SaveAs on macOS Catalina.

[Terry Reedy]

https://bugs.python.org/issue40553

At least a couple of people have had problems using SaveAs from IDLE 
when running on macOS Catalina.  But Ned Deily cannot reproduce the 
issue.  I cannot because I have refused the buggy 'upgrade'.  We could 
use more data.  What do other Catalina Python users experience?

If not an IDLE user, the experiment is easy.

In terminal:
$ python3 -m idlelib

In IDLE:
File => New
File => SaveAs

In the macOS saveas dialog:
Enter a minimal name that does not match an existing .py name in 
Documents.  Hit [Save] button.  Does the dialog save and close, or does 
it clear the Document content list and freeze?

The three Apple apps I looked at, Safari, Maps, and Keynote do not 
display folder contents.  This might be the problem.  What do other Mac 
apps do?

--
Terry Jan Reedy