No completion for 'helplang' option

[heavenshell]

Steps to reproduce

1. Start Vim with set wildoptions+=pum

vim -Nu NONE -S <(cat <<EOF
set wildmenu
set wildoptions+=pum
set wildmode=longest:full,full
EOF

2. Type :h help-tags@<TAB>
3. Does not show candidates(In this case @en and @ru are candidates)

Expected behaviour

Show all language code candidates

Version of Vim

9.1.283

Environment

OS: Ubuntu 23.10
terminal: Teminal.app(SSH from macOS)
value of $TERM: tmux-256color
shell: GNU bash, version 5.2.15

Kapture.2024-04-12.1.45.48.mp4

Logs and stack traces

No response

[chrisbra]

I always though you would have to do :set helplang=en,ru in the first place?

So does it work without setting:

set wildmenu
set wildoptions+=pum
set wildmode=longest:full,full

? You can then just do :h help-tags@<CTRL-D and see what it suggests

[heavenshell]

Thank you for response!

:set helplang=en,ru in the first place?

No candidates...

2024-04-12.2.55.35.mov

$ vim -Nu NONE -S <(cat <<EOF
set helplang=en,ru
EOF
)
:h help-tags@<TAB>

[chrisbra]

and did you install a foreign help file?

[heavenshell]

and did you install a foreign help file?

Yes, add vimdoc-ja(Japanese translation project: https://github.com/vim-jp/vimdoc-ja)

$ vim -Nu NONE -S <(cat <<EOF
set helplang=en,ja
packadd vimdoc-ja
EOF
)

:h help@<CTRL-D>

Kapture.2024-04-12.11.23.35.mp4

[chrisbra]

Has this ever worked? Or is this a feature request?

[heavenshell]

Has this ever worked?

Maybe no. I just noticed that I can't complete @ja.
I don't know this behavior is by design or bug 😢