[pstricks] spurious space from \pstVerb{}

[Alexander Grahn]

Good afternoon,

If used in a `pspicture' environment, \pstVerb{...} alters the
width of the resulting box.

A recent PSTricks update must have introduced this, as it does not happen
with frozen TeXLive-2017.

Alexander
--

Test file:

\documentclass{article}
\usepackage{pstricks}

\newsavebox\myBox

\begin{document}

\sbox\myBox{%
  \begin{pspicture}(0,0)(10,10)
  \end{pspicture}%
}%
\the\wd\myBox % 284.52744pt

\sbox\myBox{%
  \begin{pspicture}(0,0)(10,10)
    \pstVerb{/MyVar {} def}
  \end{pspicture}%
}%
\the\wd\myBox % 287.86076pt

\end{document}