Reset Tikz Style

Question

When I use the \CircleText macro within a \node in which the text width= is specified, the text width= gets applied to \CircleText. Is there a way to reset the style so that \CircleText does not inhert the text width= style. The MWE below produces:

I think, if at the start of the options to \CircleText, I could somehow reset all style to their default setting, this would work fine.

Notes:

• One solution would be to set the text width= to something appropriate within \CircleText but all that does is deffer this problem until there is some other style that I do not want to be inherited.
• Another solution would be to create boxes for each numnber and then use \usebox as suggested at Proper nesting of tikzpicture environments: Reset all PGF values to their defaults.
• It has been pointed out in the comments that this is a case of a nested tikxpicture which is not officially supported and could break at any time. This can easily be remedied with the solution provided at Is there a (simple) way to find out if a command is executed in a tikzpicture environment?. However, this then requires the use of a \node within a \node which does not even compile.

Code:

\documentclass{article}
\usepackage{tikz}

%% https://tex.stackexchange.com/questions/15334/getting-numbers-to-appear-in-circles
\newcommand*{\CircledText}[2][fill=red!40]{%
    \tikz[baseline=(char.base)]{%
        \node[
            shape=circle,
            draw=black, thick, 
            fill opacity=0.3,
            text opacity=1,
            inner sep=0.8pt,
            outer sep=0pt,
            #1
        ] (char) {#2};}%
}%

\newcommand*{\DesiredText}{\CircledText{3} Some text}


\begin{document}
Outside of tikzpicture: \DesiredText

\bigskip
Inside of tikzpicture \emph{without} ``text width='' specified):

\begin{tikzpicture}
    \node at (4,0) {\DesiredText};
\end{tikzpicture}

\bigskip
Inside of tikzpicture \emph{with} ``text width='' specified):

\begin{tikzpicture}
    \node [text width=5.0cm] at (4,0) {\DesiredText};
\end{tikzpicture}
\end{document}

Answer 1

You can protect the paramater you want to preserve :

\documentclass{article}
\usepackage{tikz}

\newbox\mybox

%% https://tex.stackexchange.com/questions/15334/getting-numbers-to-appear-in-circles
\newcommand*{\CircledText}[2][fill=red!40]{%
    \setbox\mybox=\hbox{#2}
    \tikz[baseline=(char.base)]{%
        \node[
            shape=circle,
            draw=black, thick, 
            fill opacity=0.3,
            text opacity=1,
            inner sep=0.8pt,
            outer sep=0pt,
            #1,text width=\wd\mybox
        ] (char) {#2};}%
}%

\newcommand*{\DesiredText}{\CircledText{3} Some text}


\begin{document}
Outside of tikzpicture: \DesiredText

\bigskip
Inside of tikzpicture \emph{without} ``text width='' specified):

\begin{tikzpicture}
    \node at (4,0) {\DesiredText};
\end{tikzpicture}

\bigskip
Inside of tikzpicture \emph{with} ``text width='' specified):

\begin{tikzpicture}
    \node [text width=5.0cm] at (4,0) {\DesiredText};
\end{tikzpicture}
\end{document}