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From: martin rudalics <rudalics@gmx.at>
Newsgroups: gmane.emacs.devel
Subject: Re: Bidi reordering engine upgraded
Date: Fri, 17 Oct 2014 13:42:12 +0200
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 > This is because to the human eye pixels are similar to points in math
 > (i.e.has location, does not have extent).  Therefor, a mental "magnifying
 > glass" (in order to be useful) needs to preserve the point-like property
 > of pixels unaffected from the "zoom factor".
 >
 > Which means that what counts for line length is not number of pixels
 > but the spaces between.  See line of length 10, magnified:
 >
 >      0   1   2   3   4   5   6   7   8   9   0
 >      *   *   *   *   *   *   *   *   *   *   *

I doubt my eye (and whatever there's left behind it) would consider

   0
   *

having zero extent.

martin