GNU logs - #73092, boring messages

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Subject: bug#73092: 31.0.50; Completion lists unbound variables with suffix - (e.g., rcirc-)
Resent-From: Tassilo Horn <tsdh@HIDDEN>
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From: Tassilo Horn <tsdh@HIDDEN>
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Date: Sat, 07 Sep 2024 09:18:23 +0200
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It just occurred to me that variable completion with C-h v lists
non-existent variables with suffix -, e.g., rcirc-, Man-, Info-, info-,
etc.  When selecting one of those, the *Help* buffer just says

--8<---------------cut here---------------start------------->8---
rcirc- is void as a variable.

Not documented as a variable.
--8<---------------cut here---------------end--------------->8---

Yeah, that's correct, but why was it shown in the *Completions* then?

That happens with "emacs -Q" with emacs from git master.


In GNU Emacs 31.0.50 (build 3, x86_64-pc-linux-gnu, GTK+ Version
 3.24.43, cairo version 1.18.2) of 2024-09-06 built on thinkpad-t440p
Repository revision: df57e44a08fd5c7dc159254a40f5d2e4d008e8df
Repository branch: master
System Description: Arch Linux

Configured using:
 'configure --with-tree-sitter --with-pgtk --with-modules'

Configured features:
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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Tassilo Horn <tsdh@HIDDEN>
Subject: bug#73092: Acknowledgement (31.0.50; Completion lists unbound
 variables with suffix - (e.g., rcirc-))
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Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#73092: 31.0.50; Completion lists unbound variables with suffix - (e.g., rcirc-)
Resent-From: Arash Esbati <arash@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
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To: Tassilo Horn <tsdh@HIDDEN>
Cc: 73092 <at> debbugs.gnu.org
From: Arash Esbati <arash@HIDDEN>
In-Reply-To: <877cboyls0.fsf@HIDDEN> (Tassilo Horn's message of "Sat, 07 Sep
 2024 09:18:23 +0200")
References: <877cboyls0.fsf@HIDDEN>
Date: Sat, 07 Sep 2024 11:07:58 +0200
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Tassilo Horn <tsdh@HIDDEN> writes:

> It just occurred to me that variable completion with C-h v lists
> non-existent variables with suffix -, e.g., rcirc-, Man-, Info-, info-,
> etc.  When selecting one of those, the *Help* buffer just says
>
> rcirc- is void as a variable.
>
> Not documented as a variable.
>
> Yeah, that's correct, but why was it shown in the *Completions* then?

I trapped into this as well, have a look at bug#72787.

Best, Arash

Message sent to bug-gnu-emacs@HIDDEN:

Subject: bug#73092: 31.0.50; Completion lists unbound variables with suffix - (e.g., rcirc-)
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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To: Arash Esbati <arash@HIDDEN>
Cc: 73092 <at> debbugs.gnu.org, tsdh@HIDDEN
Date: Sat, 07 Sep 2024 13:00:15 +0300
Message-Id: <86ed5vyea8.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <m25xr7vnkh.fsf@HIDDEN> (message from Arash Esbati
 on Sat, 07 Sep 2024 11:07:58 +0200)
References: <877cboyls0.fsf@HIDDEN> <m25xr7vnkh.fsf@HIDDEN>
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merge 73092 72787
thanks

> Cc: 73092 <at> debbugs.gnu.org
> From: Arash Esbati <arash@HIDDEN>
> Date: Sat, 07 Sep 2024 11:07:58 +0200
> 
> Tassilo Horn <tsdh@HIDDEN> writes:
> 
> > It just occurred to me that variable completion with C-h v lists
> > non-existent variables with suffix -, e.g., rcirc-, Man-, Info-, info-,
> > etc.  When selecting one of those, the *Help* buffer just says
> >
> > rcirc- is void as a variable.
> >
> > Not documented as a variable.
> >
> > Yeah, that's correct, but why was it shown in the *Completions* then?
> 
> I trapped into this as well, have a look at bug#72787.

Indeed, this is a known issue.

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From: Eli Zaretskii <eliz@HIDDEN>
To: Arash Esbati <arash@HIDDEN>
In-Reply-To: <m25xr7vnkh.fsf@HIDDEN> (message from Arash Esbati
 on Sat, 07 Sep 2024 11:07:58 +0200)
Subject: Re: bug#73092: 31.0.50;
 Completion lists unbound variables with suffix - (e.g., rcirc-)
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merge 73092 72787
thanks

> Cc: 73092 <at> debbugs.gnu.org
> From: Arash Esbati <arash@HIDDEN>
> Date: Sat, 07 Sep 2024 11:07:58 +0200
> 
> Tassilo Horn <tsdh@HIDDEN> writes:
> 
> > It just occurred to me that variable completion with C-h v lists
> > non-existent variables with suffix -, e.g., rcirc-, Man-, Info-, info-,
> > etc.  When selecting one of those, the *Help* buffer just says
> >
> > rcirc- is void as a variable.
> >
> > Not documented as a variable.
> >
> > Yeah, that's correct, but why was it shown in the *Completions* then?
> 
> I trapped into this as well, have a look at bug#72787.

Indeed, this is a known issue.

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Date: Sat, 07 Sep 2024 12:02:08 +0200
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Alright, thanks. My debbugs searching foo needs improvement. ;-)

Am Sa, 7. Sep 2024, um 12:00, schrieb Eli Zaretskii:
> merge 73092 72787
> thanks
>
>> Cc: 73092 <at> debbugs.gnu.org
>> From: Arash Esbati <arash@HIDDEN>
>> Date: Sat, 07 Sep 2024 11:07:58 +0200
>> 
>> Tassilo Horn <tsdh@HIDDEN> writes:
>> 
>> > It just occurred to me that variable completion with C-h v lists
>> > non-existent variables with suffix -, e.g., rcirc-, Man-, Info-, info-,
>> > etc.  When selecting one of those, the *Help* buffer just says
>> >
>> > rcirc- is void as a variable.
>> >
>> > Not documented as a variable.
>> >
>> > Yeah, that's correct, but why was it shown in the *Completions* then?
>> 
>> I trapped into this as well, have a look at bug#72787.
>
> Indeed, this is a known issue.

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

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Date: Wed, 25 Sep 2024 19:09:31 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Jordan Ellis Coppard <jc+o.emacs@HIDDEN>,
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Subject: Re: bug#73473: 31.0.50;
 Minibuffer completions include nonsense prefix candidates
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merge 73473 72787
thanks

> Date: Wed, 25 Sep 2024 19:54:59 +0900
> From:  Jordan Ellis Coppard via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@HIDDEN>
> 
> I've noticed that my completions have slowed down A LOT on recent Emacs 
> builds, it turns out nonsense completion candidates (which I am calling 
> "prefix candidates") are being included as... completion candidates. By 
> my rough estimate this results in about... 10,000 extra completion 
> candidates when invoking `C-h o` (with my personal Emacs configuration).
> 
> To reproduce, using `emacs -Q` of course:
> 
> 1. Open Emacs.
> 2. C-h o foo TAB
> 
> Observe that completion candidate `footnote-` is listed and that there 
> are 80 completion candidates.
> 
> If I do the same on the currently released Emacs or another (older) 
> build of Emacs (30.0.50) there are 79 (not 80) completion candidates and 
> `footnote-` is not listed as one.
> 
> This seems to be occurring for almost every unique prefix possible, 
> compounding as time goes on. So later on `f-` is listed as a completion 
> candidate, then also `go-` and so on. These are not valid completion 
> candidates. `footnote-` is not a symbol. Over time the huge increase in 
> completion candidate volume (and perhaps what is causing this behind the 
> scenes) results in such a slowdown that I can visibly see Emacs crawl to 
> 1 FPS when I type in minibuffer completion, when the exact same init.el 
> on said older 30.0.50 is faster.
> 
> This is reproduceable on `emacs -Q` as above, (and the useful bug report 
> probably ends right here) but as an aside: my configuration is minimal, 
> my Emacs starts up in about 0.3s and I keep things minimal because I do 
> not want Emacs to ever take longer than instantaneously to respond to 
> keystrokes (if it has to do some long-running job, or something which 
> takes time that's different since feedback that such a thing has kicked 
> off would/should still be instant).

Thanks, this is a known bug#72787.  I hope someone will be able to
look into it soon.

> Tangentially to this, it would be nice if completions could be decoupled 
> from the UI (i.e. they could stream in, with an API to let the user know 
> when the list is complete) because even on 30.0.50 I can often times 
> type faster than completion can handle which drives me insane (UI 
> hitching)... but that's an aside.

Please file a separate feature request for this, if you think we
should change the design so radically.

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