tkinter style map return value in alt theme

[misianne]

BPO	43217
Nosy	@serhiy-storchaka
Superseder	bpo-42328: ttk style.map function incorrectly handles the default state for element options.

^{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 2021-02-14.15:42:42.647>
created_at = <Date 2021-02-14.00:43:47.161>
labels = ['3.8', 'type-bug', 'expert-tkinter']
title = 'tkinter style map return value in alt theme'
updated_at = <Date 2021-02-14.15:42:42.646>
user = 'https://bugs.python.org/misianne'

bugs.python.org fields:

activity = <Date 2021-02-14.15:42:42.646>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2021-02-14.15:42:42.647>
closer = 'serhiy.storchaka'
components = ['Tkinter']
creation = <Date 2021-02-14.00:43:47.161>
creator = 'misianne'
dependencies = []
files = []
hgrepos = []
issue_num = 43217
keywords = []
message_count = 5.0
messages = ['386930', '386946', '386949', '386953', '386955']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'misianne']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = '42328'
type = 'behavior'
url = 'https://bugs.python.org/issue43217'
versions = ['Python 3.8']

[misianne]

The return value for ttk.style().map('Treeview') is wrong for the 'background' value in the 'alt' theme: tuple are missing.

Tcl alt Treeview map:

-foreground {disabled #a3a3a3 {!disabled !selected} black selected #ffffff}
-background {disabled #d9d9d9 {!disabled !selected} #ffffff selected #4a6984}

tkinter alt Treeview map:

{
'foreground': [('disabled', '#a3a3a3'), ('!disabled', '!selected', 'black'), ('selected', '#ffffff')],
'background': ['disabled', '#d9d9d9', '!disabled !selected', '#ffffff', 'selected', '#4a6984']
}

It should be:

'background': [('disabled', '#d9d9d9'), ('!disabled !selected', '#ffffff'), ('selected', '#4a6984')]

[serhiy-storchaka]

What is our OS and Python version. I cannot reproduce this on Linux, perhaps it is OS-specific.

Try to test with the latest Python release. Maybe this bug was fixed in bpo-42328.

[misianne]

My os is windows 7, Python 3.8.6.
Obviously, I can't test it on 3.9+.

[misianne]

Tested W10 Python 3.9.1: map output is OK. It is a problem of Python 3.8.6 under W7.

[serhiy-storchaka]

Tested on Python 3.8.6 and 3.8.7+, Windows 10. On 3.8.6 the bug is reproduced, on 3.8.7+ all works as expected.