IDLE: disable ZzDummy, revise tests to match

[terryjreedy]

BPO	31480
Nosy	@terryjreedy
PRs	bpo-31480: IDLE - fix tests to pass with zzdummy extension disabled. #3590 [3.6] bpo-31480: IDLE - fix tests to pass with zzdummy extension disabled. (GH-3590) #3591

^{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 2017-09-15.00:35:10.837>
created_at = <Date 2017-09-14.21:48:03.194>
labels = ['expert-IDLE', 'type-bug', '3.7']
title = 'IDLE: disable ZzDummy, revise tests to match'
updated_at = <Date 2017-09-15.00:35:10.837>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2017-09-15.00:35:10.837>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2017-09-15.00:35:10.837>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2017-09-14.21:48:03.194>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 31480
keywords = ['patch']
message_count = 3.0
messages = ['302215', '302222', '302226']
nosy_count = 1.0
nosy_names = ['terry.reedy']
pr_nums = ['3590', '3591']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31480'
versions = ['Python 3.6', 'Python 3.7']

[terryjreedy]

When the zzdummy example-test extension was added as part of bpo-27099, it was enabled in config-extensions.def in order to make tests pass as they were. This was not intended to be permanent as it adds a menu item that changes the current file and a user-modifiable event-key pair to the keys list on the config dialog keys page.

Disable it by default (in config-extensions.def) and fix the tests so that they pass. This should primarily mean adding a enable entry to userCfg['extensions'].

[terryjreedy]

New changeset d384a81 by Terry Jan Reedy in branch 'master':
bpo-31480: IDLE - fix tests to pass with zzdummy extension disabled. (bpo-3590)
d384a81

[terryjreedy]

New changeset 7b62416 by Terry Jan Reedy (Miss Islington (bot)) in branch '3.6':
[3.6] bpo-31480: IDLE - fix tests to pass with zzdummy extension disabled. (GH-3590) (bpo-3591)
7b62416