[issue30779] IDLE: configdialog -- factor out Changes class

[Terry J. Reedy]

Terry J. Reedy added the comment:


New changeset 24f2e19d68cc6ca563d2be5944d11d5f55a46918 by terryjreedy in branch 'master':
bpo-30779: News (#2627)
https://github.com/python/cpython/commit/24f2e19d68cc6ca563d2be5944d11d5f55a46918


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<http://bugs.python.org/issue30779>
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