Normalizing Syriac

[Richard Wordingham]

On Mon, 26 Apr 2021 22:21:08 -0600
Doug Ewell via Unicode <unicode at unicode.org> wrote:

> Richard Wordingham wrote:
> 
> > In an OpenType font, I would combine RISH with COMBINING DIAERESIS
> > using a substitution lookup that ignores marks below.  
> 
> I thought the number one goal of Unicode was to make text encoding
> independent of font selection.

Which is why I would do it that way.  Those who wrote the fonts seem to
have assumed that these two characters would wind up adjacent.

It isn't always trivial to ensure that canonically equivalent sequences
render the same.  The rendering engine can make a big difference to how
much work has to be done by the tables in the font.

Richard.