[XeTeX] XeTeX and "ignore sub" substitution rules

[Khaled Hosny]

On Thu, Dec 01, 2011 at 07:59:14AM -0600, mskala at ansuz.sooke.bc.ca wrote:
> On Wed, 30 Nov 2011, Apostolos Syropoulos wrote:
> > did produce the expected results with say XeTeX that comes with
> > TeXLive 2009. I will give more details later on.
> 
> The item I found in the ICU issue tracker suggests the bug was introduced
> in their code base on October 28, 2008

Link?