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bpo-6739: IDLE: Check for valid keybinding in config_keys (#2377)

Verify user-entered key sequences by trying to bind them with tk.
Add tests for all 3 validation functions.
Original patch by G Polo.  Tests added by Cheryl Sabella.
C
csabella committed
8c78aa70c888a370af18896a72cabd00e4120f09
Parent: af5392f
Committed by terryjreedy <tjreedy@udel.edu> on 6/26/2017, 4:55:48 AM