biblatex, style verbose-ibid, comment obtenir la date de première publication (origdate) ?

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\documentclass{article}
\usepackage[backend=biber,
        style=verbose-ibid,
        citetracker=context, 
        dateabbrev=false,
        doi=false,
        isbn=false,
        url=false,
        autopunct=false]{biblatex}
\renewbibmacro*{date}{%
  \iffieldundef{origyear}{%
  }{%
    \printtext[brackets]{%
      \printorigdate%
    }%
    \setunit{\addspace}%
  }%
  \printdate%
}
\begin{filecontents*}[overwrite]{\jobname.bib}
@book{test,
  author  = {Walter Ordsmith},
  title   = {An Old Work},
  date    = {2010},
  edition = {5},
  origdate = {1981},
}
@book{foo,
  author  = {Walter Ordsmith},
  title   = {An Old Work},
  date    = {2010},
  edition = {5},
}
\end{filecontents*}
\addbibresource{\jobname.bib}
 
 
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