At Fri, 6 Sep 2013 16:51:56 -0700,
tim Rowledge wrote:
> 
> On 06-09-2013, at 3:26 PM, Yoshiki Ohshima <Yoshiki.Ohshima at acm.org> wrote:
> 
> > At Fri, 6 Sep 2013 23:02:57 +0200,
> > Nicolas Cellier wrote:
> >> 
> >> Hi Yoshiki,
> >> I also note that there is a presentation and presentationLine in
> >> MultiCharacterScanner, could you tell a word about theses inst. vars.?
> > 
> > That (IIRC) was also something to do with the mapping from the logical
> > sequence of code points (that is what a Unicode string is) to the list
> > of "characters" that can be used to fetch the glyphs.   IOW,
> > "presentation" is something created by looking at combinations in the
> > logical sequence.
> > 
> > Again, we did not go too far; I think we supported a simple accented
> > characters but not much more.
> 
> So far as I could tell from looking at senders and implementors,
> there wasn't really any use made of 'presentation' and not much of
> 'presentationLine'; certainly little enough that my *guess* would be
> they could go away without changing anything.

In the Etoys image, #addCharToPresentation: is called from
#scanMultiCharactersCombiningFrom:...., and that is dispatched from
Unicode class>>scanSelector.  But I guess the mechanism was removed
from the trunk at some point in the past.

-- Yoshiki