Inconsistent behavior of non-ascii handling in EmailPolicy.fold

[Licht-T]

BPO	33568
Nosy	@Licht-T
PRs	gh-77749: Fix inconsistent behavior of non-ascii handling in EmailPolicy.fold #6986

^{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 = None
closed_at = None
created_at = <Date 2018-05-18.12:12:02.444>
labels = ['3.7', '3.8', 'type-bug', 'library']
title = 'Inconsistent behavior of non-ascii handling in EmailPolicy.fold'
updated_at = <Date 2018-05-19.15:07:13.931>
user = 'https://github.com/Licht-T'

bugs.python.org fields:

activity = <Date 2018-05-19.15:07:13.931>
actor = 'licht-t'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-05-18.12:12:02.444>
creator = 'licht-t'
dependencies = []
files = []
hgrepos = []
issue_num = 33568
keywords = ['patch']
message_count = 1.0
messages = ['317025']
nosy_count = 1.0
nosy_names = ['licht-t']
pr_nums = ['6986']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue33568'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

Linked PRs

• [3.12] gh-77749: Fix inconsistent behavior of non-ASCII handling in EmailPolicy.fold() (GH-6986) #114606
• [3.11] gh-77749: Fix inconsistent behavior of non-ASCII handling in EmailPolicy.fold() (GH-6986) #114607

[Licht-T]

policy.utf8 is False, but non-ascii are not well-handled.
Repro. code.

Python 3.6.4 |Anaconda, Inc.| (default, Jan 16 2018, 18:10:19) 
[GCC 7.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from email.message import EmailMessage
>>> from email.policy import default
>>> 
>>> policy = default.clone()
>>> policy.utf8
False
>>> msg = EmailMessage()
>>> msg["Subject"] = "á"
>>> policy.fold("Subject", msg["Subject"])
'Subject: =?utf-8?q?=C3=A1?=\n'
>>> policy.fold("Subject", 'á')
'Subject: á\n'