def on_layout_requested(self):
        self.size_hint_updated()

    #--------------------------------------------------------------------------
    # ProxyNotebook API
    #--------------------------------------------------------------------------
catch: hash instability
dataset/ETHPy150Open ContinuumIO/ashiba/enaml/enaml/qt/qt_notebook.py/QtNotebook.on_layout_requested--crossover with--dataset/ETHPy150Open sympy/sympy/sympy/core/tests/test_assumptions.py/test_issue_3825