[Users] Upper-face reflection in ReflectionSymmetry.

[Frank Loeffler]

On Wed, Sep 29, 2010 at 03:56:31PM +0200, Eloisa Bentivegna wrote:
> I propose the attached patch. In brief, since the loop runs over the
> "source" points in descending order and the "destination" points in
> ascending order, then the index offset between the two sets should
> just be 2 (or 1 if one is staggering the origin), rather than twice
> the ghost size as in the lower-face case.
> 
> The change affects branches that are only executed upon
> reflection_upper_*, so most people won't see a difference. Any
> input?

I believe the patch is correct. However, it needed some serious
head-wrapping on my side, so that I would like to have someone else
look at the patch as well.

Frank

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