GNU bug report logs - #10076
24.0.91; Automatic horizontal scrolling

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

From: Dani Moncayo <dmoncayo <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.0.91; Automatic horizontal scrolling
Date: Sat, 19 Nov 2011 19:24:54 +0100

Recipe from "emacs -Q":

1. Type "C-p".
--> Without this, the bug does not show up.

2. Type "C-u 2 C-x < SPC".
--> This scrolls the buffer two position to the left (ok).

3. Type "C-p C-p".
--> The buffer automatically scrolls back to its original position,
which is wrong (see [a]).


---- Footnotes ----

[a] Last paragraph of (info "(emacs)Horizontal Scrolling"):
    If you use those commands to scroll a window horizontally, that sets
 a lower bound for automatic horizontal scrolling.  Automatic scrolling
 will continue to scroll the window, but never farther to the right than
 the amount you previously set by `scroll-left'.


In GNU Emacs 24.0.91.1 (i386-mingw-nt6.1.7601)
 of 2011-11-17 on DANI-PC
Windowing system distributor `Microsoft Corp.', version 6.1.7601
configured using `configure --with-gcc (4.5)'

-- 
Dani Moncayo

Message #8 received at 10076 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Dani Moncayo <dmoncayo <at> gmail.com>
Cc: 10076 <at> debbugs.gnu.org
Subject: Re: bug#10076: 24.0.91; Automatic horizontal scrolling
Date: Sat, 19 Nov 2011 21:16:00 +0200

> Date: Sat, 19 Nov 2011 19:24:54 +0100
> From: Dani Moncayo <dmoncayo <at> gmail.com>
> 
> Recipe from "emacs -Q":
> 
> 1. Type "C-p".
> --> Without this, the bug does not show up.
> 
> 2. Type "C-u 2 C-x < SPC".
> --> This scrolls the buffer two position to the left (ok).
> 
> 3. Type "C-p C-p".
> --> The buffer automatically scrolls back to its original position,
> which is wrong (see [a]).

This happens in Emacs 23.3 as well, so this isn't a regression.

I will try to take a look at it when I have time and see if it's
something simple to fix.

Message #11 received at 10076 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: dmoncayo <at> gmail.com
Cc: 10076 <at> debbugs.gnu.org
Subject: Re: bug#10076: 24.0.91; Automatic horizontal scrolling
Date: Sat, 19 Nov 2011 21:54:26 +0200

> Date: Sat, 19 Nov 2011 21:16:00 +0200
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 10076 <at> debbugs.gnu.org
> 
> > Date: Sat, 19 Nov 2011 19:24:54 +0100
> > From: Dani Moncayo <dmoncayo <at> gmail.com>
> > 
> > Recipe from "emacs -Q":
> > 
> > 1. Type "C-p".
> > --> Without this, the bug does not show up.
> > 
> > 2. Type "C-u 2 C-x < SPC".
> > --> This scrolls the buffer two position to the left (ok).
> > 
> > 3. Type "C-p C-p".
> > --> The buffer automatically scrolls back to its original position,
> > which is wrong (see [a]).
> 
> This happens in Emacs 23.3 as well, so this isn't a regression.
> 
> I will try to take a look at it when I have time and see if it's
> something simple to fix.

I found an easy band-aid, and fixed this in revision 106431 on the
trunk.

(The fundamental problem here is that posn-at-point can return nil, if
point is invisible in the window, and line-move-visual doesn't handle
this situation.  Can point be invisible in some case that doesn't
involve hscroll?)

Message #16 received at 10076-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: 10076-done <at> debbugs.gnu.org
Subject: Re: bug#10076: 24.0.91; Automatic horizontal scrolling
Date: Sat, 19 Nov 2011 22:01:23 +0200

> Date: Sat, 19 Nov 2011 21:54:26 +0200
> From: Eli Zaretskii <eliz <at> gnu.org>
> Cc: 10076 <at> debbugs.gnu.org
> 
> I found an easy band-aid, and fixed this in revision 106431 on the
> trunk.

Closing.

Message #19 received at 10076 <at> debbugs.gnu.org (full text, mbox):

From: Johan Bockgård <bojohan <at> gnu.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 10076 <at> debbugs.gnu.org
Subject: Re: bug#10076: 24.0.91; Automatic horizontal scrolling
Date: Sat, 19 Nov 2011 21:35:00 +0100

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

> (The fundamental problem here is that posn-at-point can return nil, if
> point is invisible in the window, and line-move-visual doesn't handle
> this situation.  Can point be invisible in some case that doesn't
> involve hscroll?)

It also happens during ordinary scrolling

http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7046#23

Message #22 received at 10076 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Johan Bockgård <bojohan <at> gnu.org>
Cc: 10076 <at> debbugs.gnu.org
Subject: Re: bug#10076: 24.0.91; Automatic horizontal scrolling
Date: Sat, 19 Nov 2011 23:13:13 +0200

> From: Johan Bockgård <bojohan <at> gnu.org>
> Cc: 10076 <at> debbugs.gnu.org
> Date: Sat, 19 Nov 2011 21:35:00 +0100
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> > (The fundamental problem here is that posn-at-point can return nil, if
> > point is invisible in the window, and line-move-visual doesn't handle
> > this situation.  Can point be invisible in some case that doesn't
> > involve hscroll?)
> 
> It also happens during ordinary scrolling
> 
> http://debbugs.gnu.org/cgi/bugreport.cgi?bug=7046#23

The problem with posn-at-point returning nil is that you have no way
of knowing the horizontal position of point.

Does it help to call line-move-1 in line-move instead of
line-move-visual, when posn-at-point returns nil?

Message #25 received at 10076 <at> debbugs.gnu.org (full text, mbox):

From: Dani Moncayo <dmoncayo <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 10076 <at> debbugs.gnu.org
Subject: Re: bug#10076: 24.0.91; Automatic horizontal scrolling
Date: Sat, 19 Nov 2011 22:19:24 +0100

> I found an easy band-aid, and fixed this in revision 106431 on the
> trunk.

Thanks Eli.  Your patch also seem to fix bug #7526, which could be closed too.

-- 
Dani Moncayo

Message #28 received at 10076 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Dani Moncayo <dmoncayo <at> gmail.com>
Cc: 7526-done <at> debbugs.gnu.org, 10076 <at> debbugs.gnu.org
Subject: Re: bug#10076: 24.0.91; Automatic horizontal scrolling
Date: Sun, 20 Nov 2011 20:27:35 +0200

> Date: Sat, 19 Nov 2011 22:19:24 +0100
> From: Dani Moncayo <dmoncayo <at> gmail.com>
> Cc: 10076 <at> debbugs.gnu.org
> 
> > I found an easy band-aid, and fixed this in revision 106431 on the
> > trunk.
> 
> Thanks Eli.  Your patch also seem to fix bug #7526, which could be closed too.

Done, thanks.

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