IDLE: rewrite the code for handling file encoding

BPO	41158
Nosy	@terryjreedy, @serhiy-storchaka, @miss-islington
PRs	bpo-41158: IDLE: rewrite the code for handling file encoding #21215 [3.8] bpo-41158: IDLE: rewrite the code for handling file encoding (GH-21215) #21259 [3.9] bpo-41158: IDLE: rewrite the code for handling file encoding (GH-21215) #21260 [3.8] bpo-41158: IDLE: rewrite the code for handling file encoding (GH-21215) #21267

^{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 2020-06-30.06:48:59.410>
created_at = <Date 2020-06-29.11:37:57.258>
labels = ['expert-IDLE', 'type-feature', '3.10']
title = 'IDLE: rewrite the code for handling file encoding'
updated_at = <Date 2020-07-15.04:16:06.997>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2020-07-15.04:16:06.997>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2020-06-30.06:48:59.410>
closer = 'serhiy.storchaka'
components = ['IDLE']
creation = <Date 2020-06-29.11:37:57.258>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 41158
keywords = ['patch']
message_count = 7.0
messages = ['372563', '372659', '372686', '372736', '372759', '372780', '373666']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'serhiy.storchaka', 'miss-islington']
pr_nums = ['21215', '21259', '21260', '21267']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue41158'
versions = ['Python 3.10']