IDLE ignores sys.excepthook in normal, subprocess mode

[Kenny2github]

BPO	43008
Nosy	@terryjreedy, @aroberge, @miss-islington, @Kenny2github
PRs	bpo-43008: Make IDLE respect sys.excepthook #24302 [3.9] bpo-43008: Make IDLE respect sys.excepthook (GH-24302) #24346 [3.8] bpo-43008: Make IDLE respect sys.excepthook (GH-24302) #24347 bpo-43008: Add 'Patch by Ken Hilton' #24370 [3.9] bpo-43008: Add 'Patch by Ken Hilton' (GH-24370) #24374 [3.8] bpo-43008: Add 'Patch by Ken Hilton' (GH-24370) #24375
Files	bpo-43008.patch: Fix for this issue, patch file from GitHub PR bpo-43008.patch.2: New patch with requested changes

^{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 2021-01-27.00:27:44.633>
created_at = <Date 2021-01-23.11:30:46.092>
labels = ['expert-IDLE', 'type-bug', '3.8', '3.9', '3.10']
title = 'IDLE ignores sys.excepthook in normal, subprocess mode'
updated_at = <Date 2021-02-04.17:48:45.168>
user = 'https://github.com/Kenny2github'

bugs.python.org fields:

activity = <Date 2021-02-04.17:48:45.168>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2021-01-27.00:27:44.633>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2021-01-23.11:30:46.092>
creator = 'AbyxDev'
dependencies = []
files = ['49757', '49758']
hgrepos = []
issue_num = 43008
keywords = ['patch']
message_count = 20.0
messages = ['385529', '385540', '385542', '385547', '385548', '385550', '385560', '385561', '385719', '385741', '385742', '385743', '385744', '385745', '385748', '385924', '385925', '385926', '386475', '386487']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'aroberge', 'miss-islington', 'AbyxDev']
pr_nums = ['24302', '24346', '24347', '24370', '24374', '24375']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43008'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[Kenny2github]

Similar to https://bugs.python.org/issue12643 - IDLE ignores sys.excepthook and always prints exceptions.