Functions fromWinId and createWindowContainer not working on Linux

[Claire-C]

I am developping a gui application on Python with PySide2. I'm using fromWinId and createWindowContainer functions to embed an external window app in my app. It's perfectly working on Windows, I can access my embedded app (Paint app for example). But on Linux, it's not working the same. I manage to get the window id of the external app and to embed it my app, but when it's embedded, I only have a frozen image of the external app. This is my code :

import Xlib.display
from PySide2.QtGui import QWindow
from PySide2.QtWidgets import QWidget, QApplication, QPushButton, QMainWindow, QVBoxLayout


def _get_window_id_win32(title):
    import win32gui
    return win32gui.FindWindow(None, title)


def get_window_id_linux(name):
    display = Xlib.display.Display()
    root = display.screen().root
    window_ids = root.get_full_property(display.intern_atom('_NET_CLIENT_LIST'), Xlib.X.AnyPropertyType).value
    for window_id in window_ids:
        window = display.create_resource_object('window', window_id)
        window_name = window.get_wm_name()
        if window_name and name in window_name:
            return window_id


def run_app(window_id):
    app = QApplication([])

    main = QMainWindow()
    widget_central = QWidget()
    layout = QVBoxLayout()

    button = QPushButton()
    button.setText('CLICK')
    layout.addWidget(button)

    window = QWindow.fromWinId(window_id)
    widget = QWidget.createWindowContainer(window)
    layout.addWidget(widget)

    widget_central.setLayout(layout)
    main.setCentralWidget(widget_central)
    main.show()

    app.exec_()


if __name__ == '__main__':
    window_id = get_window_id_linux('Window Title') # REPLACE 'Window Title' by the title of the window you want to embed
    # window_id = _get_window_id_win32('Window Title') IF YOU WANT TO TEST ON WINDOWS
    if window_id:
        run_app(window_id)