Kevin Walzer added the comment:
This can probably be fixed by setting this key in the app's info.plist file:
Under the hood, Tkinter/Tk-Cocoa uses CoreText to render text, and I understand
this to adapt to high-res displays out of the box--as long as the proper key is
set in the plist file.
Only pixmaps/images require special developer handling to display properly on
Retina displays. As IDLE does not use any such graphics, it should be fine.
Can someone file a patch for the info.plist file, or at try editing the app's
info.plist file and then testing on a high-res display? I do not have access to
a Retina display machine on my system. Here are more details on how to enable
the key and test it:
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