Good morning! This report by Github user SverreStausland has been lingering on the Luaotfload tracker for a while: There appears to be a difference between how certain faces of the Libertine family handle the placement of diacritics.
With Version 5.1.2 of the family [0], the "RZI" version
(fullname: “Linux Libertine O Semibold Italic”) shows a different
behavior than its “RZ” companion (“Linux Libertine O Semibold”).
Short demonstration in Context:
\definefontfeature [ourfeats] [default] [mode=node]
\starttext
\start \definedfont [file:LinLibertine_RI.otf*ourfeats] V\char"0306 \stop
\start \definedfont [file:LinLibertine_RZI.otf*ourfeats] V\char"0306 \stop
\stoptext
Note the misaligned combining breve above the latter. An
equivalent test for Plain [1] shows that the correct position
information is there somewhere in the font, since the Xetex
engine typesets it correctly.
Best regards,
Philipp
[0] MD5 hashes of the files:
4bfd3481c1486f5d1ea13304981df7a6 LinLibertine_RZI.otf
153765bd2b29d6026fb2fa0b198a4995 LinLibertine_RZ.otf
[1] https://bitbucket.org/phg/lua-la-tex-tests/src/tip/pln-diacritics-1.tex
pgpn9cMzY_R_j.pgp
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