Dear LyX devels,
The current handling of combining Unicode characters clashes with the
handling of LaTeX font-encoding changes ("textgreek" and "textcyr"
in LYXDIR/unicodesymbols).
Current behaviour
=================
Conversion of a document with combining accents on non-Latin
characters results in these accents placed *before* (instead of *above*)
the to-be-accented character or failure:
Input LaTeX PDF (look) text-extract
Latin: x̃ x̊ \~{x} \r{x} x̃ x̊ x ˚ ˜x
Greek: α̃ α̊ \~{\textgreek{a}} ~α ° α ˜α ˚α
\r{\textgreek{a}}
Kyrillic: и̃ и̊ \~{\textcyr{\char232}} fails¹
\r{\textcyr{\char232}}
Used programs: LyX 1.6.7, pdflatex, evince.
¹ With \usepackage[T2A,T1]{fontenc} in the LaTeX preamble, the PDF
output is ˜и ˚и and the text extract è ˚è.
With \usepackage{cmap}\usepackage[T2A,T1]{fontenc}, the PDF looks like
~и °и and the text extract is˜и ˚и.
Proposed solution
=================
Inverting font-selection and accent macro in the generated LaTeX source:
Greek: α̃ α̊ \textgreek{\~a} \textgreek{\r{a}}
Due to a re-definition in LyX's Greek font setup, accent-tilde
(perispomeni) only works with supported chars and only if there
are no braces around the to-be-accented character.
Kyrillic: и̃ и̊ \textcyr{\~{\cyri}} \textcyr{\r{\cyri}}
Accenting cyrillic characters requires the use of the symbolic
names. This works fine with \usepackage[T2A]{fontenc} or
\input{t2aenc.def} instead of
\AtBeginDocument{\DeclareFontEncoding{T2A}{}{}} (see
Document>Settings>LaTeX-Preamble).
This is reported at http://www.lyx.org/trac/ticket/6463
where you can also find the LyX example file
accents-with-greek-and-cyrillic.lyx
Günter
