Extra space when using (re)newcommand

Question

I have examined this question, where the OP wanted to discard the effect of \color when it is used inside an other \textcolor. @Rmano was faster than me and answered the question with the same way that I wanted.

However, "our" solution has a little problem about an extra whitespace:

I have tried to fix it many ways like \relax, \gobble, \xspace \ignorespaces, but I was shooting randomly and couldn't find the solution. Do you have any ideas?

\documentclass{article}
\usepackage{color}
\newcommand{\Textcolor}[2]{%
\textcolor{#1}{\renewcommand{\color}[1]{}#2}%
}%
\begin{document}
Some text
Some {\color{blue} text}
Some \textcolor{blue}{text}
\textcolor{red}{Some {\color{blue} text}}
\Textcolor{red}{Some {\color{blue} text}} %should produce the same
\Textcolor{red}{Some {\color{blue}text}} %should produce the same
\textcolor{red}{Some {\color{blue} text}}
\end{document}

Related question, spacing - Extra space added after equation when it is coloured - TeX - LaTeX Stack Exchange — user202729, May 27 '22 at 15:44

score 3 · Accepted Answer · answered Dec 01 '20 at 09:36

The standard working of \color ends with \ignorespaces.

\documentclass{article}
\usepackage{color}
\newcommand{\Textcolor}[2]{%
  \textcolor{#1}{\renewcommand{\color}[1]{\ignorespaces}#2}%
}
\begin{document}
Some text
Some {\color{blue} text}
Some \textcolor{blue}{text}
\textcolor{red}{Some {\color{blue} text}}
\Textcolor{red}{Some {\color{blue} text}} %should produce the same
\Textcolor{red}{Some {\color{blue}text}} %should produce the same
\textcolor{red}{Some {\color{blue} text}}
\end{document}

It should actually be

\renewcommand{\color}[2][]{\ignorespaces}

to cope with cases such as \color[rgb]{0.1,1,0.3}.

Thanks, it works :) You should leave a comment at the original question https://tex.stackexchange.com/a/573099/100231 I don't want to take your merits. — Tom Solid, Dec 01 '20 at 09:45

Extra space when using (re)newcommand

1 Answers1