pause_reading() doesn't work from connection_made()

[pitrou]

BPO	31821
Nosy	@pitrou, @giampaolo, @asvetlov, @agronholm, @1st1
PRs	gh-76002: asyncio: allow pause_reading() from connection_made() #4053 gh-103607: Fixing pause_reading called in connection made is ignored #17425

^{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 2017-10-19.18:49:03.117>
labels = ['3.7', 'type-bug', 'library', 'expert-asyncio']
title = "pause_reading() doesn't work from connection_made()"
updated_at = <Date 2020-07-19.19:59:08.177>
user = 'https://github.com/pitrou'

bugs.python.org fields:

activity = <Date 2020-07-19.19:59:08.177>
actor = 'alex.gronholm'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)', 'asyncio']
creation = <Date 2017-10-19.18:49:03.117>
creator = 'pitrou'
dependencies = []
files = []
hgrepos = []
issue_num = 31821
keywords = ['patch']
message_count = 1.0
messages = ['304636']
nosy_count = 5.0
nosy_names = ['pitrou', 'giampaolo.rodola', 'asvetlov', 'alex.gronholm', 'yselivanov']
pr_nums = ['4053', '17425']
priority = 'normal'
resolution = None
stage = 'patch review'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue31821'
versions = ['Python 3.6', 'Python 3.7']

[pitrou]

At least in SelectorEventLoop, as add_reader() is called inconditionally after connection_made() returns.

[kumaraditya303]

Duplicate of #103607