Kdtyjb

While experimenting with two sided settings in scrlttr2 while using quoting in combination with tcolorbox, I came across an oddity. The following example shows interline spacing in text outside the quoting environment boxes. This only shows up in two sided mode, and only with beforeafter skip=baselineskip in the tcolorboxenvironment invocation that redefines quoting. I'm puzzled what's causing this, since it's not obviously connected to anything about the quoting environment, or two sidedness.

%documentclass[12pt, sections, headheight=30pt, headinclude, 

%firstfoot=false, enlargefirstpage=true, 

%foldmarks=false,foldmarks=blmtP, fromalign=center, fromphone, 

%fromemail, version=last, backaddress=false, subject=titled 

%{scrlttr2}



documentclass[12pt, sections, headheight=30pt, headinclude, 

firstfoot=false, enlargefirstpage=true, 

foldmarks=false,foldmarks=blmtP, fromalign=center, fromphone, 

fromemail, version=last, backaddress=false, subject=titled, twoside] 

{scrlttr2}



usepackage[most]{tcolorbox}

usepackage{quoting}

usepackage[T1]{fontenc}

usepackage{fouriernc}

tcolorboxenvironment{quoting}{beforeafter skip=baselineskip, boxrule=2pt, sharp corners, breakable, skin=enhanced, colback=white}

%tcolorboxenvironment{quoting}{boxrule=2pt, sharp corners, breakable, skin=enhanced, colback=white}



ExplSyntaxOn

NewDocumentCommand{dummy}{m m m}

{

  prg_replicate:nn { #3 }

  {

    prg_replicate:nn { #2 } { #1 hfill } dummy_endline:

  }

}

cs_new:Npn dummy_endline:

{ { parfillskip=0ptpar } }



ExplSyntaxOff



begin{document}

setkomavar{fromname}{Name}

setkomavar{fromaddress}{Address}

renewcommand{phonename}{Landline}

renewcommand{mobilephonename}{Mobile}

setkomavar{frommobilephone}{Mobile}

setkomavar{fromemail}{Email}

setkomavar{signature}{(usekomavar{fromname})}

setkomavar{subject}{Subject}

setkomavar{date}{today}



setkomavar{firsthead}{%

  parbox{linewidth}{centering

    textbf{jobname.tex} input{"| hg log -v -l 1 jobname.tex --template '{node}  {date|isodate}'"}

    ifhmode \ fi

    {fontfamily{pzc}selectfont

      hspace{textwidth}

      usekomavar{fromname}\

      usekomavar{fromaddress}\

      usekomavar*{mobilephoneseparator}usekomavar{mobilephoneseparator}usekomavar{frommobilephone}\

      usekomavar*{emailseparator}usekomavar{emailseparator}usekomavar{fromemail}

    }

  }%

}



makeatletter

@addtoplength{firstheadvpos}{30pt}

@addtoplength{toaddrvpos}{40pt}

@addtoplength{refvpos}{10pt}

@addtoplength{sigbeforevskip}{20pt}

makeatletter@setplength{sigindent}{0.5linewidth}makeatother

makeatother



deftoday{20th February, 2019}

begin{letter}{

    Someone\

    Company\

    Building\

    Street\

    City

  }



  opening{Hi}



  dummy{HelloWorld!}{3}{5}

  begin{quoting}

    dummy{AlohaWorld!}{3}{3}

  end{quoting}



  dummy{BonjourWorld!}{3}{3}



  begin{quoting}

    begin{tabular}{p{4.5in}r}

      textbf{dummy{CiaoWorld!}{3}{1}  }  & \

      dummy{CiaoWorld!}{3}{2}             & dummy{CiaoWorld!}{1}{1}

    end{tabular}

  end{quoting}



  closing{Yours Sincerely,}



end{letter}

end{document}

ADDENDUM: A hopefully simplified version which looks more like what I'm actually seeing.

documentclass[12pt,sections,headheight=30pt,headinclude,firstfoot=false,enlargefirstpage=true,foldmarks=false,foldmarks=blmtP,fromalign=center,,version=last, backaddress=false, subject=titled, twoside=semi]{scrlttr2}



%documentclass[12pt,sections,headheight=30pt,headinclude,firstfoot=false,enlargefirstpage=true,foldmarks=false,foldmarks=blmtP,fromalign=center,version=last, backaddress=false, subject=titled]{scrlttr2}

usepackage{quoting}

usepackage[most]{tcolorbox}

usepackage[T1]{fontenc}

usepackage{fouriernc}



tcolorboxenvironment{quoting}{beforeafter skip=baselineskip, boxrule=2pt,sharp corners,breakable,skin=enhanced,colback=white}



%tcolorboxenvironment{quoting}{boxrule=2pt,sharp corners,breakable,skin=enhanced,colback=white}



begin{document}

%setkomavar{subject}{Subject Subject Subject Subject Subject Subject Subject Subject Subject Subject Subject  }

setkomavar{subject}{Subject}



makeatletter

@addtoplength{firstheadvpos}{30pt}

@addtoplength{toaddrvpos}{40pt}

@addtoplength{refvpos}{10pt}

@addtoplength{sigbeforevskip}{20pt}

makeatletter@setplength{sigindent}{0.5linewidth}makeatother

makeatother



begin{letter}{

    To Address

  }



  opening{Hi,}



  Line 1.\

  Line 2.\

  Line 3.\



  Line 1.\

  Line 2.\



  begin{quoting}

    Line 1\

    Line 2\

  end{quoting}

  Line 1\

  Line 2\

  begin{quoting}

    Line 1\

    Line 2\

  end{quoting}



closing{Yours Sincerely,}

end{letter}



end{document}

The first page of the resulting 2 page file is shown below, which displays the problem

When using twoside the class activates (like other classes often do) flushbottom. That means that LaTeX will try to fill the page, and for this stretches the parskip.

The effect disappears if you remove the beforeafter skip=baselineskip, as then the letter fits on one page.

In oneside mode you get the same if add flushbottom.

To avoid the problem add raggedbottom

Using flushbottom in twoside-mode was a bug in scrlttr2 since version 3.17. It has been fixed in scrlttr2 v3.27.3111 by adding raggedbottom to the definition of the letter environment. Before this change

documentclass[twoside]{scrlttr2}



usepackage{mwe}



begin{document}

begin{letter}{You\There}

  opening{Hi,}

  blindtextparblindtext



  noindentrule{textwidth}{.5textheight}



  blindtext

  closing{Bye}

end{letter}



end{document}

resulted in a warning message:

Underfull vbox (badness 10000) has occurred while output is active [1

and

With KOMA-Script 3.27.3111 (this is a KOMA-Script pre-release), it results in:

without warning message.

Note, there are additional changes in upcoming KOMA-Script 3.27 (linked page in German).