[issue30993] IDLE: Document and fix configdialog font tests.

[Terry J. Reedy]

Terry J. Reedy added the comment:


New changeset 5aa3bf041de5ee90ccbfcff103dcf3e54c5af237 by Terry Jan Reedy in branch '3.6':
[3.6] bpo-30993: IDLE - Improve configdialog font page and tests.  (GH-2818) (#2826)
https://github.com/python/cpython/commit/5aa3bf041de5ee90ccbfcff103dcf3e54c5af237


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