TTK Treeview alternating row color not working

[Mookiefer]

BPO	37767
Nosy	@zware

^{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 2019-08-05.21:00:49.350>
created_at = <Date 2019-08-05.20:40:23.874>
labels = ['3.7', 'type-bug', 'expert-tkinter']
title = 'TTK Treeview alternating row color not working'
updated_at = <Date 2019-08-05.21:00:49.339>
user = 'https://bugs.python.org/Mookiefer'

bugs.python.org fields:

activity = <Date 2019-08-05.21:00:49.339>
actor = 'zach.ware'
assignee = 'none'
closed = True
closed_date = <Date 2019-08-05.21:00:49.350>
closer = 'zach.ware'
components = ['Tkinter']
creation = <Date 2019-08-05.20:40:23.874>
creator = 'Mookiefer'
dependencies = []
files = []
hgrepos = []
issue_num = 37767
keywords = []
message_count = 2.0
messages = ['349071', '349074']
nosy_count = 2.0
nosy_names = ['zach.ware', 'Mookiefer']
pr_nums = []
priority = 'normal'
resolution = 'third party'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue37767'
versions = ['Python 3.7']

[Mookiefer]

The default installation of Python3.7 on all my Win10 machines has a ttk theme file that disables treeview alternating row colors. The specific file for me is "vistaTheme.tcl" located at "C:\Program Files\Python37\tcl\tk8.6\ttk". In the #Treeview section of the file the "ttk::style map Treeview" line needed to be changed from:

ttk::style map Treeview \
-background [list disabled $colors(-frame)\
{!disabled !selected} $colors(-window) \
selected SystemHighlight] \
-foreground [list disabled $colors(-disabledfg) \
{!disabled !selected} black \
selected SystemHighlightText]

Changed to:

ttk::style map Treeview
-background [list selected SystemHighlight]
-foreground [list selected SystemHighlightText]

Essentially all the "disabled" parts needed to be removed.

[zware]

That file is part of Tcl/Tk and just bundled with Python on Windows; please raise an issue on the Tk issue tracker (which appears to be here: https://core.tcl-lang.org/tk/ticket). If and when the change is released in a new version of Tcl/Tk, please feel free to open a new issue here requesting that we update to that version.