Terry J. Reedy <tjre...@udel.edu> added the comment:

I just updated my Macbook to Mohave.  As implied, I do not see this on 
installed 3.7.1 with 8.6.8.  But this is a heads-up for future releases.  
Someone with both a Mac Python development environment + tip 8.6 would have to 
look at this now.

When the packaged tcl/tk in the repository is updated, 
idlelib/idle_test/htest.py should be run (in addition to test/test_idle.py) to 
see if the new tcl/tk introduces any visual artifacts.  Htest passes 
'htest=True' to ConfigDialog.__init__, but that only affects dialog placement.  
 Kevin, can you run htest on your system?

I don't understand "the dialog's [wm transient] implementation is part of the 
issue; the parent windows for the dialog are not hidden when run against the Tk 
tip,"  The transient call is 'self.transient(parent)' and the parent is the 
editor-based window, which is not blank and which should not be hidden.  If tk 
adds a new 3rd blank window, that seems like a tk bug to me.

----------
nosy: +ned.deily, taleinat

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<https://bugs.python.org/issue35387>
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