Fix emulated paper size bug on OSX
Fix emulated paper size bug on OSX

On windows, the monospace font of width w pixels per character will take up N*w pixels to draw N characters.  But on OSX, that wasn't true.  What was supposed to be 8 pixels/char averaged 8.3 pixels/char across 80 characters.  As a result, a wide line could print right off the end of the paper, breaking the illusion.

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