Aliases no longer produces correct completion

[chitoku-k]

OS version

N/A

zsh version

zsh 5.9 (x86_64-pc-linux-gnu)

awk version

N/A

jq version

N/A

fzf version

0.57.0 (0476a65f)

Command version(s)

N/A

Locale

N/A

Aliases (if applicable)

g='git'

Options

autocd
autopushd
autoresume
combiningchars
correct
extendedglob
noflowcontrol
histignorealldups
histignoredups
ignoreeof
interactive
login
magicequalsubst
monitor
nonomatch
pushdignoredups
shinstdin
zle

Installed zsh plugins (if applicable)

N/A

What happened?

When a command is aliased, its alias form no longer produces the correct completion.

Related: #251

$cmd_word is an aliased command (i.e., g) while the $arguments hold the original input (g checkout) as is.

fzf-zsh-completions/src/core/parser.zsh

Lines 3 to 8 in 4093db4

	_fzf_complete_get_command_pos() {
	local arguments=("${(Q)${(z)@}[@]}")
	local cmd=${cmd_word-$(__fzf_extract_command "$@")}
	echo ${arguments[(i)$cmd]}
	}

What did you expect to happen?

Completions for aliases should function again.

Steps to reproduce

$ g checkout **<TAB>