IDLE: Restore or keep calltip when needed

GitHub fields:

assignee = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2020-11-02.05:24:17.048>
labels = ['expert-IDLE', 'type-bug', '3.10']
title = 'IDLE: Restore or keep calltip when needed'
updated_at = <Date 2020-11-02.07:52:09.289>
user = 'https://github.com/terryjreedy'

bugs.python.org fields:

activity = <Date 2020-11-02.07:52:09.289>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2020-11-02.05:24:17.048>
creator = 'terry.reedy'
dependencies = []
files = []
hgrepos = []
issue_num = 42239
keywords = ['patch']
message_count = 3.0
messages = ['380180', '380190', '380191']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'taleinat']
pr_nums = ['23098', '23100']
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue42239'
versions = ['Python 3.10']