Re: Bidi reordering engine upgraded

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 17 Oct 2014 15:21:39 +0200
> From: grischka <grishka@gmx.de>
> Cc: emacs-devel@gnu.org
> 
> martin rudalics wrote:
> >  > 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.
> 
> Nobody would consider a single pixel to mean anything in particular.
> For that to happen it needs to be placed in relation to other pixels.
> 
> For example two pixels can make a line already.

We are talking about a single-pixel vertical line (whose height is
more than 1 pixel).  Such a line definitely means something.