[issue17535] IDLE: Add an option to show line numbers along the left side of the editor window, and have it enabled by default.

[Saimadhav Heblikar]

Changes by Saimadhav Heblikar <saimadhavheblikar at gmail.com>:


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nosy: +taleinat

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17535>
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