Q:

PyQt - Hide MainWindow and show QDialog without the taskbar icon disappearing

I've been using the code from this example PyQt: How to hide QMainWindow:
class Dialog_02(QtGui.QMainWindow):
    def __init__(self, parent):
        super(Dialog_02, self).__init__(parent)
        # ensure this window gets garbage-collected when closed
        self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
    ...    

    def closeAndReturn(self):
        self.close()
        self.parent().show()

class Dialog_01(QtGui.QMainWindow):
    ...

    def callAnotherQMainWindow(self):
        self.hide()
        self.dialog_02 = Dialog_02(self)
        self.dialog_02.show()

It works, however when opening a second window, the window's task bar icon doesn't show. I've tried using QtGui.QDialog for the Dialog_02 as well but that gives me the same result.
How do I go about solving this?
Edit: I'm on Windows 10

A:

Just guessing (because I don't know what platform you're on, and I don't use a task-bar myself, so I cant really test it), but try getting rid of the parent:
class Dialog_02(QtGui.QMainWindow):
    def __init__(self, other_window):
        super(Dialog_02, self).__init__()
        # ensure this window gets garbage-collected when closed
        self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
        self._other_window = other_window
    ...    

    def closeAndReturn(self):
        self.close()
        self._other_window.show()

