bug#10170: 24.0.91; scroll-conservatively in a c-mode buffer

bug#10170: 24.0.91; scroll-conservatively in a c-mode buffer

[Dani Moncayo]

[-- Attachment #1: Type: text/plain, Size: 745 bytes --]

Recipe from "emacs -Q":

1. Eval: (setq scroll-conservatively 101)
2. Eval: (setq scroll-margin 1)
3. Eval: (custom-set-faces '(mode-line ((t (:box (:line-width 1))))))
4. Visit the attached file (c-mode should be activated automatically).
5. Type: `C-s p'

The point jumps to line "/*p1*/" but an instant later the buffer is
scrolled vertically by 1 line.  This last scrolling should be avoided,
i.e., the buffer should be displayed in the right position without
having to correct its location afterwards.


In GNU Emacs 24.0.91.1 (i386-mingw-nt5.1.2600)
 of 2011-11-25 on DANI-PC
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.6) --cflags -fno-omit-frame-pointer'


-- 
Dani Moncayo

[-- Attachment #2: test.c --]
[-- Type: text/x-csrc, Size: 142 bytes --]

/* this is a test */















































/*p1*/

bug#10170: 24.0.91; scroll-conservatively in a c-mode buffer

[Dani Moncayo]

> 1. Eval: (setq scroll-conservatively 101)
> 2. Eval: (setq scroll-margin 1)
> 3. Eval: (custom-set-faces '(mode-line ((t (:box (:line-width 1))))))
> 4. Visit the attached file (c-mode should be activated automatically).
> 5. Type: `C-s p'
>
> The point jumps to line "/*p1*/" but an instant later the buffer is
> scrolled vertically by 1 line.  This last scrolling should be avoided,
> i.e., the buffer should be displayed in the right position without
> having to correct its location afterwards.

Ping.

I experience this bug everyday, while editing C files.  It would be
sad to release Emacs 24 with this bug.

-- 
Dani Moncayo

bug#10170: 24.0.91; scroll-conservatively in a c-mode buffer

[Eli Zaretskii]

> Date: Wed, 7 Dec 2011 16:04:20 +0100
> From: Dani Moncayo <dmoncayo@gmail.com>
> 
> > 1. Eval: (setq scroll-conservatively 101)
> > 2. Eval: (setq scroll-margin 1)
> > 3. Eval: (custom-set-faces '(mode-line ((t (:box (:line-width 1))))))
> > 4. Visit the attached file (c-mode should be activated automatically).
> > 5. Type: `C-s p'
> >
> > The point jumps to line "/*p1*/" but an instant later the buffer is
> > scrolled vertically by 1 line.  This last scrolling should be avoided,
> > i.e., the buffer should be displayed in the right position without
> > having to correct its location afterwards.
> 
> Ping.
> 
> I experience this bug everyday, while editing C files.  It would be
> sad to release Emacs 24 with this bug.

Cool down.  No one is going to release Emacs 24 any time soon.  This
bug was reported a few days ago, and it's tricky, so I will need more
than a few moments to debug it.  I only have enough time to debug
tricky bugs on weekends.

bug#10170: 24.0.91; scroll-conservatively in a c-mode buffer

[Dani Moncayo]

> Cool down.  No one is going to release Emacs 24 any time soon.  This
> bug was reported a few days ago, and it's tricky, so I will need more
> than a few moments to debug it.  I only have enough time to debug
> tricky bugs on weekends.

Ok Eli.  Take your time.

-- 
Dani Moncayo

bug#10170: 24.0.91; scroll-conservatively in a c-mode buffer

[Eli Zaretskii]

> Date: Wed, 7 Dec 2011 16:04:20 +0100
> From: Dani Moncayo <dmoncayo@gmail.com>
> 
> > 1. Eval: (setq scroll-conservatively 101)
> > 2. Eval: (setq scroll-margin 1)
> > 3. Eval: (custom-set-faces '(mode-line ((t (:box (:line-width 1))))))
> > 4. Visit the attached file (c-mode should be activated automatically).
> > 5. Type: `C-s p'
> >
> > The point jumps to line "/*p1*/" but an instant later the buffer is
> > scrolled vertically by 1 line.  This last scrolling should be avoided,
> > i.e., the buffer should be displayed in the right position without
> > having to correct its location afterwards.
> 
> Ping.
> 
> I experience this bug everyday, while editing C files.  It would be
> sad to release Emacs 24 with this bug.

Fixed in revision 106644 on the trunk.