[issue30495] IDLE: modernize textview module

[Terry J. Reedy]

Terry J. Reedy added the comment:

I plan to merge when checks pass.

Not reusing module names avoids noise when grepping for a module name ;-).  A final search for 'textview', match case, whole word, gave 18 hits, which were easy to check.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30495>
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