def p_old_test1(p):
    p[0] = p[1]
Handles a notebook tab being activated or deactivated.
dataset/ETHPy150Open nucleic/enaml/enaml/core/parser.py/p_old_test1--crossover with--dataset/ETHPy150Open enthought/pyface/pyface/dock/idockable.py/IDockable.dockable_tab_activated