[issue31421] IDLE doc: add section on developing tkinter apps.

[Terry J. Reedy]

Terry J. Reedy added the comment:


New changeset 98758bc67fb39b74bab368bef8ff3b34554c77c8 by Terry Jan Reedy in branch 'master':
bpo-31421: Document how IDLE runs tkinter programs. (#3513)
https://github.com/python/cpython/commit/98758bc67fb39b74bab368bef8ff3b34554c77c8


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