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

[Terry J. Reedy]

Terry J. Reedy added the comment:


New changeset 4d7807ab9ad9f990e948d250bbb390b23a790764 by Terry Jan Reedy (Miss Islington (bot)) in branch '3.6':
[3.6] bpo-31421: Document how IDLE runs tkinter programs. (GH-3513) (#3514)
https://github.com/python/cpython/commit/4d7807ab9ad9f990e948d250bbb390b23a790764


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