[BUG]Filename autocompletion using git-bare repos (--git-dir=... --work-tree=...)

[eliasghafari <eliasghafari@disroot.org>]

Hello,

I'm using a git bare repo to manage my files with this alias: "alias config='git --git-dir=$HOME/.local/share/dotfiles --work-tree=$HOME'",
completion for the commands works perfectly, e.g:
config ad<tab>
config add

config rm --ca<tab>
config rm --cached

But when it comes to filenames the autocompletion e.g:
in a normal git repo:
git rm --cached <tab> will show all the files that could be removed from
the index. And
git add <tab> will show all the files that were modified or created.

While using git bare repo:
config rm --cached <tab> doesn't show anything.
config add <tab> also shows nothing

So after investigating a bit, I found that the problem lied in the
expansion of the address of the git-dir and I found that by modifying
this line:
(( $+opt_args[--git-dir] )) && local -x GIT_DIR=${(Q)${~opt_args[--git-dir]}} && printf("\n${(Q)${~opt_args[--git-dir]}}\n")
which shows that the address passed to GIT_DIR is "$HOME/.local/share/dotfiles" without the "$HOME" being expanded to "/home/user".

I fixed this by replacing the Q modifier with e, but please note that I
have no idea how the zsh completion system works and I fixed this by
simply trying every modifier and seeing which one works.

After making that replacement,
config rm --cached <tab> shows what can be removed from the index, and
config add <tab> works too.