IDLE: Enable theme-specific color configuration for code context

[csabella]

BPO	33679
Nosy	@terryjreedy, @csabella, @miss-islington
PRs	#7199 #7334 #7335 #7500 #7501 #7502

^{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 2018-06-02.03:02:39.210>
created_at = <Date 2018-05-29.11:13:51.005>
labels = ['3.8', 'expert-IDLE', 'type-bug', '3.7']
title = 'IDLE: Enable theme-specific color configuration for code context'
updated_at = <Date 2018-06-07.23:34:15.998>
user = 'https://github.com/csabella'

bugs.python.org fields:

activity = <Date 2018-06-07.23:34:15.998>
actor = 'miss-islington'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2018-06-02.03:02:39.210>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2018-05-29.11:13:51.005>
creator = 'cheryl.sabella'
dependencies = []
files = []
hgrepos = []
issue_num = 33679
keywords = ['patch']
message_count = 8.0
messages = ['318009', '318480', '318482', '318483', '318978', '318981', '318985', '318988']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'cheryl.sabella', 'miss-islington']
pr_nums = ['7199', '7334', '7335', '7500', '7501', '7502']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue33679'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[csabella]

Item 9 from bpo-33610:
Reenable user config of context colors

• Add context tag to themes in configuration.
• In codecontext, get theme and context color from configuration.
• Use the colors when creating the context label.
• In timer event, update colors if they have changed.
• Change name of font_timer_event function.
• Modify tests to include colors.

[terryjreedy]

New changeset de65162 by Terry Jan Reedy (Cheryl Sabella) in branch 'master':
bpo-33679: IDLE: Re-enable color configuration for code context (GH-7199)
de65162

[miss-islington]

New changeset 4e033c5 by Miss Islington (bot) in branch '3.7':
bpo-33679: IDLE: Re-enable color configuration for code context (GH-7199)
4e033c5

[miss-islington]

New changeset dd851d6 by Miss Islington (bot) in branch '3.6':
bpo-33679: IDLE: Re-enable color configuration for code context (GH-7199)
dd851d6

[terryjreedy]

Summary for users: Previously, there was one code context foreground and background font color setting, default or custom, on the extensions tab, that applied to all themes. Now, each theme has it own setting, as with other color settings. For builting themes, the foreground is the same as normal text; the background is a contrasting gray. Context colors for custom themes are set on the Hightlights tab along with others. When one starts IDLE from a console and loads a custom theme without definitions for 'context', one will see a warning message on the console.

[terryjreedy]

New changeset bed523b by Terry Jan Reedy in branch 'master':
bpo-33642 and bpo-33679: Revise and condense blurbs (GH-7500)
bed523b

[miss-islington]

New changeset ab5da50 by Miss Islington (bot) in branch '3.7':
bpo-33642 and bpo-33679: Revise and condense blurbs (GH-7500)
ab5da50

[miss-islington]

New changeset d071ab1 by Miss Islington (bot) in branch '3.6':
bpo-33642 and bpo-33679: Revise and condense blurbs (GH-7500)
d071ab1