Re: Should editing and selection operate on grapheme clusters?

Agree. That's what CTL users want to see.
However, for Thai, Delete should delete a cluster,
but Backspace should delete a code point.
Moreover, mouse hit test (for click/select)
and Find should operate on cluster boundary too.
All is specified in Unicode (except Backspace
which whether it should delete a code point
or a cluster may depend on locale).

L. David Baron wrote:
> Should editing operations (caret movement, backspace, delete, and
> selection) operate on characters or grapheme clusters?  In our code they
> currently operate on characters, but I'd think that we'd probably want
> them to operate on grapheme clusters instead.
> 
> Part of the reason I think this is that I think we should expose the
> difference between composed and decomposed Unicode normalizations to the
> user as little as possible.  But even in cases where Unicode doesn't
> have composed characters, I'd think that it would make more sense for
> editing operations to operate on grapheme clusters.
> 
> I was thinking of filing bugs on this, but wanted to ask here first to
> see if others agree.
> 
> -David
> 


-- 
_/|\_ Samphan Raruenrom. http://www.osdev.co.th/