XeTeX loads Lido STF incorrectly

Question

This is a followup to Are the Lido STF font installation instructions up-to-date?. I have the Lido STF fonts installed as described there. I also have them installed in OpenType format in C:\Windows\Fonts. I'm using MiKTeX.

This code compiled with PDFLaTeX gives correct output, while compiling with XeLaTeX makes the first sentence bold italic and the second sentence regular.

\documentclass{article}
\usepackage{iftex}
\ifXeTeX
    \usepackage{fontspec}
    \setmainfont[Ligatures=TeX]{Lido STF}
\else
    \usepackage[utf8]{inputenc}
    \usepackage[T1]{fontenc}
    \renewcommand{\rmdefault}{sld}
\fi

\begin{document}
{\itshape This is supposed to be italic.}
{\bfseries And this bold.}

\end{document}

Additionally Adobe Reader tells me that even when I use XeTeX, the Type1 fonts are used.

What is the problem and how do I fix it permanently?

Answer 1

I ended up writing a style file for loading the font (save as lidostf.sty):

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{lidostf}[2013/11/12]
\RequirePackage{iftex}
\ifXeTeX
    \RequirePackage{unicode-math}
    \setmainfont[Extension=.otf,
                 BoldFont = *bold,
                 ItalicFont = *italic,
                 BoldItalicFont = *bolditalic,
                 Scale=0.93,
                 Ligatures=TeX]
                 {lidostf}
    \setmathfont{XITS Math} % or TeX Gyre Termes Math
\else
    \renewcommand{\rmdefault}{sld}
    \RequirePackage[cmintegrals]{newtxmath}
\fi

These issues are yet to be solved:

• How to choose between XITS Math and TeX Gyre Termes Math? Functional difference between newtx, Times, Termes, STIX, XITS; text and math
• When using PDFTeX, how to scale the text font down or the math font up so that their height matches?