How should I prevent a .pic definition inside a document environment, but outside a tikzpicture, from adding a space to the typeset output?

This is how .pic is defined in tikz.code.tex line 4636-4640

\pgfkeysdef{/handlers/.pic}{%
  \edef\pgf@temp{\pgfkeyscurrentpath}%
  \edef\pgf@temp{\expandafter\tikz@smuggle@pics@in\pgf@temp\pgf@stop}%
  \expandafter\pgfkeys\expandafter{\pgf@temp/.style={code={#1}}}
}

The author missed a % at the end of line 4639.

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I reported it as a bug here: https://sourceforge.net/p/pgf/bugs/426/.