GNU bug report logs - #38101
User's customization to completion-styles requires tweak to completion-category-defaults

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Package: emacs; Reported by: João Távora <joaotavora@HIDDEN>; merged with #22324; dated Thu, 7 Nov 2019 14:23:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Removed tag(s) moreinfo. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.
Forcibly Merged 22324 38101. Request was from Lars Ingebrigtsen <larsi@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Stefan Monnier <monnier@HIDDEN>
To: =?windows-1252?B?Sm/jbyBU4XZvcmE=?= <joaotavora@HIDDEN>
Subject: Re: bug#38101: User's customization to completion-styles requires
 tweak to completion-category-defaults
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>> >     (setq completion-styles '(flex))
>> >     (setq completion-category-defaults nil)

Right: `completion-category-defaults` lets us specify different default
completion styles for particular cases, but it doesn't clearly says "how
different" and instead just overrides the global setting.

In practice it's been used so far to override the default (mostly)
prefix completion with substring completion, IOW the override is
performed in order to use a "more lax" completion (where "lax" here can
be understood as the size of the set of matching candidates for a given
pattern: `substring` matches more candidates than `basic` so it is "more
lax").

But if the user sets the default completion style to a "very lax" style
such as `flex` then the override doesn't work as intended any more.

It won't completely prevent the use of `flex` luckily:

    (defun completion--styles (metadata)
      (let* ((cat (completion-metadata-get metadata 'category))
             (over (completion--category-override cat 'styles)))
        (if over
            (delete-dups (append (cdr over) (copy-sequence completion-styles)))
           completion-styles)))

So, if the default `completion-styles` is `(flex)` and the
`completion-category-defaults` specifies, say, `(basic substring)`, then
the result is to use `(basic substring flex)` which still includes
`flex` (hence the problem is not too crippling) but `flex` will only be
used when both `basic` and `substring` fail to find any matching
candidates, which is not what was desired.  In this specific case is
`basic` or `substring` find matching candidates those would also have
been returned by `flex` and (presumably) with the best scores, so the
end result (compared to only using `flex`) is mostly that *Completions*
gets truncated.


        Stefan





Information forwarded to bug-gnu-emacs@HIDDEN:
bug#38101; Package emacs. Full text available.

Message received at 38101 <at> debbugs.gnu.org:


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Subject: Re: bug#38101: User's customization to completion-styles requires
 tweak to completion-category-defaults
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> From: João Távora <joaotavora@HIDDEN>
> Date: Fri, 8 Nov 2019 15:15:35 +0000
> Cc: Stefan Monnier <monnier@HIDDEN>, 38101 <at> debbugs.gnu.org
> 
> JT >  completion-category-defaults
> JT > needs to be tweaked to "unshadow" the user's customization to
> JT > completion-styles.
> 
> This means that if you customize completion-styles, you also need
> to tweak completion-category-defaults, because the latter shadows
> the former. Stefan thinks this is a bug, and so do I.
> 
> Moreover, Stefan has stated that you need to "constantly" tweak
> completion-category-defaults because other packages might
> add to it.
> 
> I haven't analyzed the problem sufficiently to tell you _why_ the
> shadowing happens, just that it happens.

Thanks, this does explain the issue nicely.




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bug#38101; Package emacs. Full text available.

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Subject: Re: bug#38101: User's customization to completion-styles requires
 tweak to completion-category-defaults
To: Eli Zaretskii <eliz@HIDDEN>
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On Fri, Nov 8, 2019 at 2:20 PM Eli Zaretskii <eliz@HIDDEN> wrote:
>
> > From: Jo=C3=A3o T=C3=A1vora <joaotavora@HIDDEN>
> > Date: Thu, 7 Nov 2019 16:02:03 +0000
> > Cc: 38101 <at> debbugs.gnu.org
> >
> > Sure thing.
> >
> > https://lists.gnu.org/archive/html/emacs-devel/2019-11/msg00227.html
>
> Thanks, but I see no references there to completion-category-defaults
> or anything along those lines.

It's on line 23-24 of the linked email's body.

As I wrote, this is the problem:

JT >  completion-category-defaults
JT > needs to be tweaked to "unshadow" the user's customization to
JT > completion-styles.

This means that if you customize completion-styles, you also need
to tweak completion-category-defaults, because the latter shadows
the former. Stefan thinks this is a bug, and so do I.

Moreover, Stefan has stated that you need to "constantly" tweak
completion-category-defaults because other packages might
add to it.

I haven't analyzed the problem sufficiently to tell you _why_ the
shadowing happens, just that it happens.

Jo=C3=A3o




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#38101; Package emacs. Full text available.

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Subject: Re: bug#38101: User's customization to completion-styles requires
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> From: João Távora <joaotavora@HIDDEN>
> Date: Thu, 7 Nov 2019 16:02:03 +0000
> Cc: 38101 <at> debbugs.gnu.org
> 
> Sure thing.
> 
> https://lists.gnu.org/archive/html/emacs-devel/2019-11/msg00227.html

Thanks, but I see no references there to completion-category-defaults
or anything along those lines.

Perhaps Stefan or someone else could describe the actual problem in
this bug report?

TIA




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Sure thing.

https://lists.gnu.org/archive/html/emacs-devel/2019-11/msg00227.html

Jo=C3=A3o




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Subject: Re: bug#38101: User's customization to completion-styles requires
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> From: João Távora <joaotavora@HIDDEN>
> Date: Thu, 7 Nov 2019 15:09:04 +0000
> Cc: 38101 <at> debbugs.gnu.org
> 
> > Please help me to find this conversation by giving some URL or Subject
> > and Date.
> 
> Sorry Eli, this was sent to me off-list by Stefan.  I just noticed it now.
> (Also very sorry Stefan, this was a mistake).
> 
> Eli, the conversation you want is in Emacs devel, a reply of mine
> to Oscar Fuentes yesterday, with a subject that includes "fido-mode".

Thanks, but that thread is huge, and you've posted quite a lot there.
Could you perhaps state the URL of that message in the emacs-devel
archives?




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On Thu, Nov 7, 2019 at 2:46 PM Eli Zaretskii <eliz@HIDDEN> wrote:
> > Hi maintainers,
> >
> > As you can read in the above conversation, completion-category-defaults
> > needs to be tweaked to "unshadow" the user's customization to
> > completion-styles.
>
> Please help me to find this conversation by giving some URL or Subject
> and Date.

Sorry Eli, this was sent to me off-list by Stefan.  I just noticed it now.
(Also very sorry Stefan, this was a mistake).

Eli, the conversation you want is in Emacs devel, a reply of mine
to Oscar Fuentes yesterday, with a subject that includes "fido-mode".

Jo=C3=A3o




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 (message from =?utf-8?B?Sm/Do28gVMOhdm9yYQ==?= on Thu, 7 Nov 2019 14:22:29
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Subject: Re: bug#38101: User's customization to completion-styles requires
 tweak to completion-category-defaults
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> From: João Távora <joaotavora@HIDDEN>
> Date: Thu, 7 Nov 2019 14:22:29 +0000
> 
> > >     (setq completion-styles '(flex))
> > >     (setq completion-category-defaults nil )
> >
> > Ha, I was just thinking about that: could you open a bug report about
> > the need for tweaking completion-category-defaults?
> > Note: the above `setq` isn't enough because packages can (and do) add
> > themselves to completion-category-defaults later on.
> >
> >         Stefan
> 
> Hi maintainers,
> 
> As you can read in the above conversation, completion-category-defaults
> needs to be tweaked to "unshadow" the user's customization to
> completion-styles.

Please help me to find this conversation by giving some URL or Subject
and Date.

Thanks.




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From: =?UTF-8?B?Sm/Do28gVMOhdm9yYQ==?= <joaotavora@HIDDEN>
Date: Thu, 7 Nov 2019 14:22:29 +0000
Message-ID: <CALDnm51NRMp9ehNpz0OShWfL4CxvSZtLMNUPTbstWZabiydPdg@HIDDEN>
Subject: User's customization to completion-styles requires tweak to
 completion-category-defaults
To: bug-gnu-emacs@HIDDEN
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> >     (setq completion-styles '(flex))
> >     (setq completion-category-defaults nil )
>
> Ha, I was just thinking about that: could you open a bug report about
> the need for tweaking completion-category-defaults?
> Note: the above `setq` isn't enough because packages can (and do) add
> themselves to completion-category-defaults later on.
>
>         Stefan

Hi maintainers,

As you can read in the above conversation, completion-category-defaults
needs to be tweaked to "unshadow" the user's customization to
completion-styles.

This is a bug report to track any possible improvements that can be done
in this regard.

Jo=C3=A3o




Acknowledgement sent to João Távora <joaotavora@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#38101; Package emacs. Full text available.
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