bug#62935: 29.0.90; icomplete-vertical-mode misses add-file-local-variable alternative

[Eli Zaretskii]

> Date: Tue, 18 Apr 2023 14:53:54 GMT
> From: Van Ly <van.ly@sdf.org>
> 
> The icomplete-vertical-mode does not list buffer-save-without-query as an 
> option to add-file-local-variable after the input prefix buffer- .
> 
> Steps to reproduce
>  - emacs -Q
>  - switch to buffer bbb, C-x b bbb RET
>  - enable completion mode, M-x icomplete-vertical-mode
>  - add file local variable, M-x add-file-local-variable abbreviated by
>    = M-x add-fi C-j
>    = buffer- [does not list completion buffer-save-without-query]
>    = alternatives listed are
>      - buffer-read-only
>      - buffer-offer-save
> 
> Expected behavior
>  - completion mode lists buffer-save-without-query
>    = example of desired completion listing
>      - buffer-read-only
>      - buffer-offer-save
>      - buffer-save-without-query
> 
> Unexpected behavior
>  - completion mode lists two alternatives without desired option
>    = observed completion listing
>      - buffer-read-only
>      - buffer-offer-save

add-file-local-variable completes only on variables that are safe as
local variables, and buffer-save-without-query is not.  So you need to
type its name completely.

This is not a bug.