[issue43894] IDLE editor file minor refactoring

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

This started as an extraction and revision of changes in Tal's PR, one of which appeared to be an intended behavior change, that I requested there.  Paine may have expanded the scope more than I intended.  Will look soon.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43894>
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