I apologize for the changing colors, since xor isn't available with this simple method of drawing the lines, it's the only way to be sure to get contrast. I considered making the color depend on e.g., whether SHIFT is pressed, but if Tk provides this information to a window that doesn't have focus, I overlooked it in the manpages.
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Entry first conceived on 29 April 2006, 21:58 UTC, last modified on 15 January 2012, 3:46 UTC
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