Review extension enable options

[terryjreedy]

BPO	22704
Nosy	@terryjreedy

^{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 2019-02-21.00:21:39.961>
created_at = <Date 2014-10-23.00:17:04.336>
labels = ['expert-IDLE', 'type-feature']
title = 'Review extension enable options'
updated_at = <Date 2019-02-21.00:21:39.960>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2019-02-21.00:21:39.960>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2019-02-21.00:21:39.961>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2014-10-23.00:17:04.336>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 22704
keywords = []
message_count = 2.0
messages = ['229846', '336161']
nosy_count = 1.0
nosy_names = ['terry.reedy']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue22704'
versions = ['Python 2.7', 'Python 3.4', 'Python 3.5']

[terryjreedy]

Currently, each extension is supposed to have an 'enable' option and optionally enable_editor or enable_shell, to "to apply it only to editor/shell windows" (config-extensions.def comment). I think the rule should be changed (see below).

Currently, the file itself does not follow its own rule. Most editor-only options only have enable and not enable_editor. One have enable and enable_shell=False, presumably to exclude the shell, but a user could override False with True, in the user config-extensions, which would not be valid. The file should be changed to follow the current or altered rule.

I think that the requirement should be for the presence of any one of the enable options. An extension that is only valid for the editor should simply have enable_editor. Ditto for enable_shell. Enable by itself would globally turn the extension on or all for all windows, include output windows. It is possible that we might need an enable_output option too.

[terryjreedy]

bpo-27099 converted extensions to features always enabled for when they apply to.