[issue24137] Force not using _default_root in IDLE

[Terry J. Reedy]

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

The net effect of this issue:

pyshell.main calls NoDefaultRoot() when running normally, when using a subprocess and testing is not set.  It does not call it when in -n mode since that would affect users.

idle_test.htest  calls NoDefaultRoot() unconditionally.  pyshell.main is not called.

test.test_idle sets testing to avoid the call when run by test.regrtest, to avoid failing the latter's changed-environment check.  But it does call NoDefaultRoot when run as __main__ and the tests are run by unittest.main.

Known dependencies on a default root have been removed.  It is unlikely that any are left.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue24137>
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