GNU logs - #79026, boring messages

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Subject: bug#79026: 30.1; TAB in Minibuffer when using a quail input-method should complete the longest common suffix of candidates
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 Content preview:  1. Steps to reproduce: Type the following in a buffer with
 `Fundamental` mode: ``` M-x set-input-method RET TeX RET \ab ``` 2. Expected
 behaviour: `TAB` completes to the only possible option (\above) [...] 
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1. Steps to reproduce: Type the following in a buffer with `Fundamental` 
mode:
```
M-x set-input-method RET TeX RET
\ab
```
2. Expected behaviour: `TAB` completes to the only possible option 
(\above) and inserts `┴`.

3. Actual behaviour: `TAB` pops up the `*Quail Completions*` buffer with 
the following content, and I need to fully type out `\above` for `┴` to 
be inserted in the main buffer:
```
Possible completion and corresponding characters are:
\ab: -
\abo: -
\abov: -
\above:(1/1) 1.┴
```

My question is: How can I get the expected behaviour instead of the 
observed one?


In GNU Emacs 30.1 (build 1, x86_64-pc-linux-gnu, X toolkit, cairo
version 1.18.2, Xaw3d scroll bars)
Windowing system distributor 'The X.Org Foundation', version 11.0.12101016
System Description: NixOS 25.05 (Warbler)

Configured using:
'configure
--prefix=/nix/store/glh7dkancz0wlk5gh6zii601f0alys2v-emacs-30.1
--disable-build-details --with-modules --with-x-toolkit=lucid
--with-cairo --without-xft --with-compress-install
--with-toolkit-scroll-bars --with-native-compilation
--without-imagemagick --with-mailutils --without-small-ja-dic
--with-tree-sitter --with-xinput2 --without-xwidgets --with-dbus
--with-selinux'

Configured features:
CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 M17N_FLT MODULES NATIVE_COMP NOTIFY
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Important settings:
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To: Cass Alexandru <g.cassian.alexandru@HIDDEN>
Subject: bug#79026: Acknowledgement (30.1; TAB in Minibuffer when using a
 quail input-method should complete the longest common suffix of
 candidates)
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Subject: bug#79026: 30.1; TAB in Minibuffer when using a quail input-method should complete the longest common suffix of candidates
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Date: Tue, 15 Jul 2025 16:53:23 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
In-Reply-To: <2eba7de6-0bf4-4c4f-abb3-f8b941e3bb8f@HIDDEN> (message from
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> Date: Tue, 15 Jul 2025 08:21:56 +0000
> From: Cass Alexandru <g.cassian.alexandru@HIDDEN>
> 
> 1. Steps to reproduce: Type the following in a buffer with `Fundamental` 
> mode:
> ```
> M-x set-input-method RET TeX RET
> \ab
> ```
> 2. Expected behaviour: `TAB` completes to the only possible option 
> (\above) and inserts `┴`.
> 
> 3. Actual behaviour: `TAB` pops up the `*Quail Completions*` buffer with 
> the following content, and I need to fully type out `\above` for `┴` to 
> be inserted in the main buffer:
> ```
> Possible completion and corresponding characters are:
> \ab: -
> \abo: -
> \abov: -
> \above:(1/1) 1.┴
> ```
> 
> My question is: How can I get the expected behaviour instead of the 
> observed one?

It doesn't look like quail-completion (which is the command bound to
TAB in that input method) is supposed to work as you expect.  Instead,
it is a fancy visual feedback for typing long sequences, fancier than
what Emacs usually shows in the echo-area (which is just the list of
candidates for the next character).

IOW, after pressing TAB, you are supposed to:

  . realize that there's just one candidate "\above"
  . type its characters one by one, guided by the moving highlight in
    the *Quail Completions* buffer as you go

Stefan and Arash, am I right?

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Subject: bug#79026: 30.1; TAB in Minibuffer when using a quail input-method should complete the longest common suffix of candidates
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Date: Tue, 15 Jul 2025 17:11:17 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
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[Please use Reply All to reply, to keep everyone CC'ed.]

> Date: Tue, 15 Jul 2025 13:58:41 +0000
> From: Cass Alexandru <g.cassian.alexandru@HIDDEN>
> 
> Hi all,
> 
> On 15/07/2025 15:53, Eli Zaretskii wrote:
> >> Date: Tue, 15 Jul 2025 08:21:56 +0000
> >> From: Cass Alexandru<g.cassian.alexandru@HIDDEN>
> >>
> >> 1. Steps to reproduce: Type the following in a buffer with `Fundamental`
> >> mode:
> >> ```
> >> M-x set-input-method RET TeX RET
> >> \ab
> >> ```
> >> 2. Expected behaviour: `TAB` completes to the only possible option
> >> (\above) and inserts `┴`.
> >>
> >> 3. Actual behaviour: `TAB` pops up the `*Quail Completions*` buffer with
> >> the following content, and I need to fully type out `\above` for `┴` to
> >> be inserted in the main buffer:
> >> ```
> >> Possible completion and corresponding characters are:
> >> \ab: -
> >> \abo: -
> >> \abov: -
> >> \above:(1/1) 1.┴
> >> ```
> >>
> >> My question is: How can I get the expected behaviour instead of the
> >> observed one?
> > It doesn't look like quail-completion (which is the command bound to
> > TAB in that input method) is supposed to work as you expect.  Instead,
> > it is a fancy visual feedback for typing long sequences, fancier than
> > what Emacs usually shows in the echo-area (which is just the list of
> > candidates for the next character).
> >
> > IOW, after pressing TAB, you are supposed to:
> >
> >    . realize that there's just one candidate "\above"
> >    . type its characters one by one, guided by the moving highlight in
> >      the *Quail Completions* buffer as you go
> It was suggested to me on the emacs stackexchange 
> <https://emacs.stackexchange.com/questions/84747/tab-in-minibuffer-when-using-a-quail-input-method-doesnt-complete-the-longest-c> 
> to report this as a bug, though I suppose it's more of a feature 
> request, and if I was more proficient in elisp I could perhaps ascertain 
> how to get the desired behaviour by means of custom function or a 
> `defadvice`. I do think one could argue that greedy suffix completion on 
> tab is the desired behaviour in this circumstance, as this is the 
> behaviour in all other settings where tab-completion is used in emacs 
> (and unix systems generally).
> >
> > Stefan and Arash, am I right?

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> It doesn't look like quail-completion (which is the command bound to
> TAB in that input method) is supposed to work as you expect.  Instead,
> it is a fancy visual feedback for typing long sequences, fancier than
> what Emacs usually shows in the echo-area (which is just the list of
> candidates for the next character).
>
> IOW, after pressing TAB, you are supposed to:
>
>   . realize that there's just one candidate "\above"
>   . type its characters one by one, guided by the moving highlight in
>     the *Quail Completions* buffer as you go
>
> Stefan and Arash, am I right?

I sadly don't know any more than you do about it.
I hope Handa would know better.
I have wished for a quail completion mechanism based on the usual
minibuffer completion, but IIUC it's not completely straightforward.


        Stefan

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Stefan Monnier <monnier@HIDDEN> writes:

>> It doesn't look like quail-completion (which is the command bound to
>> TAB in that input method) is supposed to work as you expect.  Instead,
>> it is a fancy visual feedback for typing long sequences, fancier than
>> what Emacs usually shows in the echo-area (which is just the list of
>> candidates for the next character).
>>
>> IOW, after pressing TAB, you are supposed to:
>>
>>   . realize that there's just one candidate "\above"
>>   . type its characters one by one, guided by the moving highlight in
>>     the *Quail Completions* buffer as you go
>>
>> Stefan and Arash, am I right?
>
> I sadly don't know any more than you do about it.

Same here, sorry.

Best, Arash

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severity 79026 wishlist
thanks

> From: Arash Esbati <arash@HIDDEN>
> Cc: Stefan Monnier <monnier@HIDDEN>, Cass Alexandru
>  <g.cassian.alexandru@HIDDEN>, 79026 <at> debbugs.gnu.org
> Date: Wed, 16 Jul 2025 09:53:51 +0200
> 
> Stefan Monnier <monnier@HIDDEN> writes:
> 
> >> It doesn't look like quail-completion (which is the command bound to
> >> TAB in that input method) is supposed to work as you expect.  Instead,
> >> it is a fancy visual feedback for typing long sequences, fancier than
> >> what Emacs usually shows in the echo-area (which is just the list of
> >> candidates for the next character).
> >>
> >> IOW, after pressing TAB, you are supposed to:
> >>
> >>   . realize that there's just one candidate "\above"
> >>   . type its characters one by one, guided by the moving highlight in
> >>     the *Quail Completions* buffer as you go
> >>
> >> Stefan and Arash, am I right?
> >
> > I sadly don't know any more than you do about it.
> 
> Same here, sorry.

Thanks.  I guess this makes this bug report a request for enhancement,
since no one has implemented TAB completion for input methods.

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Date: Wed, 16 Jul 2025 15:07:14 +0300
Message-Id: <86tt3cibkd.fsf@HIDDEN>
From: Eli Zaretskii <eliz@HIDDEN>
To: Arash Esbati <arash@HIDDEN>
In-Reply-To: <m2ecug1shc.fsf@HIDDEN> (message from Arash Esbati
 on Wed, 16 Jul 2025 09:53:51 +0200)
Subject: Re: bug#79026: 30.1; TAB in Minibuffer when using a quail
 input-method should complete the longest common suffix of candidates
References: <2eba7de6-0bf4-4c4f-abb3-f8b941e3bb8f@HIDDEN>
 <86cya1k1bg.fsf@HIDDEN> <jwv34ax1qbn.fsf-monnier+emacs@HIDDEN>
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severity 79026 wishlist
thanks

> From: Arash Esbati <arash@HIDDEN>
> Cc: Stefan Monnier <monnier@HIDDEN>, Cass Alexandru
>  <g.cassian.alexandru@HIDDEN>, 79026 <at> debbugs.gnu.org
> Date: Wed, 16 Jul 2025 09:53:51 +0200
> 
> Stefan Monnier <monnier@HIDDEN> writes:
> 
> >> It doesn't look like quail-completion (which is the command bound to
> >> TAB in that input method) is supposed to work as you expect.  Instead,
> >> it is a fancy visual feedback for typing long sequences, fancier than
> >> what Emacs usually shows in the echo-area (which is just the list of
> >> candidates for the next character).
> >>
> >> IOW, after pressing TAB, you are supposed to:
> >>
> >>   . realize that there's just one candidate "\above"
> >>   . type its characters one by one, guided by the moving highlight in
> >>     the *Quail Completions* buffer as you go
> >>
> >> Stefan and Arash, am I right?
> >
> > I sadly don't know any more than you do about it.
> 
> Same here, sorry.

Thanks.  I guess this makes this bug report a request for enhancement,
since no one has implemented TAB completion for input methods.

Last modified: Wed, 16 Jul 2025 12:15:02 UTC

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