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Wrong alignment in parallel text with selectlanguage

TeX - LaTeX Asked by Tecti on December 17, 2020

An alignment problem occurs when I use Parallel Text together with selectlanguage: the righthand column starts one or two lines below the lefthand column.

Here is a minimum working example of the problem

documentclass[11pt,a4paper]{report}
usepackage[left=3cm, right=3cm, top=3cm, bottom=3cm, headheight=13.6pt]{geometry}
usepackage[utf8]{inputenc}
usepackage{gfsdidot}
usepackage[english, greek, french]{babel}
languageattribute{greek}{ancient}
usepackage{parallel}

begin{document}
selectlanguage{english}

begin{Parallel}{0.52textwidth}{0.43textwidth}

 ParallelLText{ 
A textit{deduction}, then, is a discourse in which,
certain things having been supposed, something different from the things supposed results of necessity through them. 
}
ParallelRText{raggedright
selectlanguage{greek}
 Ἔστι δὴ συλλογισμὸς λόγος ἐν ᾧ τεθέντων τινῶν ἕτερόν τι τῶν κειμένων ἐξ ἀνάγκης συμβαίνει διὰ τῶν κειμένων. }
   renewcommand{ParallelAtEnd}{ selectlanguage{english} begin{flushright} textit{Top.} I 1, 100a25--b23; transl. Smith modified end{flushright}}
end{Parallel}
end{document}

The pdf output, with the alignment problem

If I take the selectlanguage out, and replacing the Greek by English, it is fine.

documentclass[11pt,a4paper]{report}
usepackage[left=3cm, right=3cm, top=3cm, bottom=3cm, headheight=13.6pt]{geometry}
usepackage[utf8]{inputenc}
usepackage{gfsdidot}
usepackage[english, greek, french]{babel}
languageattribute{greek}{ancient}
usepackage{parallel}

begin{document}
selectlanguage{english}

begin{Parallel}{0.52textwidth}{0.43textwidth}

 ParallelLText{ 
A textit{deduction}, then, is a discourse in which,
certain things having been supposed, something different from the things supposed results of necessity through them. 
}
ParallelRText{raggedright
A textit{deduction}, then, is a discourse in which,
certain things having been supposed, something different from the things supposed results of necessity through them. 
 }
   renewcommand{ParallelAtEnd}{ selectlanguage{english} begin{flushright} textit{Top.} I 1, 100a25--b23; transl. Smith modified end{flushright}}
end{Parallel}
end{document}

The pdf output, without the alignment problem and without selectlanguage

Note: The aligment problem is not due to the use of Greek, since I have the same problem using selectlanguage{english} and the English text.

  ParallelRText{raggedrightselectlanguage{english} A
    textit{deduction}, then, is a discourse in which, certain things
    having been supposed, something different from the things supposed
     results of necessity through them.   
    }

The pdf output, with the alignment problem and selectlanguage{english}

Does anybody knows what is going on and how to fix this?
Many thanks.

2 Answers

The problem is selectlanguage{greek} that adds a blank line. Use begin{otherlanguage*}{greek}...end{otherlanguage*} instead.

I propose a simpler interface:

documentclass[11pt,a4paper]{report}
usepackage[left=3cm, right=3cm, top=3cm, bottom=3cm, headheight=13.6pt]{geometry}
usepackage[T1]{fontenc}
usepackage{gfsdidot}
usepackage[main=english, greek, french]{babel}
languageattribute{greek}{ancient}
usepackage{parallel}
%usepackage{xparse} % not needed with LaTeX 2020-10-01 or later

NewDocumentEnvironment{xParallel}{mmo}
 {%
  IfValueT{#3}{%
    renewcommand{ParallelAtEnd}{begin{flushright}#3end{flushright}}%
  }%
  Parallel{#1}{#2}%
 }
 {endParallel}

NewDocumentCommand{ParallelText}{mom}{%
  csname Parallel#1Textendcsname{%
    IfValueT{#2}{begin{otherlanguage*}{#2}}%
    #3par
    IfValueT{#2}{end{otherlanguage*}}%
  }%
}

begin{document}

begin{xParallel}{0.52textwidth}{0.43textwidth}[
  textit{Top.} I 1, 100a25--b23; transl. Smith modified
]
ParallelText{L}{
  A textit{deduction}, then, is a discourse in which,
  certain things having been supposed, something different
  from the things supposed results of necessity through them. 
}
ParallelText{R}[greek]{raggedright
   Ἔστι δὴ συλλογισμὸς λόγος ἐν ᾧ τεθέντων τινῶν ἕτερόν τι τῶν 
  κειμένων ἐξ ἀνάγκης συμβαίνει διὰ τῶν κειμένων.
}
end{xParallel}

end{document}

The xParallel environment has a trailing optional argument for setting the final text. The ParallelText command has a mandatory argument for the side (L or R) and also an optional argument for the language.

enter image description here

The advantage is that it's possible to fine tune the spacings. For instance, you may want to do

documentclass[11pt,a4paper]{report}
usepackage[left=3cm, right=3cm, top=3cm, bottom=3cm, headheight=13.6pt]{geometry}
usepackage[T1]{fontenc}
usepackage{gfsdidot}
usepackage[main=english, greek, french]{babel}
languageattribute{greek}{ancient}
usepackage{parallel}
%usepackage{xparse} % not needed with LaTeX 2020-10-01 or later

usepackage{lipsum}

NewDocumentEnvironment{xParallel}{mmo}
 {%
  paraddvspace{topsep}
  IfValueT{#3}{%
    renewcommand{ParallelAtEnd}{parnobreakvspace{topsep}{raggedleft#3par}}%
  }%
  Parallel{#1}{#2}%
 }
 {endParallelparaddvspace{topsep}}

NewDocumentCommand{ParallelText}{mom}{%
  csname Parallel#1Textendcsname{%
    IfValueT{#2}{begin{otherlanguage*}{#2}}%
    #3par
    IfValueT{#2}{end{otherlanguage*}}%
  }%
}

begin{document}

lipsum[1][1-3]

begin{xParallel}{0.52textwidth}{0.43textwidth}[
  textit{Top.} I 1, 100a25--b23; transl. Smith modified
]
ParallelText{L}{
  A textit{deduction}, then, is a discourse in which,
  certain things having been supposed, something different
  from the things supposed results of necessity through them. 
}
ParallelText{R}[greek]{raggedright
   Ἔστι δὴ συλλογισμὸς λόγος ἐν ᾧ τεθέντων τινῶν ἕτερόν τι τῶν 
  κειμένων ἐξ ἀνάγκης συμβαίνει διὰ τῶν κειμένων.
}
end{xParallel}

lipsum[1][1-3]

end{document}

enter image description here

Correct answer by egreg on December 17, 2020

I have found a workaround to the problem:

add selectlanguage to every parallel section.

documentclass[11pt,a4paper]{report}
usepackage[left=3cm, right=3cm, top=3cm, bottom=3cm, headheight=13.6pt]{geometry}
usepackage[utf8]{inputenc}
usepackage{gfsdidot}
usepackage[english, greek, french]{babel}
languageattribute{greek}{ancient}
usepackage{parallel}

begin{document}
selectlanguage{english}

begin{Parallel}{0.52textwidth}{0.43textwidth}

 ParallelLText{ selectlanguage{english}
A textit{deduction}, then, is a discourse in which,
certain things having been supposed, something different from the things supposed results of necessity through them. 
}
ParallelRText{raggedright
selectlanguage{greek}
 Ἔστι δὴ συλλογισμὸς λόγος ἐν ᾧ τεθέντων τινῶν ἕτερόν τι τῶν κειμένων ἐξ ἀνάγκης συμβαίνει διὰ τῶν κειμένων. }
   renewcommand{ParallelAtEnd}{ selectlanguage{english} begin{flushright} textit{Top.} I 1, 100a25--b23; transl. Smith modified end{flushright}}
end{Parallel}
end{document}

Parallel text without the alignment problem

If someone can tell me the reason selectlanguage produces this problem, I would gladly hear it. This solution also has the problem of increasing the vertical space above the Parallel text, but that is a lesser problem and can be adjusted by vspace{-10pt} if necessary.

Answered by Tecti on December 17, 2020

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