GNU bug report logs - #43007
27.1; M-j doesn't behave properly in comments

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Alessio Vanni <vannilla <at> firemail.cc>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1; M-j doesn't behave properly in comments
Date: Sun, 23 Aug 2020 23:53:37 +0200

I normally use M-j to continue a long comment over multiple lines.
Recently, this feature broke in a rather weird way: new lines are opened
as a comment, but the new line is placed above the line with the point,
rather than below.  In some other cases, the line appears in the correct
place, but opening a new line results in a '*' character instead of a
comment (the character is used on modes where '*' is part of a comment,
like `js-mode' or `cc-mode'.)

This happens when running "emacs -Q" too.

Example:

// some comment.

Becomes:

//
// some comment.

Alternatively:

// some comment.
//
//
  *
  *
  *
  *

(the '*' just keeps happening for every M-j.)

In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, cairo version 1.16.0)
 of 2020-08-12 built on localhost
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Gentoo/Linux

Configured using:
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 --localstatedir=/var/lib --disable-silent-rules
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 -march=native' CPPFLAGS= 'LDFLAGS=-Wl,-O1 -Wl,--as-needed''

Configured features:
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HARFBUZZ M17N_FLT LIBOTF ZLIB OLDXMENU X11 XDBE XIM MODULES THREADS JSON
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Message #8 received at 43007 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Alessio Vanni <vannilla <at> firemail.cc>
Cc: 43007 <at> debbugs.gnu.org
Subject: Re: bug#43007: 27.1; M-j doesn't behave properly in comments
Date: Mon, 24 Aug 2020 03:41:04 +0200

Alessio Vanni <vannilla <at> firemail.cc> writes:

> I normally use M-j to continue a long comment over multiple lines.
> Recently, this feature broke in a rather weird way: new lines are opened
> as a comment, but the new line is placed above the line with the point,
> rather than below.  In some other cases, the line appears in the correct
> place, but opening a new line results in a '*' character instead of a
> comment (the character is used on modes where '*' is part of a comment,
> like `js-mode' or `cc-mode'.)
>
> This happens when running "emacs -Q" too.
>
> Example:
>
> // some comment.
>
> Becomes:
>
> //
> // some comment.

This happens for me, too, if I have point behind the "//" characters.
But that seems like a natural behaviour?

> Alternatively:
>
> // some comment.
> //
> //
>   *
>   *
>   *
>   *
>
> (the '*' just keeps happening for every M-j.)

I'm unable to reproduce this in Emacs 28.  Where is point when you hit M-j?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #11 received at 43007 <at> debbugs.gnu.org (full text, mbox):

From: Alessio Vanni <vannilla <at> firemail.cc>
To: 43007 <at> debbugs.gnu.org
Subject: Re: bug#43007: 27.1; M-j doesn't behave properly in comments
Date: Mon, 24 Aug 2020 13:47:00 +0200

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> This happens for me, too, if I have point behind the "//" characters.
> But that seems like a natural behaviour?

When the point is at the end of the line, as it's normal after writing
something, the new line is still being opened above.

I should add that after testing it some more after sending the bug
report, it managed to create a new line above a paragraph that was
disconnected to the one I was currently editing, like so (the |
character is the point):

// Paragraph one.
// With some other lines.

normal(text);

// Another paragraph
// begins here.|

Which became:

// |
// Paragraph one.
// With some other lines.

normal(text);

// Another paragraph
// begins here.

> I'm unable to reproduce this in Emacs 28.  Where is point when you hit M-j?

The point is always in the spot placed by M-j.  In the case of //, it's
after the space (so 3 characters after the beginning of the line), in
case of *, it's right after the star without any spaces.  The first time
I press the keybinding the point is at the end of the line, as shown in
the example above.

This is happening consistently, both in my customized session and with
emacs -Q.  The end result is relatively random and sometimes it doesn't
break immediately, but it happens eventually after a while that I'm
editing a file.

Message #14 received at 43007 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Alan Mackenzie <acm <at> muc.de>
Cc: 43007 <at> debbugs.gnu.org, Alessio Vanni <vannilla <at> firemail.cc>
Subject: Re: 27.1; M-j doesn't behave properly in comments
Date: Mon, 23 Nov 2020 19:23:29 +0200

> From: Alessio Vanni <vannilla <at> firemail.cc>
> Date: Sun, 23 Aug 2020 23:53:37 +0200
> 
> I normally use M-j to continue a long comment over multiple lines.
> Recently, this feature broke in a rather weird way: new lines are opened
> as a comment, but the new line is placed above the line with the point,
> rather than below.  In some other cases, the line appears in the correct
> place, but opening a new line results in a '*' character instead of a
> comment (the character is used on modes where '*' is part of a comment,
> like `js-mode' or `cc-mode'.)
> 
> This happens when running "emacs -Q" too.
> 
> Example:
> 
> // some comment.
> 
> Becomes:
> 
> //
> // some comment.
> 
> Alternatively:
> 
> // some comment.
> //
> //
>   *
>   *
>   *
>   *
> 
> (the '*' just keeps happening for every M-j.)

Alan, please look into this.  Lars says he can reproduce, but I
cannot, at least not in "emacs -Q" with Emacs 27.1.  Can you?

Message #17 received at 43007 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Alessio Vanni <vannilla <at> firemail.cc>
Cc: 43007 <at> debbugs.gnu.org
Subject: Re: bug#43007: 27.1; M-j doesn't behave properly in comments
Date: Sat, 31 Jul 2021 15:12:23 +0200

Alessio Vanni <vannilla <at> firemail.cc> writes:

> I should add that after testing it some more after sending the bug
> report, it managed to create a new line above a paragraph that was
> disconnected to the one I was currently editing, like so (the |
> character is the point):
>
> // Paragraph one.
> // With some other lines.
>
> normal(text);
>
> // Another paragraph
> // begins here.|
>
> Which became:
>
> // |
> // Paragraph one.
> // With some other lines.
>
> normal(text);
>
> // Another paragraph
> // begins here.

I'm unable to reproduce this in Emacs 27.1 or Emacs 28 (with "emacs
-Q").  Are you still seeing this issue?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #22 received at 43007 <at> debbugs.gnu.org (full text, mbox):

From: Alessio Vanni <vannilla <at> firemail.cc>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 43007 <at> debbugs.gnu.org
Subject: Re: bug#43007: 27.1; M-j doesn't behave properly in comments
Date: Sat, 31 Jul 2021 21:19:58 +0200

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> I'm unable to reproduce this in Emacs 27.1 or Emacs 28 (with "emacs
> -Q").  Are you still seeing this issue?

Lately I haven't, but I had it happen randomly some time ago. I don't
remember how long it has been, maybe a month or so.

When it happened, the result was the same as what I had reported,
nothing more, nothing less.

Unfortunately I can't really provide anything else. The file being
edited doesn't seem to be related and neither seem to be the major mode
(as long as it's for a programming language), as I had it happen in
different modes, some of which being shipped with Emacs (i.e. are not
being installed by third-party packages.)

Thanks for looking into this,
A.V.

Message #25 received at 43007 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Alessio Vanni <vannilla <at> firemail.cc>
Cc: 43007 <at> debbugs.gnu.org
Subject: Re: bug#43007: 27.1; M-j doesn't behave properly in comments
Date: Sun, 01 Aug 2021 12:24:57 +0200

Alessio Vanni <vannilla <at> firemail.cc> writes:

> Unfortunately I can't really provide anything else. The file being
> edited doesn't seem to be related and neither seem to be the major mode
> (as long as it's for a programming language), as I had it happen in
> different modes, some of which being shipped with Emacs (i.e. are not
> being installed by third-party packages.)

When this happens, does it happen consistently?  If that's the case, can
you do a `C-h k M-j' to confirm that the key binding hasn't been changed
to something else?  And also examine the value of the
`comment-line-break-function' variable.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #28 received at 43007 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Alessio Vanni <vannilla <at> firemail.cc>
Cc: 43007 <at> debbugs.gnu.org
Subject: Re: bug#43007: 27.1; M-j doesn't behave properly in comments
Date: Sun, 29 Aug 2021 22:21:58 +0200

Lars Ingebrigtsen <larsi <at> gnus.org> writes:

> Alessio Vanni <vannilla <at> firemail.cc> writes:
>
>> Unfortunately I can't really provide anything else. The file being
>> edited doesn't seem to be related and neither seem to be the major mode
>> (as long as it's for a programming language), as I had it happen in
>> different modes, some of which being shipped with Emacs (i.e. are not
>> being installed by third-party packages.)
>
> When this happens, does it happen consistently?  If that's the case, can
> you do a `C-h k M-j' to confirm that the key binding hasn't been changed
> to something else?  And also examine the value of the
> `comment-line-break-function' variable.

This was a month ago, so I'm guessing it'll be difficult to make further
progress here, and I'm closing this bug report.  If further progress can
be made, please respond to this email and we'll reopen the bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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