[issue28840] IDLE: Document tk's long line display limitation

[Terry J. Reedy]

Changes by Terry J. Reedy <tjreedy at udel.edu>:


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stage:  -> test needed
title: IDLE not handling long lines correctly -> IDLE: Document tk's long line display limitation
versions: +Python 2.7, Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28840>
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