documentclass{article}

usepackage[utf8]{inputenc}
usepackage[T1]{fontenc}
usepackage{fancyhdr}
usepackage[spanish]{babel}

newcommandopstyle{bfseriescolor{red}}
makeatletter
usepackage{xcolor,textcomp}
usepackage{enumitem}

usepackage{textcomp}
usepackage{listings}
usepackage{accsupp}
usepackage{lmodern}

definecolor{backcolour}{rgb}{0.95,0.95,0.92}

lstset { %
    language=C++,
    alsoletter=0123456789,
    upquote=true,
    columns=fullflexible,
    keepspaces=true,
    backgroundcolor=color{backcolour},
  breakatwhitespace=false,
  breaklines=true,
  captionpos=b,
  keepspaces=true,
  showspaces=false,
  showstringspaces=false,
  showtabs=false,
  tabsize=2
}

lst@AddToHook{OutputOther}{ProcessOther@silmeth}

newcommandProcessOther@silmeth
{%
  ifnumlst@mode=lst@Pmode%     % If we're in `Processing' mode...
    deflst@thestyle{opstyle}%  % ... redefine the style locally
  fi%
}

makeatother

%========================== Taken from https://tex.stackexchange.com/a/442600/152550
newcommand{noncopynumber}[1]{%
    BeginAccSupp{method=escape,ActualText={}}%
    #1%
    EndAccSupp{}%
}

makeatletter   %================= Taken from https://tex.stackexchange.com/a/19978/152550
deflst@outputspace{{ifxlst@bkgcoloremptycolor{white}elselst@bkgcolorfilst@visiblespace}}
makeatother


begin{document}

begin{lstlisting}
Example with no tabulation

    With one tabulation

 With one space
end{lstlisting}

end{document}