[issue2705] incompatible change to warnings.showwarning

[Jean-Paul Calderone]

Jean-Paul Calderone <exarkun at divmod.com> added the comment:

By the way, I just noticed that Lib/idlelib/PyShell.py includes an
override of `showwarning´ which is defined with the old signature.

I ran idle from trunk and verified that is indeed breaks warning reporting.

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