Mrthfx

Consider the following test code:

% ---------------------------------------------------------------------------- %

% File

begin{filecontents*}{jobname.cpp}

0000

0000

end{filecontents*}

begin{filecontents*}{multijobname.cpp}

0000

0000

0000

0000

end{filecontents*}

% ---------------------------------------------------------------------------- %

% Preamble

documentclass[letterpaper, 12pt, onecolumn]{article}

% ---------------------------------------------------------------------------- %

% Packages

usepackage{xcolor}

usepackage{listings}

usepackage{multicol}

usepackage[most]{tcolorbox}

% ---------------------------------------------------------------------------- %

% Listings options

definecolor{grey}{RGB}{224, 224, 224}

newtcbinputlisting{inputcode}[4][normalsize]{

    code = {},

    enhanced,

    listing only,

    top = 0pt,

    bottom = 0pt,

    left = 0pt,

    right = 0pt,

    arc = 0pt,

    outer arc = 0pt,

    boxsep = 0pt,

    titlerule = 0pt,

    colback = grey,

    colframe = black,

    boxrule = 2pt,

    title = {centering{fontfamily{cmtt}selectfont#2strut}},

    listing options = {

        language = C++,

        framesep = 0pt,

        rulesep = 0pt,

        aboveskip = 0pt,

        belowskip = 0pt,

        basicstyle = fontfamily{cmtt}selectfont#1,

        #3,

    },

    listing file={#4},

}

% ---------------------------------------------------------------------------- %

% Commands

newcommand{alphabet}{%

    small{ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz}%

}

newcommand{makelisting}[2]{%

    newpage%

    noindentalphabet%

    inputcode[#1]{#2}{}{jobname.cpp}%

    noindentalphabet%

    inputcode[#1]{#2}{multicols = 2}{multijobname.cpp}%

    noindentalphabet%

}

% ---------------------------------------------------------------------------- %

% Document

begin{document}

makelisting{tiny}{tiny}

makelisting{scriptsize}{scriptsize}

makelisting{footnotesize}{footnotesize}

makelisting{small}{small}

makelisting{normalsize}{normalsize}

makelisting{large}{large}

makelisting{Large}{Large}

makelisting{LARGE}{LARGE}

makelisting{huge}{huge}

makelisting{Huge}{Huge}

end{document}

% ---------------------------------------------------------------------------- %

It produces pairs of listings in tcolorboxes: one without multicolumn and the other with multicolumn. Examples of the output:

On these images:

• the distance between the top of the listing and the top of the first line corresponds to the red arrows


• the distance between the bottom of the listing and the bottom of the last line corresponds to the blue arrows

As show, the multicols option changes these distances. The change seems affected by the size of the font in the listing (as well as the size of normalsize specified in the document class).

How to correct the vertical spacing so that the spacing of the multicols version corresponds to the spacing without the multicols? (in a generic manner that would work for all font sizes)