IDLE: search regex errors should be in/attached to search dialog

[roseman]

BPO	25178
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 = 'https://github.com/terryjreedy'
closed_at = None
created_at = <Date 2015-09-19.18:34:41.281>
labels = ['expert-IDLE', 'type-bug', '3.9']
title = 'IDLE: search regex errors should be in/attached to search dialog'
updated_at = <Date 2020-01-07.22:19:44.085>
user = 'https://github.com/roseman'

bugs.python.org fields:

activity = <Date 2020-01-07.22:19:44.085>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = False
closed_date = None
closer = None
components = ['IDLE']
creation = <Date 2015-09-19.18:34:41.281>
creator = 'markroseman'
dependencies = []
files = []
hgrepos = []
issue_num = 25178
keywords = []
message_count = 2.0
messages = ['251097', '359554']
nosy_count = 2.0
nosy_names = ['terry.reedy', 'markroseman']
pr_nums = []
priority = 'normal'
resolution = None
stage = 'test needed'
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue25178'
versions = ['Python 3.9']

[roseman]

Follow-on to bpo-25173, any regex errors are displayed by SearchEngine but they should be shown by the dialog where the user is typing the error. Either as a modal tkMessageBox attached to the dialog, or as an inline error in the dialog itself.

[terryjreedy]

I like the way that Open Module puts error messages in red under the entry box and allows users to correct without first clicking a modal message away. I would like to do the same here.