Unable to supress ligatures in headings which are set in Caps

With a current luaotfload (version 2.96) you can disable the ligatures in the SmallCapsFeatures:

\documentclass[%
    a4paper,
    DIV=9,
    fontsize=14pt,
    parskip=half-
]{scrartcl}

\usepackage[ngerman]{babel}

\usepackage{fontspec}
\setmainfont{TeX Gyre Termes}[%
    Ligatures=Common,
    SmallCapsFeatures=
      {Letters=UppercaseSmallCaps,
       Ligatures=CommonOff}, %disable ligatures
]

\setkomafont{disposition}{\rmfamily}

\usepackage[tracking=true]{microtype}
\SetTracking{encoding=*,shape=sc}{160}

\RedeclareSectionCommand[%
    font={\scshape\mdseries\Large}
]{section}

\RedeclareSectionCommand[%
    font={\mdseries\Large}
]{subsection}

\begin{document}

\section{Berufliche Praxis}
Berufliche Praxis\par
ff fl fi

\end{document}

enter image description here


Here is an automated approach that reconditions the arguments of \section to look for specified ligatures, such as fl and to replace them with, for example, f\kern0ptl.

In the MWE, look for the lines between \makeatletter and \makeatother for the approach.

As an aside, I actually used the same method to also increase the default kern of the space character in small-caps section titles.

Shown for ligatures fl and ff. Can easily add more as needed.

EDITED to handle star sections/toc.

% !TeX program = lualatex
% !TeX encoding = UTF-8 Unicode
\documentclass[%
    a4paper,
    DIV=9,
    fontsize=14pt,
    parskip=half-
]{scrartcl}

\usepackage[ngerman]{babel}

\usepackage{fontspec}
\setmainfont{TeX Gyre Termes}[%
    Ligatures=Common,
    SmallCapsFeatures={Letters=UppercaseSmallCaps},
]

\setkomafont{disposition}{\rmfamily}

\usepackage[tracking=true]{microtype}
\SetTracking{encoding=*,shape=sc}{160}
\usepackage[ngerman]{selnolig}

\RedeclareSectionCommand[%
    font={\scshape\mdseries\Large}
]{section}

\RedeclareSectionCommand[%
    font={\mdseries\Large}
]{subsection}

\makeatletter
\usepackage{listofitems}
\expandafter\def\csname{fl}lig\endcsname{f\kern0ptl}% fl
\expandafter\def\csname{ff}lig\endcsname{f\kern0ptf}% ff
\expandafter\def\csname{ }lig\endcsname{\hspace{11pt}}% INCREASE SPACE KERN
\setsepchar{fl||ff|| }% CONCATENATE THE DESIRED LIGATURES WITH || "OR"
\let\svsection\section
\renewcommand\section{\@ifstar{\starsection}{\nostarsection}}
\newcommand\starsection[1]{%
  \tmptitle{#1}%
  \svsection*{\tmp}%
}
\newcommand\nostarsection[2][\relax]{%
  \tmptitle{#2}%
  \if\relax#1\relax\svsection[#2]{\tmp}\else%
    \svsection[#1]{\tmp}%
  \fi%
}
\newcommand\tmptitle[1]{%
  \readlist\myligs{#1}%
  \def\tmp{}%
    \foreachitem\x\in\myligs{%
      \expandafter\g@addto@macro\expandafter\tmp\expandafter{\x}%
      \ifnum\xcnt<\listlen\myligs[]\relax
        \expandafter\expandafter\expandafter\g@addto@macro
        \expandafter\expandafter\expandafter\tmp
        \expandafter\expandafter\expandafter{%
        \csname{\myligssep[\xcnt]}lig\endcsname}%
      \fi
    }%
}
\makeatother
\begin{document}
\tableofcontents

\hrulefill
\section[blah Berufliche]{Berufliche Praxis}

\section{Hoffähige Praxis}

\subsection{Berufliche Praxis}
\end{document}

enter image description here

Of course, I shouldn't mention the crazy stuff you can do with this approach. But I will. Adding these lines (and the xcolor package):

\expandafter\def\csname{e}lig\endcsname{\kern3pt\textcolor{red}{e}\kern1pt}
\setsepchar{fl||ff|| ||e}% CONCATENATE THE DESIRED LIGATURES WITH || "OR"

produces this result:

enter image description here

Tags:

Luatex

Fontspec

Microtype

Selnolig

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