[issue20406] Use application icon for IDLE

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Related but separate issue. A TreeWidget used for browsing files uses the
> old python.gif icon for .py files. I think we should switch to the modern
> one that you uploaded as python_16x16.gif. Agree?

Agree.

As for 2.7, we can use

    root.tk.call('wm', 'iconphoto', str(root), "-default", *icons)

In Ubuntu (and perhaps other Linux distributives), just main Python logo (as 
in favicon) is used as IDLE desktop icon. May be we should discuss IDLE icon 
and logo (which can be shown in the About window) on Python-Dev.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20406>
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