[issue34162] idlelib/NEWS.txt for 3.8.0 (and backports)

[Terry J. Reedy]

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

Follow-up to #30928.  First patch has to be backported by hand to adjust headers for each version.  After that, 2 blanks after uniform length separator allows auto backports, except for further version-specific header changes or code patches.

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stage: patch review -> needs patch

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<https://bugs.python.org/issue34162>
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