Turtle uses the default root window

[serhiy-storchaka]

BPO	43937
Nosy	@serhiy-storchaka, @willingc, @miss-islington
PRs	bpo-43937: Fix the turtle module working with multiple root windows #25591 [3.9] bpo-43937: Fix the turtle module working with multiple root windows (GH-25591) #25593 [3.8] bpo-43937: Fix the turtle module working with multiple root windows (GH-25591) #25594

^{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 = <Date 2021-04-30.22:14:15.671>
created_at = <Date 2021-04-25.10:31:38.905>
labels = ['3.8', 'type-bug', 'library', '3.9', '3.10']
title = 'Turtle uses the default root window'
updated_at = <Date 2021-04-30.22:14:15.671>
user = 'https://github.com/serhiy-storchaka'

bugs.python.org fields:

activity = <Date 2021-04-30.22:14:15.671>
actor = 'terry.reedy'
assignee = 'none'
closed = True
closed_date = <Date 2021-04-30.22:14:15.671>
closer = 'terry.reedy'
components = ['Library (Lib)']
creation = <Date 2021-04-25.10:31:38.905>
creator = 'serhiy.storchaka'
dependencies = []
files = []
hgrepos = []
issue_num = 43937
keywords = ['patch']
message_count = 1.0
messages = ['391849']
nosy_count = 4.0
nosy_names = ['gregorlingl', 'serhiy.storchaka', 'willingc', 'miss-islington']
pr_nums = ['25591', '25593', '25594']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue43937'
versions = ['Python 3.8', 'Python 3.9', 'Python 3.10']

[serhiy-storchaka]

Some of methods in the turtle module implicitly use the default root window: call global mainloop() and create PhotoImage without specifying the master window. It can cause a problem if multiple root windows are used.