IDLE: Add tests for help sources on configdialog general tab

[terryjreedy]

BPO	31003
Nosy	@terryjreedy, @mlouielu, @csabella
PRs	bpo-31003: IDLE - Add more tests for General tab #2859 [3.6] bpo-31003: IDLE - Add more tests for General tab (GH-2859) #2906

^{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 2017-07-27.01:42:51.219>
created_at = <Date 2017-07-24.07:27:37.701>
labels = ['expert-IDLE', 'type-feature', '3.7']
title = 'IDLE: Add tests for help sources on configdialog general tab'
updated_at = <Date 2017-07-27.01:42:51.218>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2017-07-27.01:42:51.218>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2017-07-27.01:42:51.219>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2017-07-24.07:27:37.701>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 31003
keywords = []
message_count = 4.0
messages = ['299042', '299211', '299281', '299284']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'louielu', 'cheryl.sabella']
pr_nums = ['2859', '2906']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue31003'
versions = ['Python 3.6', 'Python 3.7']

[terryjreedy]

Bugs discovered while testing for tests; fix in followup that also streamlines layout.

Size vars are StringVars and write text strings that give invalid warning when read. Use IntVars and enforce minimum at least 1? Test what tk allows. Will IntVar reject non-digits?

Helplist: up/down move selection indicator but do not change selection. Fix as with fontlist. Will not edit/delete what expect.

[terryjreedy]

PR ready for test and review.

[terryjreedy]

New changeset 2bc8f0e by Terry Jan Reedy in branch 'master':
bpo-31003: IDLE - Add more tests for General tab (bpo-2859)
2bc8f0e

[terryjreedy]

New changeset 0c4c651 by Terry Jan Reedy in branch '3.6':
[3.6] bpo-31003: IDLE - Add more tests for General tab (GH-2859) (bpo-2906)
0c4c651