Changing numbers font features while changing shape

Question

I am writing a document with the main font set up with old numbers, but I would like to have the "normal" style in the tables. This works but one particular table has some of the numbers in italic and somehow I cannot find a way of changing the font feature for these.

It turns out that the table is irrelevant and using \itshape or \em or \textit{} in normal text give the same result:

\documentclass[preview,border=2px,12pt]{standalone}

\usepackage{fontspec}
\setmainfont [Numbers = {Proportional,OldStyle}]{Linux Libertine O}

\begin{document}

2189 89283 98239 8098 2983 098023 \textit{1392843902984u29830} {\itshape 1981987092183749280}

{
\addfontfeatures{Numbers={Lining,Monospaced}, ItalicFeatures={Numbers={Lining,Monospaced}}}
2189 89283 98239 8098 2983 098023 \textit{1392843902984u29830} \itshape 1981987092183749280
}

\end{document}

Any idea what I am doing wrong? Or have I hit a bug?

Answer 1

With XeLaTeX I get the warning

*************************************************
* fontspec warning: "icu-feature-not-exist-in-font"
* 
* OpenType feature 'Numbers=Lining,Monospaced' (+tnum) not available for font
* 'Linux Libertine O/BI' with script 'Latin' and language 'Default'.
*************************************************

that's probably the cause for this. I get the expected result by defining a new font family, instead of adding features on the fly:

\documentclass[varwidth,border=2pt,12pt]{standalone}

\usepackage{fontspec}
\defaultfontfeatures{Ligatures=TeX}
\setmainfont [Numbers = {Proportional,OldStyle}]{Linux Libertine O}
\newfontfamily{\libertinelf}{Linux Libertine O}

\begin{document}

2189 89283 98239 8098 2983 098023 \textit{1392843902984u29830} {\itshape 1981987092183749280}

{\libertinelf
2189 89283 98239 8098 2983 098023 \textit{1392843902984u29830} \itshape 1981987092183749280
}

\end{document}

Answer 2

Fontspec has some issues with lnum and tnum when already using Oldstyle numbers. One of the easiest ways to resolve this is by using the latest libertine package:

\documentclass[preview,border=2pt,12pt]{standalone}

\usepackage{libertine}

\begin{document}

2189 89283 98239 8098 2983 098023 \textit{1392843902984u29830} {\itshape 1981987092183749280}

\liningnums{%
    \addfontfeature{Numbers = Monospaced}
    2189 89283 98239 8098 2983 098023 \textit{1392843902984u29830} \itshape 1981987092183749280
}
\end{document}

Monospaced numbers also work (except for italic numbers):

Answer 3

Use libertine.sty:

\usepackage{libertine}
\begin{document}
 2189 89283 98239 8098 2983 098023 \textit{\libertineLF 1392 84390 29842 9830}
\end{document}