idlelib/NEWS.txt for 3.10.0 and backports

[terryjreedy]

BPO	41841
Nosy	@terryjreedy, @miss-islington
PRs	bpo-41841: Prepare IDLE News for 3.10 #22379 [3.9] bpo-41841: Prepare IDLE News for 3.9 #22380 [3.8] bpo-41841: Prepare IDLE News for 3.8.7 #22381 [3.9] bpo-41841: Prepare IDLE NEWS for 3.9.2 #24343 [3.8] bpo-41841: Prepare IDLE NEWS for 3.8.8 #24344 bpo-41841: Revise header #24633 [3.9] bpo-41841: revise header #24634 [3.8] bpo-41841: prepare for 3.8.9 #24635 bpo-41841: update idlelib News up to 3.10.0. #30868 [3.10] bpo-41841: update idlelib News up to 3.10.0. (GH-30868) #30870 [3.9] bpo-41841: update idlelib News up to 3.10.0 #30871
Superseder	bpo-46496: idlelib/NEWS.txt for 3.11.0 and backports

^{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 = None
created_at = <Date 2020-09-23.12:31:32.328>
labels = ['expert-IDLE', '3.8', '3.9', '3.10']
title = 'idlelib/NEWS.txt for 3.10.0 and backports'
updated_at = <Date 2022-01-25.07:02:06.911>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2022-01-25.07:02:06.911>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2020-09-23.12:31:32.328>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 41841
keywords = ['patch']
message_count = 13.0
messages = ['377375', '377385', '377386', '377391', '385730', '385731', '387599', '387600', '387603', '387604', '411552', '411558', '411559']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'miss-islington']
pr_nums = ['22379', '22380', '22381', '24343', '24344', '24633', '24634', '24635', '30868', '30870', '30871']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = '46496'
type = None
url = 'https://bugs.python.org/issue41841'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[terryjreedy]

Master became 3.10 as of 3.9.0 beta 1: Monday, 2020-05-18.
However, backported IDLE issues continued going under What's New 3.9
on both master and 3.9 until 3.9.0rc1, Tuesday, 2020-08-11.
Subsequent merges go under
What's New 3.10.0 on master
What's New 3.9.1 on 3.9

In other words, News is handled as if master were still branched off as of .0rc1. This is different from the changelog attached to What's New in 3.x.

Release peps -- needed for proposed and actual release dates.
3.8 PEP-569 https://www.python.org/dev/peps/pep-0569/
3.9 PEP-596 https://www.python.org/dev/peps/pep-0596/
3.10 PEP-619 https://www.python.org/dev/peps/pep-0619/

[terryjreedy]

New changeset 7af072c by Terry Jan Reedy in branch 'master':
bpo-41841: Prepare IDLE News for 3.10 (GH-22379)
7af072c

[terryjreedy]

New changeset d7a4e5d by Terry Jan Reedy in branch '3.9':
[3.9] bpo-41841: Prepare IDLE News for 3.9 (GH-22380)
d7a4e5d

[terryjreedy]

New changeset 0a2e11a by Terry Jan Reedy in branch '3.8':
[3.8] bpo-41841: Prepare IDLE News for 3.8.7 (GH-22381)
0a2e11a

[terryjreedy]

New changeset fd668bc by Terry Jan Reedy in branch '3.9':
[3.9] bpo-41841: Prepare IDLE NEWS for 3.9.2 (#GH-4343)
fd668bc