[issue25036] IDLE - infrastructure changes so editors don't assume they're in a toplevel

[Terry J. Reedy]

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


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nosy:  -kbk, roger.serwy
versions: +Python 3.10 -Python 3.6, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25036>
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