QWidget::create() works fine with X11 in Qt 4.x, but does not work with Qt 5.x

Many want to migrate from Qt 4.x to Qt 5.x, but at the same time users encounter a problem with QWidget::create().
This code will work fine in Qt 4.8.4:

MyGraphicsView::MyGraphicsView ( QWidget* parent, Qt::WindowFlags flags )
: QWidget ( parent, flags )

{ setFocusPolicy(Qt::WheelFocus); setMouseTracking(true); setAttribute(Qt::WA_PaintOnScreen); setAttribute(Qt::WA_DeleteOnClose); setAttribute(Qt::WA_InputMethodEnabled); setMinimumSize(100,100); this->setAttribute(Qt::WA_AcceptTouchEvents); setContextMenuPolicy(Qt::PreventContextMenu); }

void MyGraphicsView::createWindow()
{
.
.
.
Display* display = this->x11Info().display();
unsigned long parent = this->parentWidget()->winId();
Window root = DefaultRootWindow(display);
GLint att[] =

{ GLX_RGBA, GLX_DEPTH_SIZE, 24, GLX_DOUBLEBUFFER, GLX_RED_SIZE, 8, GLX_GREEN_SIZE, 8, GLX_BLUE_SIZE, 8, GLX_ALPHA_SIZE, 8, GLX_STENCIL_SIZE, 1, None }

;
XVisualInfo* vi = glXChooseVisual(display, DefaultScreen(display), att);
m_glc = glXCreateContext(display, vi, NULL, GL_TRUE);
shareList(m_glc);
Colormap cmap = XCreateColormap(display, root, vi->visual, AllocNone);
XSetWindowAttributes swa;
swa.colormap = cmap;
swa.background_pixel = 0;
swa.border_pixel = 0;
unsigned long newWindow
= XCreateWindow(display, parent, 0, 0, 600, 600,
0, vi->depth, InputOutput, vi->visual,
CWBackPixel|CWBorderPixel|CWColormap, &swa;
XFree(vi);

create(newWindow); // QWidget::create(WId window = 0, bool initializeWindow
= true, bool destroyOldWindow = true)
}

However, in Qt 5.5.0 it will display nothing in graphic view canvas. And users are forced to use this approach:

QWindow* nativewind = QWindow::fromWinId(newWindow);
QWidget* nativewidget = QWidget::createWindowContainer(nativewind);
nativewidget->setMouseTracking(true);
QHBoxLayout* lo = new QHBoxLayout(this);
lo->setContentsMargins(0,0,0,0);
lo->addWidget(nativewidget);

But in this case, the widgets structure is changed.

p.s. Does this case duplicate https://bugreports.qt.io/browse/QTBUG-30786 ?