[XeTeX] Unaligned combining diacritic

[Pander]

Hi all,

For FreeMono I can get combining diacritic mark exactly over the
previous glyph but this does not work with FreeSerif, FreeMono DejaVu
Serif, DejaVu Sans and DejaVu Sans Mono. Please see the attachement.

Is this a font issue, fontspec issue or (Xe)TeX issue?

Thanks,

Pander

\documentclass{article}
\usepackage{xltxtra}
\begin{document}
\noindent\fontspec{FreeMono}◌̀ à\\%U+25CC U+0300
◌́\\%U+25CC U+0301
◌̂ â\\%U+25CC U+0302
◌̃\\%U+25CC U+0303
◌̄\\%U+25CC U+0304
◌̅\\%U+25CC U+0305
\noindent\fontspec{FreeSerif}◌̀ à\\%U+25CC U+0300
◌́\\%U+25CC U+0301
◌̂ â\\%U+25CC U+0302
◌̃\\%U+25CC U+0303
◌̄\\%U+25CC U+0304
◌̅\\%U+25CC U+0305
\noindent\fontspec{FreeSans}◌̀ à\\%U+25CC U+0300
◌́\\%U+25CC U+0301
◌̂ â\\%U+25CC U+0302
◌̃\\%U+25CC U+0303
◌̄\\%U+25CC U+0304
◌̅\\%U+25CC U+0305
\noindent\fontspec{DejaVu Sans}◌̀ à\\%U+25CC U+0300
◌́\\%U+25CC U+0301
◌̂ â\\%U+25CC U+0302
◌̃\\%U+25CC U+0303
◌̄\\%U+25CC U+0304
◌̅\\%U+25CC U+0305
\noindent\fontspec{DejaVu Serif}◌̀ à\\%U+25CC U+0300
◌́\\%U+25CC U+0301
◌̂ â\\%U+25CC U+0302
◌̃\\%U+25CC U+0303
◌̄\\%U+25CC U+0304
◌̅\\%U+25CC U+0305
\noindent\fontspec{DejaVu Sans Mono}◌̀ à\\%U+25CC U+0300
◌́\\%U+25CC U+0301
◌̂ â\\%U+25CC U+0302
◌̃\\%U+25CC U+0303
◌̄\\%U+25CC U+0304
◌̅\\%U+25CC U+0305
\end{document}


--------------------------------------------------
Subscriptions, Archive, and List information, etc.:
  http://tug.org/mailman/listinfo/xetex