IDLE test failing only when called by itself: HighPageTest.test_highlight_target_text

IDLE test failing only when called by itself: HighPageTest.test_highlight_target_text_mouse

BPO	33951
Nosy	@terryjreedy, @taleinat, @miss-islington
PRs	bpo-33951: IDLE test_configdialog: call page.update() in setUpClass #7892 Enable GUI testing on Travis Linux builds via Xvfb #7887 [3.7] bpo-33951: IDLE test_configdialog: call page.update in setUpClass (GH-7892) #7896 [3.6] bpo-33951: IDLE test_configdialog: call page.update in setUpClass (GH-7892) #7897

^{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 2018-06-24.21:09:52.964>
created_at = <Date 2018-06-24.06:17:16.161>
labels = ['3.8', 'expert-IDLE', 'type-bug', '3.7']
title = 'IDLE test failing only when called by itself: HighPageTest.test_highlight_target_text_mouse'
updated_at = <Date 2018-06-24.21:09:52.963>
user = 'https://github.com/taleinat'

bugs.python.org fields:

activity = <Date 2018-06-24.21:09:52.963>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2018-06-24.21:09:52.964>
closer = 'terry.reedy'
components = ['IDLE']
creation = <Date 2018-06-24.06:17:16.161>
creator = 'taleinat'
dependencies = []
files = []
hgrepos = []
issue_num = 33951
keywords = ['patch']
message_count = 4.0
messages = ['320357', '320385', '320387', '320388']
nosy_count = 3.0
nosy_names = ['terry.reedy', 'taleinat', 'miss-islington']
pr_nums = ['7892', '7887', '7896', '7897']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue33951'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']