bug#15951: 24.3.50; C-n and C-p don't work in narrowed buffer

bug#15951: 24.3.50; C-n and C-p don't work in narrowed buffer

[Katsumi Yamaoka]

Run Emacs with the -Q option, create a new buffer, and put those
three lines there,

foo
bar
baz

type  C-p  C-p  C-SPC  M-> , and type `C-x n n' so that the last
two lines are visible.  Then you will see C-n and C-p don't work.

In GNU Emacs 24.3.50.1 (i686-pc-cygwin, GTK+ Version 3.8.2)
 of 2013-11-22 on localhost
Bzr revision: 115177 yamaoka@jpl.org-20131121221530-5ip837owjus3yvjc
Windowing system distributor `The Cygwin/X Project', version 11.0.11404000
Configured using:
 `configure --verbose --with-x-toolkit=gtk3'

bug#15951: 24.3.50; C-n and C-p don't work in narrowed buffer

[Stephen Berman]

On Fri, 22 Nov 2013 13:14:49 +0900 Katsumi Yamaoka <yamaoka@jpl.org> wrote:

> Run Emacs with the -Q option, create a new buffer, and put those
> three lines there,
>
> foo
> bar
> baz
>
> type  C-p  C-p  C-SPC  M-> , and type `C-x n n' so that the last
> two lines are visible.  Then you will see C-n and C-p don't work.

This is evidently more fallout from enabling cache-long-scans: if you
set this to nil, C-n and C-p work again.

> In GNU Emacs 24.3.50.1 (i686-pc-cygwin, GTK+ Version 3.8.2)
>  of 2013-11-22 on localhost
> Bzr revision: 115177 yamaoka@jpl.org-20131121221530-5ip837owjus3yvjc
> Windowing system distributor `The Cygwin/X Project', version 11.0.11404000
> Configured using:
>  `configure --verbose --with-x-toolkit=gtk3'

Steve Berman

bug#15951: 24.3.50; C-n and C-p don't work in narrowed buffer

[Katsumi Yamaoka]

Stephen Berman <stephen.berman@gmx.net> wrote:
> On Fri, 22 Nov 2013 13:14:49 +0900 Katsumi Yamaoka <yamaoka@jpl.org> wrote:
>> Run Emacs with the -Q option, create a new buffer, and put those
>> three lines there,

>> foo
>> bar
>> baz

>> type  C-p  C-p  C-SPC  M-> , and type `C-x n n' so that the last
>> two lines are visible.  Then you will see C-n and C-p don't work.

> This is evidently more fallout from enabling cache-long-scans: if you
> set this to nil, C-n and C-p work again.

Thanks.  I confirmed (setq-default cache-long-scans nil) helps.
I overlooked it is buffer-local.

bug#15951: 24.3.50; C-n and C-p don't work in narrowed buffer

[Eli Zaretskii]

> From: Stephen Berman <stephen.berman@gmx.net>
> Date: Fri, 22 Nov 2013 12:59:21 +0100
> Cc: 15951@debbugs.gnu.org
> 
> On Fri, 22 Nov 2013 13:14:49 +0900 Katsumi Yamaoka <yamaoka@jpl.org> wrote:
> 
> > Run Emacs with the -Q option, create a new buffer, and put those
> > three lines there,
> >
> > foo
> > bar
> > baz
> >
> > type  C-p  C-p  C-SPC  M-> , and type `C-x n n' so that the last
> > two lines are visible.  Then you will see C-n and C-p don't work.
> 
> This is evidently more fallout from enabling cache-long-scans: if you
> set this to nil, C-n and C-p work again.

No, this is cache-long-scans doing us a favor and exposing a bug in
our code that uses one of the caches.

Fixed in trunk revision 115190.

Thanks.