GNU bug report logs - #77718
31.0.50; completion styles substring and flex are broken

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Stephen Berman <stephen.berman <at> gmx.net>, Stefan Monnier <monnier <at> iro.umontreal.ca>, Spencer Baugh <sbaugh <at> janestreet.com>
Cc: 77718 <at> debbugs.gnu.org
Subject: bug#77718: 31.0.50; completion styles substring and flex are broken
Date: Fri, 11 Apr 2025 10:22:46 +0300

> Date: Fri, 11 Apr 2025 00:22:01 +0200
> From:  Stephen Berman via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
> 
> 0. Start Emacs like this:
> 
>    emacs -Q --eval "(custom-set-variables '(completion-category-overrides '((file (styles substring)))))"
> 
>    or like this:
> 
>    emacs -Q --eval "(custom-set-variables '(completion-category-overrides '((file (styles flex)))))"
> 
> 1. Type `C-x d' and at the prompt enter: `/usr/ TAB'.
> => Now the text following the prompt is this: "/usr//" and "/usr/" is
> fontified with face file-name-shadow.
> 
> 2. Type `TAB' again.
> => Now the text following the prompt is this: "//" and the first forward
> slash is fontified with face file-name-shadow.
> 
> 3. Type `TAB' again.
> => Now a *Completions* buffer pops up listing all the directories
> directly under root (dev/, etc/, home/ and so on).
> 
> This only happens with the substring and flex completion styles; with
> any of the other completion styles (basic, partial-completion, emacs22,
> initials), or if Emacs is started just with -Q, then after step 1 as
> expected a *Completions* buffer pops up listing the directories under
> /usr (bin/, include/, lib/ and so on).
> 
> The broken behavior with the substring and flex styles is due to the
> change in completion-pcm--merge-completions in this commit:
> 
> commit 0fbba16387513e7692b46885833e4a9c218251f0
> Author:     Spencer Baugh <sbaugh <at> janestreet.com>
> Commit:     Stefan Monnier <monnier <at> iro.umontreal.ca>
> CommitDate: Tue Apr 8 14:36:30 2025 -0400
> 
>   Preserve an explicit * in pcm-try-completion
>   [...]
>   * lisp/minibuffer.el (completion-pcm--merge-completions): Don't drop
>   important wildcards. (bug#74420)

Thanks, adding the guilty parties to the discussion.

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