Ggtkuk

I am aware that similar questions have been asked a few times. However, none of the answers solved my problem. This Answer says that it is a bug in luaotfload. But I'm already using a newer version (2.80001).

I'm trying to supress ligatures via selnolig package. It works great, but not for text that was set in capitals. Using microtypes DisableLigatures or selnolig package breaklig also has no effect. See MWE:

% !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={scshapemdseriesLarge}

]{section}



RedeclareSectionCommand[%

    font={mdseriesLarge}

]{subsection}



begin{document}

% Heading set in caps => ligature still present

section{Berufliche Praxis}

Berufliche Praxispar

ff fl fi



% Using breaklig command => ligature still present

section{Berufbreaklig liche Praxis}



% Disabling selnolig => works as expected

selnoligoff

section{Berufliche Praxis}

selnoligon



% No caps => works as expected

subsection{Berufliche Praxis}



end{document}

So the selnolig package takes care that ligatures in Berufliche gets suppressed. This is correct. But it does not work for headings with small caps. Adding selnoligoff right before the section seems to be the only way to supress ligatures in headings with small caps? Or have I missed a setting? I'm wondering which package is responsible for this bug.

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, fkern0ptl.

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={scshapemdseriesLarge}

]{section}



RedeclareSectionCommand[%

    font={mdseriesLarge}

]{subsection}



makeatletter

usepackage{listofitems}

expandafterdefcsname{fl}ligendcsname{fkern0ptl}% fl

expandafterdefcsname{ff}ligendcsname{fkern0ptf}% ff

expandafterdefcsname{ }ligendcsname{hspace{11pt}}% INCREASE SPACE KERN

setsepchar{fl||ff|| }% CONCATENATE THE DESIRED LIGATURES WITH || "OR"

letsvsectionsection

renewcommandsection{@ifstar{starsection}{nostarsection}}

newcommandstarsection[1]{%

  tmptitle{#1}%

  svsection*{tmp}%

}

newcommandnostarsection[2][relax]{%

  tmptitle{#2}%

  ifrelax#1relaxsvsection[#2]{tmp}else%

    svsection[#1]{tmp}%

  fi%

}

newcommandtmptitle[1]{%

  readlistmyligs{#1}%

  deftmp{}%

    foreachitemxinmyligs{%

      expandafterg@addto@macroexpandaftertmpexpandafter{x}%

      ifnumxcnt<listlenmyligsrelax

        expandafterexpandafterexpandafterg@addto@macro

        expandafterexpandafterexpandaftertmp

        expandafterexpandafterexpandafter{%

        csname{myligssep[xcnt]}ligendcsname}%

      fi

    }%

}

makeatother

begin{document}

tableofcontents



hrulefill

section[blah Berufliche]{Berufliche Praxis}



section{Hoffähige Praxis}



subsection{Berufliche Praxis}

end{document}

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):

expandafterdefcsname{e}ligendcsname{kern3pttextcolor{red}{e}kern1pt}

setsepchar{fl||ff|| ||e}% CONCATENATE THE DESIRED LIGATURES WITH || "OR"

produces this result:

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={scshapemdseriesLarge}

]{section}



RedeclareSectionCommand[%

    font={mdseriesLarge}

]{subsection}



begin{document}



section{Berufliche Praxis}

Berufliche Praxispar

ff fl fi



end{document}