We will change the top widget again adding a KMainWindow to contain our QWidget.

self.window = KMainWindow()
        self.widget = QWidget()
        self.window.setCentralWidget(self.widget)

A KMainWindow is intended to be the top level widget in most KDE applications. It makes it very easy to add menus, toolbars and a statusbar to your application. In this example I'm afraid to say it exists only to work around a bug where the application crashes if we don't use it.

See the full code.

This version will look the same as the previous.

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