I'm sorry I thought it came with zsh, but it turned out that I got it from
a zsh-users message. The code is

_insert_all_matches () {
    setopt localoptions nullglob rcexpandparam extendedglob noshglob
    unsetopt markdirs globsubst shwordsplit nounset ksharrays
    compstate[insert]=all
    compstate[old_list]=keep
    _complete
}
zle -C insert-all-matches complete-word _insert_all_matches

This code has worked for me for a few years until today I noticed that it
didn't work well with ls.

Mikael Magnusson <mikachu@gmail.com> 于 2020年9月29日周二 00:30写道：

> On 9/28/20, lilydjwg <lilydjwg@gmail.com> wrote:
> > bindkey '^Xi' insert-all-matches
> >
> > And then type:
> >
> > ls ^Xi
> >
> > There is an error message:
> >
> > _pick_variant:19: bad math expression: operand expected at `|| 0 ) '
> >
> > I'm using zsh 5.8 on Arch Linux.
>
> You should either complain to the person who wrote insert-all-matches,
> or provide the code here, otherwise nobody has any chance to guess
> what's wrong.
>
> --
> Mikael Magnusson
>