When I combine \textsl \textbf and \hl from the soulutf8 package, the result is ugly. Some letters are degraded. By zooming or printing you can see that with the following code:
\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{color}
\usepackage{soulutf8}
\begin{document}
\large
\textsl{\textbf{{application module morphisme}}} % Correct
\textsl{\textbf{\hl{application module morphisme}}} % Ugly!
% — — — — — —
\end{document}
I'm very disappointed with this. Could you help me please?

closer look:

oops.
{}button) and similarly use backticks forinline code. – David Carlisle Apr 04 '13 at 13:08