qpdf or bashcompinit completion bug

[Vincent Lefevre <vincent@xxxxxxxxxx>]

I've just reported

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1111509

about an issue with qpdf zsh completion: it does not work on
the first [Tab]. Then there are no issues for the shell session.
I'm wondering whether this is a bug in the qpdf completion or
in bashcompinit, on which it is based.

/usr/share/zsh/vendor-completions/_qpdf just contains:

#compdef qpdf
eval $(/usr/bin/qpdf --completion-zsh)

and "/usr/bin/qpdf --completion-zsh" just outputs:

autoload -U +X bashcompinit && bashcompinit && complete -o bashdefault -o default -C "/usr/bin/qpdf" qpdf

The zshcompsys(1) man page says

       The function bashcompinit provides compatibility with bash's
       programmable completion system.  When run it will define the
       functions, compgen and complete which correspond to the bash
       builtins with the same names.  It will then be  possible  to
       use  completion  specifications  and  functions  written for
       bash.

It seems that the first [Tab] sets up the completion for qpdf, but
does not attempt to complete, while it should do both.

I'm using zsh 5.9 under Debian/unstable.

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Vincent Lefèvre <vincent@xxxxxxxxxx> - Web: <https://www.vinc17.net/>
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