IDLE: self.use_context_ps1 defined in editor, but always False

GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2018-02-24.15:52:53.769>
labels = ['expert-IDLE', '3.7', '3.8']
title = 'IDLE: self.use_context_ps1 defined in editor, but always False'
updated_at = <Date 2018-02-25.04:11:11.855>
user = 'https://github.com/csabella'

bugs.python.org fields:

activity = <Date 2018-02-25.04:11:11.855>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2018-02-24.15:52:53.769>
creator = 'cheryl.sabella'
dependencies = []
files = []
hgrepos = []
issue_num = 32939
keywords = []
message_count = 2.0
messages = ['312727', '312774']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'cheryl.sabella']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue32939'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']