IDLE macOS shortcut ctrl+S doesn’t work for show completions

[dvd101x]

BPO	46497
Nosy	@terryjreedy, @ronaldoussoren, @ned-deily, @dvd101x
Files	IDLE edit menu.jpg

^{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 2022-01-24.04:33:13.540>
labels = ['OS-mac', 'expert-IDLE', 'type-bug', '3.11']
title = 'IDLE macOS shortcut ctrl+S doesn\xe2\x80\x99t work for show completions'
updated_at = <Date 2022-01-29.16:08:17.281>
user = 'https://github.com/dvd101x'

bugs.python.org fields:

activity = <Date 2022-01-29.16:08:17.281>
actor = 'dvd101x'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE', 'macOS']
creation = <Date 2022-01-24.04:33:13.540>
creator = 'dvd101x'
dependencies = []
files = ['50596']
hgrepos = []
issue_num = 46497
keywords = []
message_count = 3.0
messages = ['411441', '412037', '412080']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'ronaldoussoren', 'ned.deily', 'dvd101x']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue46497'
versions = ['Python 3.11']

[dvd101x]

I noticed that selecting Edit>Show Completions works as expected on Python 3.10.2 and macOS 12.1 after bpo-40128 was resolved.

But trying the default keyboard shortcut ctrl+S only highlights the edit menu but doesn't work.

I understand that it's supposed to be ctrl+space because that's how it works on windows and it also works in macOS after disabling the default behavior for ctrl+space but this doesn't highlight the edit menu.

On the original issue this behavior was also described but now the issue is closed and the behavior is the same.

So ctrl+S highlights the edit menu but doesn’t show completions and ctrl+space shows completions but has a conflict with the default macOS keyboard shortcuts and is not the shortcut specified on the edit menu and it doesn’t highlight it.

[terryjreedy]

I believe that this is a subset of bpo-18444. There are other shortcut that 'flash' a menu entry but do nothing. But I would consider a fix for this short of fixing everything.

How do you disable the default for ^space? In mac settings or tkinter (tk) settings?