Reduce row spacing in verbatim environment?

Question

In this example I would like a continuous display for box characters which is not yet the case:
documentclass{article}
usepackage{fontspec}
usepackage{dejavu}

setmonofont{DejaVu Sans Mono}

renewcommand{baselinestretch}{0.1}
begin{document}
begin{verbatim}
    ┞─┬─┬─┬─┬─┬─┬─┬─┦
    │0│1│0│1│0│0│1│1│
    └─┴─┴─┴─┴─┴─┴─┴─┘
end{verbatim}
end{document}

With the current code I get this:

In my text editor it's fine:

muzimuzhi Z · Accepted Answer

I think the row space is the minimum vertical spaces inserted between vboxes. It is controlled by lineskip and has initial value 1pt. In the following example I set lineskip to zero inside every verbatim environment and it seems  to work.
documentclass{article}
usepackage{etoolbox}
usepackage{fontspec}
usepackage{dejavu}

setmonofont{DejaVu Sans Mono}

AtBeginEnvironment{verbatim}{setlength{lineskip}{0pt}}

begin{document}
begin{verbatim}
    ┞─┬─┬─┬─┬─┬─┬─┬─┦
    │0│1│0│1│0│0│1│1│
    └─┴─┴─┴─┴─┴─┴─┴─┘
end{verbatim}
end{document}

egreg · Answer

As muzimuzhi Z says, the problem is lineskip, whose default value is 1pt. Since the lines would touch each other, TeX inserts lineskip glue.
However, there are other problems with your code: blank spaces are preserved at the beginning of lines, so your verbatim environment is indented.
In my opinion, one should never indent the contents of a verbatim environment. If an indent is wanted, it's better to use fancyvrb features; among them there is the possibility of gobbling initial spaces, but I don't recommend it.
You can also say fvsetup{formatcom=setlength{lineskip}{0pt}} in the preamble, if you want this setting to hold in every Verbatim environment (note the uppercase initial).
documentclass{article}
usepackage{fontspec}
usepackage{fancyvrb}

setmonofont{DejaVu Sans Mono}

begin{document}

begin{Verbatim}[formatcom=setlength{lineskip}{0pt}]
┞─┬─┬─┬─┬─┬─┬─┬─┦
│0│1│0│1│0│0│1│1│
└─┴─┴─┴─┴─┴─┴─┴─┘
end{Verbatim}

begin{Verbatim}[formatcom=setlength{lineskip}{0pt}]
    ┞─┬─┬─┬─┬─┬─┬─┬─┦
    │0│1│0│1│0│0│1│1│
    └─┴─┴─┴─┴─┴─┴─┴─┘
end{Verbatim}

begin{Verbatim}[formatcom=setlength{lineskip}{0pt},gobble=4]
    ┞─┬─┬─┬─┬─┬─┬─┬─┦
    │0│1│0│1│0│0│1│1│
    └─┴─┴─┴─┴─┴─┴─┴─┘
end{Verbatim}

begin{Verbatim}[formatcom=setlength{lineskip}{0pt},gobble=4,xleftmargin=parindent]
    ┞─┬─┬─┬─┬─┬─┬─┬─┦
    │0│1│0│1│0│0│1│1│
    └─┴─┴─┴─┴─┴─┴─┴─┘
end{Verbatim}

end{document}

Reduce row spacing in verbatim environment?

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