[issue24137] Force not using _default_root in IDLE

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I ran IDLE and tests and found yet few needed changes.

NoDefaultRoot() should be called only if run IDLE with a subprocess support.

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Added file: http://bugs.python.org/file43489/nodefaultroot2.diff

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<http://bugs.python.org/issue24137>
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