bug#33729: 27.0.50; Partial glyphs not rendered for Gujarati with Harfbuzz enabled (renders fine using m17n)

[Khaled Hosny <dr.khaled.hosny@gmail.com>]

I’m sub-classing the default Unicode functions, so for the callback we
don’t implement the default implementation will be used already.

On Sat, Dec 22, 2018 at 10:27:06AM -0500, Behdad Esfahbod wrote:
> I suggest you enabled UCDN.
> 
> On Sat, Dec 22, 2018 at 10:15 AM Khaled Hosny <dr.khaled.hosny@gmail.com>
> wrote:
> 
> > On Sat, Dec 22, 2018 at 12:11:15PM +0200, Eli Zaretskii wrote:
> > > > Date: Sat, 22 Dec 2018 11:06:44 +0200
> > > > From: Khaled Hosny <dr.khaled.hosny@gmail.com>
> > > > Cc: Glenn Morris <rgm@gnu.org>, far.nasiri.m@gmail.com,
> > behdad@behdad.org,
> > > >     33729@debbugs.gnu.org, kaushal.modi@gmail.com
> > > >
> > > > > Alternatively, we could just use HarfBuzz’s own built in ucdn-based
> > > > > Unicode function for this. The only reason for overriding this in
> > Emacs
> > > > > was to keep HarfBuzz and Emacs Unicode support in sync, but if we are
> > > > > going to duplicate the Unicode script data then better use what
> > HarfBuzz
> > > > > has.
> > > > >
> > > > > I’m going to try this now.
> > > >
> > > > I pushed a commit to harfbuzz branch that I think fixes this issue now.
> > >
> > > Thanks.
> > >
> > > There's a FIXME in the change you pushed (which I believe just
> > > repeats what was already in the previous version).  Ca you tell more
> > > about the problem we need to fix there?
> >
> > We need a way to get Unicode composition and decomposition for the
> > a given character (implementing the uni_compose and uni_decompose
> > functions I deleted). I recall you suggested something earlier that I
> > tried but couldn’t get to work, the exact detail escapes me.
> >
> 
> 
> -- 
> behdad
> http://behdad.org/