PDF+LaTeX incorrectly replaces \\ (two backslashes) by a newline

[Boris Dalstein]

I have an SVG file which contains text like such, the important part being the double backslash:

$\sboundary f =
\left[\begin{array}{c}
\gamma_1 = [ (e^\circ, \top) ] \\
\gamma_2 = [ (e^\circ, \top) ]
\end{array}\right]$

Using Inkscape 0.91 r13725, on Kubuntu 16.04 64bits, PDF+LaTeX converts the text to the following, that is, replaces the double backslashes by a newline!

    \put(0.50170692,0.32122315){\color[rgb]{0,0,0}\makebox(0,0)[b]{\smash{$\sboundary f =
  \left[\begin{array}{c}
  \gamma_1 = [ (e^\circ, \top) ]

  \gamma_2 = [ (e^\circ, \top) ]
  \end{array}\right]$}}}%

Which makes LaTeX crash with the error:

Runaway argument?
{$\sboundary f = \left [\begin {array}{c} \gamma _1 = [ (e^\circ , \top \ETC.
! Paragraph ended before \makesm@sh was complete.
<to be read again>
                   \par
l.64 \end{array}\right]$}}}
                             %

I do need the backslashes so that the array environment knows where the next row starts. It seems Inkscape is trying to be too smart. In a previous version of Inkscape (sorry, I don't know which), this text used to be correctly exported as the following:

    \put(0.50170692,0.32122315){\color[rgb]{0,0,0}\makebox(0,0)[b]{\smash{$\sboundary f =
\left[\begin{array}{c}
\gamma_1 = [ (e^\circ, \top) ] \\
\gamma_2 = [ (e^\circ, \top) ]
\end{array}\right]$}}}%

[Boris Dalstein (dalboris)]

PDF export

[Boris Dalstein (dalboris)]

pdf_tex export

[Boris Dalstein (dalboris)]

pdf_tex export from a previous Inkscape version (retrieve from my archives)

[Boris Dalstein (dalboris)]

Note: this SVG file also exhibits the following export error:

https://bugs.launchpad.net/ubuntu/+source/inkscape/+bug/1417470

I fixed it by using the following definition of \includesvg, inspired by one comment in the above bug:

\newcommand{\includesvg}[2][]{%
\executeiffilenewer{images/#2.svg}{images/#2.pdf}%
{\unexpanded{PDF_FILE="./images/#2.pdf"; inkscape -z --file=./images/#2.svg --export-pdf=$PDF_FILE --export-latex; sed -i 's/\\\\/\n/g' ${PDF_FILE}_tex; MAXPAGE=$(pdfinfo $PDF_FILE | grep -oP "(?<=Pages:)\s*[0-9]+" | tr -d " ") ; sed -i "/page=$(($MAXPAGE+1))/,\${/page=/d}" ${PDF_FILE}_tex; } }
\ifthenelse{\isempty{#1}}{\small}{#1}
\input{images/#2.pdf_tex}%
}