[luatex] LuaTeX 1.10.1-svn7138 breaks fontspec package

[Khaled Hosny]

On Wed, May 01, 2019 at 03:10:31AM +0200, Khaled Hosny wrote:
> On Wed, May 01, 2019 at 02:55:18AM +0200, Khaled Hosny wrote:
> > Hi all,
> > 
> > Something in the svn 7138 revision breaks fontspec package. In the
> > attached document the first line is fine, but the second line will give
> > the warning:
> > 
> > Package fontspec Warning: Font "amiri-regular" does not contain requested
> > (fontspec)                Script "Latin".
> > 
> > It seems in the second line fontspec is checking with an empty font
> > csname. I couldn’t manage to come with a plain TeX file that shows the
> > issue, but the warning goes away if I revert this chunk:
> > https://github.com/TeX-Live/luatex/commit/e4181e6126b060645f257ec64043bc9eae699576#diff-a34a3b72620549296a59c3bcb1010ff8L218
> 
> Still no plain TeX document, but the attached patch fixes the issue; “t”
> should be flushed only if it isn’t the same string number as “d”
> otherwise the code is flushing the already used string.

ltexlib.c probably needs the same change as well, but I don’t know how
to test that code.

Regards,
Khaled