#429 \pgfkeyscurrentkey is not updated on assigning a new value to a .code subkey

[Evan Aad]

If the handler config is set to only existing, trying to assign a new value to a .code subkey leaves the \pgfkeyscurrentkey macro empty.

Minimal example:

\documentclass{article}
\usepackage{pgfkeys}
\begin{document}
    \pgfkeys{/handler config=only existing}
    \pgfkeys{/handlers/.unknown/.code='\pgfkeyscurrentkey'}
    \pgfkeys{/root/subdir/.code=hello}
\end{document}

Output:

''

Expected output:

'/root/subdir/.code'

[Stefan Pinnow]

See https://github.com/pgf-tikz/pgf/issues/428