GNU bug report logs - #10902
24.0.93; Point displayed after end of buffer with scroll-margin

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Package: emacs;

Reported by: Johan Bockgård <bojohan <at> gnu.org>

Date: Mon, 27 Feb 2012 19:22:01 UTC

Severity: normal

Found in version 24.0.93

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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Report forwarded to bug-gnu-emacs <at> gnu.org:
bug#10902; Package emacs. (Mon, 27 Feb 2012 19:22:01 GMT) Full text and rfc822 format available.
Acknowledgement sent to Johan Bockgård <bojohan <at> gnu.org>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs <at> gnu.org. (Mon, 27 Feb 2012 19:22:01 GMT) Full text and rfc822 format available.

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

From: Johan Bockgård <bojohan <at> gnu.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.93; Point displayed after end of buffer with scroll-margin
Date: Mon, 27 Feb 2012 20:18:09 +0100

emacs -Q

Eval

    (progn
      (pop-to-buffer (get-buffer-create "*foo*"))
      (dotimes (n 5) (insert "x\n"))
      (goto-char (point-min))
      (setq scroll-margin 100)
      (set-window-text-height nil (+ 5 2)))

Press `M->'

  => Point is displayed one line below the end of the buffer.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#10902; Package emacs. (Mon, 27 Feb 2012 20:37:02 GMT) Full text and rfc822 format available.

Message #8 received at 10902 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Johan Bockgård <bojohan <at> gnu.org>
Cc: 10902 <at> debbugs.gnu.org
Subject: Re: bug#10902: 24.0.93;
	Point displayed after end of buffer with scroll-margin
Date: Mon, 27 Feb 2012 22:36:04 +0200

> From: Johan Bockgård <bojohan <at> gnu.org>
> Date: Mon, 27 Feb 2012 20:18:09 +0100
> 
> 
> emacs -Q
> 
> Eval
> 
>     (progn
>       (pop-to-buffer (get-buffer-create "*foo*"))
>       (dotimes (n 5) (insert "x\n"))
>       (goto-char (point-min))
>       (setq scroll-margin 100)
>       (set-window-text-height nil (+ 5 2)))
> 
> Press `M->'
> 
>   => Point is displayed one line below the end of the buffer.

The same happens in Emacs 23, so this isn't a regression in Emacs 24.

I will take a look soon.  Thanks for reporting this.

P.S.  Is there a real-life use-case behind this?  I mean, setting a
scroll margin that is wider than the window sounds... how should I put
it... weird, no?
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#10902; Package emacs. (Mon, 27 Feb 2012 22:20:02 GMT) Full text and rfc822 format available.

Message #11 received at 10902 <at> debbugs.gnu.org (full text, mbox):

From: Johan Bockgård <bojohan <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 10902 <at> debbugs.gnu.org
Subject: Re: bug#10902: 24.0.93;
	Point displayed after end of buffer with scroll-margin
Date: Mon, 27 Feb 2012 23:15:55 +0100

Eli Zaretskii <eliz <at> gnu.org> writes:

>> From: Johan Bockgård <bojohan <at> gnu.org>
>> Date: Mon, 27 Feb 2012 20:18:09 +0100
>> 
>> 
>> emacs -Q
>> 
>> Eval
>> 
>>     (progn
>>       (pop-to-buffer (get-buffer-create "*foo*"))
>>       (dotimes (n 5) (insert "x\n"))
>>       (goto-char (point-min))
>>       (setq scroll-margin 100)
>>       (set-window-text-height nil (+ 5 2)))
>> 
>> Press `M->'
>> 
>>   => Point is displayed one line below the end of the buffer.
>
> The same happens in Emacs 23, so this isn't a regression in Emacs 24.

Yes, I noticed that after sending the report. Actually, it happens
already in Emacs 21.

(BTW, I cannot reproduce it in emacs -nw.)

> I will take a look soon.  Thanks for reporting this.
>
> P.S.  Is there a real-life use-case behind this?  I mean, setting a
> scroll margin that is wider than the window sounds... how should I put
> it... weird, no?

The precise value of scroll-margin is not important. It happens for any
value > 1.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#10902; Package emacs. (Fri, 02 Mar 2012 11:40:01 GMT) Full text and rfc822 format available.

Message #14 received at 10902 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Johan Bockgård <bojohan <at> gnu.org>
Cc: 10902 <at> debbugs.gnu.org
Subject: Re: bug#10902: 24.0.93;
	Point displayed after end of buffer with scroll-margin
Date: Fri, 02 Mar 2012 13:40:07 +0200

> From: Johan Bockgård <bojohan <at> gnu.org>
> Cc: 10902 <at> debbugs.gnu.org
> Date: Mon, 27 Feb 2012 23:15:55 +0100
> 
> > I will take a look soon.  Thanks for reporting this.
> >
> > P.S.  Is there a real-life use-case behind this?  I mean, setting a
> > scroll margin that is wider than the window sounds... how should I put
> > it... weird, no?
> 
> The precise value of scroll-margin is not important. It happens for any
> value > 1.

But only if the window height is 2 lines more than the buffer line
count, according to my testing.

Anyway, I think I fixed this (in revision 107481 on the trunk).
Please see if there are any leftovers after that fix.

Thanks.
Information forwarded to bug-gnu-emacs <at> gnu.org:
bug#10902; Package emacs. (Sat, 03 Mar 2012 17:30:01 GMT) Full text and rfc822 format available.

Message #17 received at 10902 <at> debbugs.gnu.org (full text, mbox):

From: Johan Bockgård <bojohan <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 10902 <at> debbugs.gnu.org
Subject: Re: bug#10902: 24.0.93;
	Point displayed after end of buffer with scroll-margin
Date: Sat, 03 Mar 2012 18:28:41 +0100

Eli Zaretskii <eliz <at> gnu.org> writes:

>> > I will take a look soon.  Thanks for reporting this.
>> >
>> > P.S.  Is there a real-life use-case behind this?  I mean, setting a
>> > scroll margin that is wider than the window sounds... how should I put
>> > it... weird, no?
>> 
>> The precise value of scroll-margin is not important. It happens for any
>> value > 1.
>
> But only if the window height is 2 lines more than the buffer line
> count, according to my testing.

Mine too.

> Anyway, I think I fixed this (in revision 107481 on the trunk).
> Please see if there are any leftovers after that fix.

It fixes the problem for me. Thanks.
Reply sent to Eli Zaretskii <eliz <at> gnu.org>:
You have taken responsibility. (Sat, 03 Mar 2012 19:09:01 GMT) Full text and rfc822 format available.
Notification sent to Johan Bockgård <bojohan <at> gnu.org>:
bug acknowledged by developer. (Sat, 03 Mar 2012 19:09:02 GMT) Full text and rfc822 format available.

Message #22 received at 10902-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Johan Bockgård <bojohan <at> gnu.org>
Cc: 10902-done <at> debbugs.gnu.org
Subject: Re: bug#10902: 24.0.93;
	Point displayed after end of buffer with scroll-margin
Date: Sat, 03 Mar 2012 21:06:13 +0200

> From: Johan Bockgård <bojohan <at> gnu.org>
> Cc: 10902 <at> debbugs.gnu.org
> Date: Sat, 03 Mar 2012 18:28:41 +0100
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> > I will take a look soon.  Thanks for reporting this.
> >> >
> >> > P.S.  Is there a real-life use-case behind this?  I mean, setting a
> >> > scroll margin that is wider than the window sounds... how should I put
> >> > it... weird, no?
> >> 
> >> The precise value of scroll-margin is not important. It happens for any
> >> value > 1.
> >
> > But only if the window height is 2 lines more than the buffer line
> > count, according to my testing.
> 
> Mine too.
> 
> > Anyway, I think I fixed this (in revision 107481 on the trunk).
> > Please see if there are any leftovers after that fix.
> 
> It fixes the problem for me. Thanks.

Thanks, I'm closing the bug.
bug archived. Request was from Debbugs Internal Request <help-debbugs <at> gnu.org> to internal_control <at> debbugs.gnu.org. (Sun, 01 Apr 2012 11:24:02 GMT) Full text and rfc822 format available.
This bug report was last modified 12 years and 38 days ago.

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