All standard keystrokes not recognized in IDLE dialogs on Mac

[roseman]

BPO	24812
Nosy	@terryjreedy, @roseman

^{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 2015-08-07.04:15:38.147>
labels = ['expert-IDLE', '3.9']
title = 'All standard keystrokes not recognized in IDLE dialogs on Mac'
updated_at = <Date 2019-09-19.18:44:47.174>
user = 'https://github.com/roseman'

bugs.python.org fields:

activity = <Date 2019-09-19.18:44:47.174>
actor = 'terry.reedy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2015-08-07.04:15:38.147>
creator = 'markroseman'
dependencies = []
files = []
hgrepos = []
issue_num = 24812
keywords = []
message_count = 4.0
messages = ['248166', '248228', '248238', '297336']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'markroseman']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = None
url = 'https://bugs.python.org/issue24812'
versions = ['Python 3.9']

[roseman]

Most of the dialogs in IDLE on OS X do respond to 'Return' key as equivalent to hitting OK, and Escape to hitting Cancel.

Guidelines also suggest that the Enter key (on numeric keypad) should work like 'Return', and Cmd-. (period) should work like Cancel. Doesn't happen now in any of the places I looked.

[roseman]

note that many of these are using 'simpledialog' which has that limitation

[terryjreedy]

Then either simpledialog should changed, or Idle should subclass or rewrite it to work as it should.

[terryjreedy]

query.Query has and will mostly replace tkinter.simpledialog bpo-27115.
This is partially a duplicate with respect to Query bpo-27621.