[BUG] completion is mess when _describe use alternative array

[HIDE-r]

Describe the bug

A clear and concise description of what the bug is.

I can make sure:

• I am using the latest version of fzf-tab
• this is the minimal zshrc which can reproduce this bug
• fzf-tab is loaded after compinit
• fzf-tab is loaded after plugins which will wrap Tab, like junegunn/fzf/completion.zsh
• fzf-tab is loaded before zsh-autosuggestions, zsh-syntax-highlighting and fast-syntax-highlighting.

To Reproduce

Steps to reproduce the behavior:

1. Type 'cmd '
2. Press Tab
3. See error

Lenovo-R9000K% cat $HOME/test_zshrc
fpath=($HOME/.fpath $fpath)

autoload -U compinit; compinit
source ~/somewhere/fzf-tab.plugin.zsh

Lenovo-R9000K% cat $HOME/.fpath/_cmd
#compdef cmd

local -a subcmds topics
subcmds=('c:description for c command' 'd:description for d command')
# topics=('e:description for e help topic' 'f:description for f help topic')
topics=('c:description for c command' 'd:description for d command')
_describe 'command' subcmds topics

❯ git clone https://github.com/Aloxaf/fzf-tab ~/somewhere
❯ zsh -d -f
Lenovo-R9000K% source test_zshrc
Lenovo-R9000K% cmd c:description\ for\ c\ command 

Expected behavior

There should be no extra characters('description\ for\ c\ command')

Screenshots

If applicable, add screenshots to help explain your problem.

Environment:

• OS: Arch Linux
• zsh version: 5.9 (x86_64-pc-linux-gnu)

Minimal zshrc

Lenovo-R9000K% cat $HOME/test_zshrc
fpath=($HOME/.fpath $fpath)

autoload -U compinit; compinit
source ~/somewhere/fzf-tab.plugin.zsh

Log

zsh-48936-fzf-tab-1.log

[Aloxaf]

This bug can be reproduced without fzf-tab:

> autoload -U compinit; compinit
_tst() {
    local -a subcmds topics
    subcmds=('c:description for c command' 'd:description for d command')
    topics=('c:description for c command' 'd:description for d command')
    _describe 'command' subcmds topics
}
compdef _tst tst
zstyle ':completion:*' menu yes select search
zstyle ':completion:*' list-grouped false

> tst # press tab here

Quite strange, it may be a bug of _describe or compsys.

[HIDE-r]

Maybe. It looks strange. What should I do about this issue next? report to zsh?

[Aloxaf]

I am not sure, this seems to be a known issue:

https://github.com/zsh-users/zsh/blob/master/Completion/Base/Utility/_describe#L3-L8

[Aloxaf]

Temporary workaround for anyone encountering this problem:

zstyle ':completion:*:complete:networkctl:*' list-grouped true