[lltx] Misplaced combined diacritics

Khaled Hosny khaledhosny at eglug.org
Fri Oct 1 16:20:01 CEST 2010

```On Fri, Oct 01, 2010 at 03:24:16PM +0200, Khaled Hosny wrote:
> On Fri, Oct 01, 2010 at 03:11:16PM +0200, Khaled Hosny wrote:
> > On Fri, Oct 01, 2010 at 03:04:16PM +0200, Arthur Reutenauer wrote:
> > >   The more general issue is with fontspec for LuaTeX not enabling the
> > > 'ccmp' OpenType feature by default, I guess.
> >
> > I'll check, if that is the case it should be easily fixable.
>
> No, it has nothing to do with ccmp which we already turn on by default,
> actually it wouldn't make any difference since the ccmp table in the
> font is used to decompose pre composed glyphs, not the other way around,
> and all diacritics are positioned by mark positioning, and some bug is
> causing the marks to be positioned on the wrong glyph, something to talk

Something odd related to directionality is happening here, I was
wondering why my latest Arabic font with heavy mark positioning is
working fine, now if you set direction to right-to-left the marks are
positioned properly: