How to change the margin of code's frame of showexpl.sty when numbers=none?

Question

I want to align the code's frame with the formated text's frame.

If the numbers=left,the mission is accomplished by configuring xleftmargin, xrightmargin, framesep, and numbersep.

However, when I set numbers=none, I cannot accomplish my mission by configuring those properties. Regardless of the values set to those properties, the code's frame remains unchanged and expands beyond the \textwidth.

My Latex code is:

\documentclass[a4paper,11pt,twoside,final,dvips]{book}
\usepackage{xcolor}

\usepackage{showexpl}
\lstset{%
 breaklines=true,
  breakindent=0pt,
 basicstyle=\color{magenta}\ttfamily\tiny, 
 keywordstyle=\color{blue}\sffamily\bfseries,        
 identifierstyle=\color{black},          
 commentstyle=\color{cyan}\itshape,         
 stringstyle=\rmfamily,
 showstringspaces=false, 
 tabsize=2,
 %========== FRAME ========== 
 frame=single, 
 framerule=0.4pt, 
 rulecolor=\color{red},
 framesep=3pt, 
 %========== MARGIN ========== 
 xleftmargin=3.4pt, 
 xrightmargin=3.4pt,
 %========== NUMBER ========== 
 numbers=left,
 numberstyle=\color{red}\tiny,
 numbersep=6.4pt,
 explpreset={language={[LaTeX]TeX},pos=b}%
}

\usepackage{lipsum}

\usepackage{printlen}
%------------------------- MARKER ------------------------ 
\newlength{\halftextwidth} 
\setlength{\halftextwidth}{\textwidth*\real{0.5}}
\newcommand*{\MARKER}%
{%
 \uselengthunit{cm} 
 \par\noindent\strut\vrule%
 \hrulefill~%
  {\color{red}\scriptsize half text area: \printlength{\halftextwidth}}%
 ~\hrulefill\vrule%
 \hrulefill~%
  {\color{red}\scriptsize half text area: \printlength{\halftextwidth}}%
 ~\hrulefill\vrule%
 \marginpar%
 {%
  \strut\vrule\hrulefill~%
   {\color{red}\scriptsize margin area: \rndprintlength{\marginparwidth}}%
  ~\hrulefill\vrule%
 }%
\par%
}%


\begin{document}

\chapter{I love \LaTeXe, but $\cdots$}


\section{With numbers=left}
\vfill
\MARKER
\begin{LTXexample}
\lipsum[1-1]
\end{LTXexample}
\MARKER
\vfill
\pagebreak


\section{With numbers=none}
\vfill
\MARKER
% Any values that are assigned to xleftmargin or xrightmargin 
% have no effect on the margin of the code's frame.
\begin{LTXexample}[numbers=none,xleftmargin=10.4pt,xrightmargin=10.4pt]
\lipsum[1-1]
\end{LTXexample}
\MARKER
\vfill
\end{document}

Answer 1

Here's a hack that might work:

numberstyle=\color{white}\tiny,

I'm not proud of it but it's the first workaround that occurred to me.