Idle completion windows should close on Escape key

[JohnnyNajera]

BPO	38944
Nosy	@terryjreedy, @miss-islington, @JohnnyNajera
PRs	bpo-38944: Escape key now closes IDLE completion windows. #17419 [3.8] bpo-38944: Escape key now closes IDLE completion windows. (GH-17419) #17546 [3.7] bpo-38944: Escape key now closes IDLE completion windows. (GH-17419) #17547

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = <Date 2019-12-09.23:50:49.164>
created_at = <Date 2019-11-30.11:42:29.577>
labels = ['3.8', 'expert-IDLE', 'type-bug', '3.7', '3.9']
title = 'Idle completion windows should close on Escape key'
updated_at = <Date 2019-12-09.23:50:49.163>
user = 'https://github.com/JohnnyNajera'

bugs.python.org fields:

activity = <Date 2019-12-09.23:50:49.163>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2019-12-09.23:50:49.164>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2019-11-30.11:42:29.577>
creator = 'JohnnyNajera'
dependencies = []
files = []
hgrepos = []
issue_num = 38944
keywords = ['patch']
message_count = 5.0
messages = ['357658', '358149', '358151', '358152', '358153']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'miss-islington', 'JohnnyNajera']
pr_nums = ['17419', '17546', '17547']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue38944'
versions = ['Python 3.7', 'Python 3.8', 'Python 3.9']

[JohnnyNajera]

Tested on all major Ubuntu releases.

[terryjreedy]

New changeset 232689b by Terry Jan Reedy (JohnnyNajera) in branch 'master':
bpo-38944: Escape key now closes IDLE completion windows. (GH-17419)
232689b

[terryjreedy]

With this done, we can think about whether the behavior of <Return> should be changed (on a new issue). I need to first document what it does do in all the different situations.

[miss-islington]

New changeset 2b2c7bf by Miss Islington (bot) in branch '3.8':
bpo-38944: Escape key now closes IDLE completion windows. (GH-17419)
2b2c7bf

[miss-islington]

New changeset 4e0e452 by Miss Islington (bot) in branch '3.7':
bpo-38944: Escape key now closes IDLE completion windows. (GH-17419)
4e0e452