[issue3926] Idle doesn't obey the new improved warnings arguements

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

This is already corrected by r66922 (issue3391), but the patches are
different and there are some things I don't like in the present
implementation:

- in idle_showwarning, the "file" argument is ignored and always
replaced by warning_stream.
- warnings.formatwarning is passed a "file" argument: this could fail,
but works only because the function is monkey-patched. But "file" is not
even used there!

The attached patch seems better, but does not apply cleanly any more.

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nosy: +amaury.forgeotdarc

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