[3.6] bpo-30853: IDLE: Convert font and general vars to use VarTrace … #2935
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…(GH-2914)
Instance tracers manages pairs consisting of a tk variable and a
callback function. When tracing is turned on, setting the variable
calls the function. Test coverage for the new class is 100%.
(cherry picked from commit 5b59154)
https://bugs.python.org/issue30853