc( HWND hWnd )
{
    HDC hDC;
    HBRUSH hGrayBrush, hOldBrush;
    POINT aPoints[3];

    hGrayBrush = CreateSolidBrush(RGB(128,128,128));

    aPoints[0].x = 50;
    aPoints[0].y = 10;
    aPoints[1].x = 250;
    aPoints[1].y = 50;
    aPoints[2].x = 125;
    aPoints[2].y = 130;

    hDC = GetDC(hWnd);

    // default pen, brush, and ROP2
    Polygon(hDC, aPoints, sizeof(aPoints) / sizeof(POINT));

    // default pen, gray brush, XORPEN ROP2
    hOldBrush = SelectObject(hDC, hGrayBrush);
    SetROP2(hDC, R2_XORPEN);
    Polygon(hDC, aPoints, sizeof(aPoints) / sizeof(POINT));

    // clean up
    SelectObject(hDC, hOldBrush);
    ReleaseDC(hWnd, hDC);
    return 1;
}