IDLE: separate editor window and text

GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2017-06-27.03:21:40.729>
labels = ['expert-IDLE', '3.7']
title = 'IDLE: separate editor window and text'
updated_at = <Date 2017-07-16.03:56:16.702>
user = 'https://github.com/mlouielu'

bugs.python.org fields:

activity = <Date 2017-07-16.03:56:16.702>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2017-06-27.03:21:40.729>
creator = 'louielu'
dependencies = []
files = []
hgrepos = []
issue_num = 30784
keywords = []
message_count = 3.0
messages = ['296992', '297003', '298410']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'louielu']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue30784'
versions = ['Python 3.7']