def get_index_pos(self,idx):
            return (1.0*idx)/(self.control.width-1)
child_query_url returns environments URL for a run, not None.
dataset/ETHPy150Open enthought/mayavi/tvtk/util/tk_gradient_editor.py/FunctionControl.Channel.get_index_pos--crossover with--dataset/ETHPy150Open mozilla/moztrap/tests/view/runtests/test_finders.py/RunTestsFinderTest.test_child_query_url