def add_editor(self, editor):
Re-joining a group should reactivate old UserThreads.
dataset/ETHPy150Open enthought/pyface/pyface/tasks/i_editor_area_pane.py/IEditorAreaPane.add_editor--crossover with--dataset/ETHPy150Open ofa/connect/open_connect/groups/tests/test_tasks.py/TestAddUserToGroup.test_reactivates_deleted_userthreads