Idle uses old showwarning signature

[schuppenies]

BPO	3391
Nosy	@brettcannon, @benjaminp
Files	idle.patch verify.py

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/benjaminp'
closed_at = <Date 2008-10-16.19:40:28.690>
created_at = <Date 2008-07-17.09:51:53.797>
labels = ['expert-IDLE', 'type-bug']
title = 'Idle uses old showwarning signature'
updated_at = <Date 2008-10-16.19:40:28.689>
user = 'https://bugs.python.org/schuppenies'

bugs.python.org fields:

activity = <Date 2008-10-16.19:40:28.689>
actor = 'benjamin.peterson'
assignee = 'benjamin.peterson'
closed = True
closed_date = <Date 2008-10-16.19:40:28.690>
closer = 'benjamin.peterson'
components = ['IDLE']
creation = <Date 2008-07-17.09:51:53.797>
creator = 'schuppenies'
dependencies = []
files = ['10926', '10927']
hgrepos = []
issue_num = 3391
keywords = ['patch']
message_count = 2.0
messages = ['69879', '74850']
nosy_count = 3.0
nosy_names = ['brett.cannon', 'benjamin.peterson', 'schuppenies']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue3391'
versions = ['Python 2.6', 'Python 3.0']

[schuppenies]

Idle does not use the 'line' argument for its showwarning function. This
results in the DeprecationWarning "functions overriding
warnings.showwarning() must support the 'line' argument", or, when
called from within Idle "TypeError: idle_formatwarning_subproc() takes
exactly 4 arguments (5 given)".

The error can be reproduced from within Idle as well as demonstrated
with verify.py.

The attached patch applies the behavior of the default warnings
implementation.

[benjaminp]

Thanks! Applied in r66922.