[racket] custom gap-size in slideshow

We could add a `#:gap-size' optional argument to `slide' and/or a
`current-gap-size' parameter. Does that sound right?

At Sun, 20 May 2012 20:54:19 +0200, Laurent wrote:
> Hi,
> 
> It seems that items and subitems in slideshow are separated by a factor of
> gap-size.
> The default is good but often I need to resize the (sub)items, but the
> gap-size  (which should dynamically depend on the font-size) does not
> change, which creates big gaps between items.
> Is there a way to change that?
> (I mean, I could use vl-append myself, but then I lose the 'next / 'alts
> staging functionality).
> 
> Laurent
> P.S.: Slideshow is awesome, truly.
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