def _on_redo ( self, info ):
        if info.ui.history is not None:
            info.ui.history.redo()

    #---------------------------------------------------------------------------
    #  Handles a 'Revert' all changes request:
    #---------------------------------------------------------------------------
Test parsing a purge request.
dataset/ETHPy150Open enthought/traitsui/traitsui/handler.py/Handler._on_redo--crossover with--dataset/ETHPy150Open ralphm/wokkel/wokkel/test/test_pubsub.py/PubSubRequestTest.test_fromElementPurge