Hello,
Most TrueType fonts fail to output Unicode composite characters properly
when using LuaTeX while they do a good job with XeTeX.
Let's take <e-acute> as an example. In principle, <e-acute> can be coded
as U+00E9 or as U+0065 U+0301 (e+acute). The following example compiled
with LuaTeX shows differences which depend on the font:
--8<---------------cut here---------------start------------->8---
\input luaotfload.sty
\font\verdana={Verdana}
\font\georgia={Georgia}
\font\arial={Arial}
\font\roboto={Roboto}
% été is coded as U+00E9 U+0074 U+0065 U+0301
% (visible using emacs for instance).
\verdana e^^^^0301, été % misplaces accent
\georgia e^^^^0301, été % swallows accent
\arial e^^^^0301, été % places accent (a lot) too high
\roboto e^^^^0301, été % correct
\bye
--8<---------------cut here---------------start------------->8---
The corresponding example for XeTeX would be:
--8<---------------cut here---------------start------------->8---
\input font-change-xetex
\myzfont {Verdana}{10}{} e^^^^0301, été % correct
\myzfont {Georgia}{10}{} e^^^^0301, été % correct
\myzfont {Arial}{10}{} e^^^^0301, été % correct
\myzfont {Roboto}{10}{} e^^^^0301, été % correct
\bye
--8<---------------cut here---------------start------------->8---
Should the TTF fonts be blamed or is it a LuaTeX bug? None of the
OpenType fonts I tried showed differences between the two encodings for
<e-acute> both with LuaTeX and XeTeX.
Thanks in advance for your comments and/or workarounds!
--
Daniel Flipo
