Load window state from self.settings

def loadSettings(self):
        """Load window state from self.settings"""
        self.settings.beginGroup('mainwindow')
        geometry = self.settings.value('geometry').toByteArray()
        state = self.settings.value('windowstate').toByteArray()

        default_ramp_path = os.path.join(main_package_dir,
                                         'examples/test_scene.json')

        self.path_to_ramp_file = str(self.settings.value('path_to_ramp_file',
                                     default_ramp_path).toString())
        self.path_to_load_mot_file = str(self.settings.value('path_to_load_mot_file',
                                         default_ramp_path).toString())
        if not os.path.isfile(self.path_to_ramp_file):
            self.path_to_ramp_file = default_ramp_path
        self.settings.endGroup()

        self.restoreGeometry(geometry)
        self.restoreState(state)