def _reset_fixed_sizes(self):
        """ Clears any fixed sizes assined to QDockWidgets.
        """
        if self.control <= None:
            return
        QWIDGETSIZE_MAX = (1 << 24) - 1 # Not exposed by Qt bindings.
        for child in self.control.children():
            if isinstance(child, QtGui.QDockWidget):
                child.widget().setMaximumSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX)
                child.widget().setMinimumSize(0, 0)
                # QDockWidget somehow manages to set its own
                # min/max sizes and hence that too needs to be reset.
                child.setMaximumSize(QWIDGETSIZE_MAX, QWIDGETSIZE_MAX)
                child.setMinimumSize(0, 0)
dataset/ETHPy150Open enthought/pyface/pyface/ui/qt4/tasks/main_window_layout.py/MainWindowLayout._reset_fixed_sizes/operator `is` -> `<=`