[issue30853] IDLE: configdialog -- factor out Tracer subclass

[Terry J. Reedy]

Terry J. Reedy added the comment:


New changeset 5b59154c0d3d91c0766b9177f6b737b1abcbf3f6 by Terry Jan Reedy (csabella) in branch 'master':
bpo-30853: IDLE: Convert font and general vars to use VarTrace (#2914)
https://github.com/python/cpython/commit/5b59154c0d3d91c0766b9177f6b737b1abcbf3f6


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