[issue21139] Idle: change default reformat width from 70 to 72

[Terry J. Reedy]

Terry J. Reedy added the comment:

I applied my patch as part of #21284. When I did so, I added 'limit=70' so that the tests pass otherwise unchanged. The only thing left here is to change config-main.def.

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<http://bugs.python.org/issue21139>
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