My line won't break because of package contour

Question

I would really appreciate if someone could help me with this. I don't know how to prevent the second phrase from not breaking at the end of the line. Surely, I can break the phrase on my own (third phrase), but then it doesn't fit the whole width of the text and I have to make it fit manually. I need Latex to take care of that line break. Apparently, the reason is contour package, but I do need its very bold font.

EDIT: I simplified my code. Sorry about that.

\documentclass[10pt]{article}
\usepackage[usenames]{color}
\usepackage[outline]{contour}

\definecolor{MIR}{RGB}{187, 30, 16}

\contourlength{0.3pt}
\contournumber{20}

\newcommand{\MIR}[1]{\contour{MIR}{#1}}

\begin{document}

I only need some text width enough to prove my point, so I'll write some nonsenses.

\MIR{I only need some text width enough to prove my point, so I'll write some nonsenses.}

\MIR{I only need some text width enough to prove my point, so I'll write}\linebreak \MIR{some nonsenses.} 
\end{document}

Answer 1

You can't break lines in the scope of \contour. But you can split the words and apply \contour to each one.

\documentclass[10pt]{article}
\usepackage[usenames]{color}
\usepackage[outline]{contour}
\usepackage{xparse}

\definecolor{MIR}{RGB}{187, 30, 16}

\contourlength{0.3pt}
\contournumber{20}

\ExplSyntaxOn
\NewDocumentCommand{\MIR}{m}
 {
  \seq_set_split:Nnn \l_tmpa_seq { ~ } { #1 }
  \seq_map_inline:Nn \l_tmpa_seq { \contour{MIR}{##1} ~ } \unskip
 }
\ExplSyntaxOff

\begin{document}

I only need some text width enough to prove my point, so I'll write some nonsenses.

\MIR{I only need some text width enough to prove my point, so I'll write some nonsenses.}

\end{document}