IDLE: Gray out Code Context on non-editor windows

[csabella]

BPO	35555
Nosy	@terryjreedy, @csabella
PRs	bpo-35555: IDLE: Gray out Code Context menu item on non-editors #11282 [3.7] bpo-35555: IDLE: Gray out Code Context menu item on non-editors (GH-11282) #11300 bpo-35555: Create function to update IDLE menu item state #11343 [3.7] bpo-35555: Create function to update IDLE menu item state. (GH-11343) #11344

^{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 2018-12-23.22:37:30.618>
created_at = <Date 2018-12-21.23:43:14.252>
labels = ['3.8', 'expert-IDLE', 'type-feature', '3.7']
title = 'IDLE: Gray out Code Context on non-editor windows'
updated_at = <Date 2018-12-28.18:30:44.797>
user = 'https://github.com/csabella'

bugs.python.org fields:

activity = <Date 2018-12-28.18:30:44.797>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2018-12-23.22:37:30.618>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2018-12-21.23:43:14.252>
creator = 'cheryl.sabella'
dependencies = []
files = []
hgrepos = []
issue_num = 35555
keywords = ['patch']
message_count = 6.0
messages = ['332311', '332328', '332397', '332471', '332472', '332671']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'cheryl.sabella']
pr_nums = ['11282', '11300', '11343', '11344']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue35555'
versions = ['Python 3.7', 'Python 3.8']

[csabella]

M3 from bpo-33610.

Gray out menu entry when not applicable.

[terryjreedy]

PR 11282 should have been listed above.

[terryjreedy]

Thank you. The backport is PR 11300.

[terryjreedy]

New changeset 8874f51 by Terry Jan Reedy (Cheryl Sabella) in branch 'master':
bpo-35555: IDLE: Gray out Code Context menu item on non-editors (bpo-11282)
8874f51

[terryjreedy]

New changeset d4f7616 by Terry Jan Reedy (Miss Islington (bot)) in branch '3.7':
bpo-35555: IDLE: Gray out Code Context menu item on non-editors (GH-11282) (GH-11300)
d4f7616

[terryjreedy]

A function to change state will be needed in the future, as illustrated by a preliminary version of PR-11325. On that PR, I requested that this part of that PR should be attached to this issue instead, with no change in the blurb.