soul dropping some accented letters from the end of words

Question

I'm using soul to letterspace headings in a Hungarian document and compiling it with lualatex.

For some reason soul drops some of the accented letters at the end of a word, but not all. In the example below, only ő and ű are affected:

\documentclass{minimal}
\usepackage{fontspec}
\setmainfont[Ligatures = TeX]{TeX Gyre Pagella}
\usepackage{soul}
\begin{document}
\noindent
\so{áll llá ÁLL LLÁ}\\
\so{íll llí ÍLL LLÍ}\\
\so{űll llű ŰLL LLŰ}\\
\so{őll llő ŐLL LLŐ}\\
\so{üll llü ÜLL LLÜ}\\
\so{öll llö ÖLL LLÖ}\\
\so{úll llú ÚLL LLÚ}\\
\so{óll lló ÓLL LLÓ}\\
\so{éll llé ÉLL LLÉ}
\end{document}

sample letters

The question is not about ő/Ő, but rather depends on the fact that they are at the word border. Try with a final Ű, for example. Other accented letters seem to be unaffected. — egreg, Jan 14 '12 at 10:41
I've tracked down the problem to this: characters with Unicode > 255 don't appear. Indeed U+00FF is ÿ that is treated correctly, while U+0100, that is Ā, disappears. — egreg, Jan 14 '12 at 13:57
TODO \SOUL@ttwidth might also need to be changed, refer to https://tex.stackexchange.com/a/142764/250119 / https://tex.stackexchange.com/a/341062/250119 ■ in some special cases it might be simpler to avoid soul package entirely: letter spacing fonts - soul package and Cyrillic with xelatex - TeX - LaTeX Stack Exchange, — user202729, Nov 30 '22 at 09:36

egreg · Accepted Answer · 2018-04-24T21:53:55.963

The problem is in the font used for testing hyphenation. If you add

\makeatletter
\let\SOUL@tt\relax
\newfontface{\SOUL@tt}{FreeMono}
\makeatother

after loading soul the problem seems to disappear. It probably won't show again characters that are not in the \SOUL@tt font.

Full code:

\documentclass{article}
\usepackage{fontspec}
\setmainfont[Ligatures = TeX]{TeX Gyre Pagella}
\usepackage{soul}
\makeatletter
\let\SOUL@tt\relax
\newfontface{\SOUL@tt}{TeX Gyre Cursor}
\makeatother

\begin{document}
\noindent
\so{áll llá ÁLL LLÁ}\\
\so{íll llí ÍLL LLÍ}\\
\so{űll llű ŰLL LLŰ}\\
\so{őll llő ŐLL LLŐ}\\
\so{üll llü ÜLL LLÜ}\\
\so{öll llö ÖLL LLÖ}\\
\so{úll llú ÚLL LLÚ}\\
\so{óll lló ÓLL LLÓ}\\
\so{éll llé ÉLL LLÉ}
\end{document}

Of course, a better method would be to use microtype for such a job. — egreg, Nov 30 '22 at 10:19

soul dropping some accented letters from the end of words

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