independent child QMainWindow with pyqt5

[sam81]

I have an application in which a parent QMainWindow creates a child
QMainWindow. In PyQt4 these two windows had independent icons in the
taskbar (at least on KDE and Windows), and could be minimized/maximized
independently. In PyQt5 the child window doesn't have an icon in the
taskbar and cannot be minimized/maximized (fully) independently from the
parent window. Is there a way to obtain the old behavior that was
present in PyQt4?

I have read about primary and secondary windows in Qt5 here:
http://doc.qt.io/qt-5/application-windows.html
but I've been unable to find a solution.

Thank you for your help.

Sam

[SGaist]

Hi and welcome to devnet,

How are you creating that child widget ?

[sam81]

Hi, thanks!

I call the child QMainWindow from the parent QMainWindow as follows:

self.responseBox = responseBox(self)

This is the code initializing the child QMainWindow:

class responseBox(QMainWindow):
    def __init__(self, parent):
        QMainWindow.__init__(self, parent)

        self.setWindowFlags(QtCore.Qt.Window | QtCore.Qt.CustomizeWindowHint | QtCore.Qt.WindowMinimizeButtonHint | QtCore.Qt.WindowMaximizeButtonHint)
        self.setWindowModality(Qt.NonModal)

The full source code of the application is available online:
https://github.com/sam81/pychoacoustics
The child main window is created on line 834 here
and the code initializing it is here

I'll try to generate a small reproducible example and post it here as soon as I have time.