New submission from Terry J. Reedy <tjre...@udel.edu>:

I updated to Mohave and did *not* switch to new dark theme.]
I installed 64 bit 3.7.2rc1.  Start IDLE.

import tkinter
root = tkinter.Tk()

Black on white Tk window appears.  Move mouse until resize arrow appears. Left 
click.  Move mouse.  Window turns uniformly black.  Ugh.  Cannot see contents 
that am trying to resize to.  Release button.  Background returns to white.  
Same thing happens with Text added, and hence with IDLE windows and such 
dialogs as can be resized.

----------
components: Tkinter, macOS
messages: 331769
nosy: ned.deily, ronaldoussoren, terry.reedy, wordtech
priority: release blocker
severity: normal
stage: needs patch
status: open
title: Mac: tkinter windows turn black while resized
type: behavior
versions: Python 3.6, Python 3.7, Python 3.8

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue35485>
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