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

After patching my 3.7.2 Macbook installation, and reviewing #20406 which added 
the icon code, I understand this issue better.  IDLE, while open and unlike 
other Mac apps I later tested, was replacing the initial Mac IDLE app dock icon 
(tilted page with double snakes and pen) with the cross-platform IDLE icon.

This was an accidental side-effect.  #20406 replaced the tk icon on the title 
bar of IDLE windows with the little IDLE icons.  Before merging, I checked that 
this did not affect the large app icons on the taskbar.  I assume that Serhiy 
did the equivalent on Linux.  I don't think that the patch was visually checked 
on Mac.

After the patch, I noticed that the normal behavior with macOS is to put a 
barely visible (to my eyes) black dot under dock icons when an app is open.  On 
Windows, the icon is also left as is, but a much more visible icon-width 
underline is added while open.  I approve of removing the while-open overlay on 
Mac and don't think it needs to be reinstated.
---

Kevin, I suspect that higher resolution .pngs (64px, 128px?) would help on 
other *nixes, (and perhaps Windows), but this would be another issue.  Whatever 
is in the .ico file for Windows looks awful in the corner of IDLE windows on my 
system, but this also is another issue.

----------
resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue32129>
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