GNU bug report logs - #14771
24.3.50; Unable to scroll one line at time at window edges.

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

From: Keith David Bershatsky <esq <at> lawlist.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.3.50; Unable to scroll one line at time at window edges.
Date: Tue, 02 Jul 2013 10:32:28 -0700

Within a recent revision to the Emacs Trunk (probably the last month or so), the default behavior of scrolling one line at a time when reaching the window edges (top / bottom) was disabled.  (setq scroll-step 1) does not fix this.  Setting scroll-conservatively to a high number works only with the down arrow key, but the up arrow key causes emacs to temporarily freeze when reaching the top window edge -- i.e., the dreaded spinning wheel on OSX.

Thanks,

Keith
esq <at> lawlist.com

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In GNU Emacs 24.3.50.1 (x86_64-apple-darwin10.8.0, NS apple-appkit-1038.36)
 of 2013-06-30 on MP.local
Bzr revision: 113237 jan.h.d <at> swipnet.se-20130630163826-ziacr9kyz0hmtkws
Windowing system distributor `Apple', version 10.3.1038
Configured using:
 `configure --with-ns'

Important settings:
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Text

Minor modes in effect:
  yas-global-mode: t
  yas-minor-mode: t
  ido-everywhere: t
  global-highlight-parentheses-mode: t
  desktop-save-mode: t
  global-whitespace-mode: t
  whitespace-mode: t
  global-linum-mode: t
  linum-mode: t
  show-newlines-mode: t
  delete-selection-mode: t
  flyspell-mode: t
  tabbar-mwheel-mode: t
  tabbar-mode: t
  highlight-parentheses-mode: t
  osx-key-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: 1
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent input:
s-N s-w n y s-w n s-w y <escape> x s-v <S-s-left> <M-S-right> 
<M-S-left> r e p o r t - e m a c s - b u g <return
>

Recent messages:
Initializing folder...done
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[yas] Loading compiled snippets from /Users/HOME/.0.data/.0.emacs/elpa/yasnippet-0.8.0/snippets/wl-draft-mode
Type C-c C-x C-z to exit MIME mode, and type C-c C-x ? to get help.
Saving...done
Buffer %INBOX.Drafts/-4 modified; kill anyway? (y or n)  n [2 times]
Buffer %INBOX.Drafts/-4 modified; kill anyway? (y or n)  y

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emacs)

Message #8 received at 14771 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Keith David Bershatsky <esq <at> lawlist.com>
Cc: 14771 <at> debbugs.gnu.org
Subject: Re: bug#14771: 24.3.50;
 Unable to scroll one line at time at window edges.
Date: Tue, 02 Jul 2013 20:52:07 +0300

> Date: Tue, 02 Jul 2013 10:32:28 -0700
> From: Keith David Bershatsky <esq <at> lawlist.com>
> 
> Within a recent revision to the Emacs Trunk (probably the last month or so), the default behavior of scrolling one line at a time when reaching the window edges (top / bottom) was disabled.  (setq scroll-step 1) does not fix this.  Setting scroll-conservatively to a high number works only with the down arrow key, but the up arrow key causes emacs to temporarily freeze when reaching the top window edge -- i.e., the dreaded spinning wheel on OSX.

Setting scroll-step to 1 does what I expect for me, and so does
setting scroll-conservatively to a large number.  However, I don't
have access to OSX to test there.  (These features work on
display-independent level, though, so I'm unsure how a different
system can explain the problems.)

Can you show a minimal recipe, starting from "emacs -Q", to reproduce
this?

Message #11 received at 14771 <at> debbugs.gnu.org (full text, mbox):

From: Jan Djärv <jan.h.d <at> swipnet.se>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Keith David Bershatsky <esq <at> lawlist.com>, 14771 <at> debbugs.gnu.org
Subject: Re: bug#14771: 24.3.50;
 Unable to scroll one line at time at window edges.
Date: Tue, 2 Jul 2013 20:11:59 +0200

Hello.

2 jul 2013 kl. 19:52 skrev Eli Zaretskii <eliz <at> gnu.org>:

>> Date: Tue, 02 Jul 2013 10:32:28 -0700
>> From: Keith David Bershatsky <esq <at> lawlist.com>
>> 
>> Within a recent revision to the Emacs Trunk (probably the last month or so), the default behavior of scrolling one line at a time when reaching the window edges (top / bottom) was disabled.  (setq scroll-step 1) does not fix this.  Setting scroll-conservatively to a high number works only with the down arrow key, but the up arrow key causes emacs to temporarily freeze when reaching the top window edge -- i.e., the dreaded spinning wheel on OSX.
> 
> Setting scroll-step to 1 does what I expect for me, and so does
> setting scroll-conservatively to a large number.  However, I don't
> have access to OSX to test there.  (These features work on
> display-independent level, though, so I'm unsure how a different
> system can explain the problems.)
> 
> Can you show a minimal recipe, starting from "emacs -Q", to reproduce
> this?

(setq scroll-step 1) works fine on OSX 10.8 here, so something else must be the problem.

	Jan D.

Message #16 received at 14771-done <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Keith David Bershatsky <esq <at> lawlist.com>
Cc: jan.h.d <at> swipnet.se, 14771-done <at> debbugs.gnu.org
Subject: Re: bug#14771: 24.3.50;
 Unable to scroll one line at time at window edges.
Date: Sat, 06 Jul 2013 13:45:01 +0300

> From: Keith David Bershatsky <esq <at> lawlist.com>
> Date: Tue, 2 Jul 2013 13:02:08 -0700
> Cc: Eli Zaretskii <eliz <at> gnu.org>
> 
> Just a follow-up.  The following combination is what breaks scroll-step:
> 
> (setq scroll-step 1)
> (setq-default line-spacing 0.5)
> 
> In prior versions of Emacs Trunk (a month or so ago), it was possible to use (setq-default line-spacing 0.5) without interfering with scroll-step, and I believe that scroll-step previously defaulted to 1 without needing to be set manually.
> 
> The two lines of code are the only ones needed to reproduce the issue on OSX 10.6.8.

As I said, this is a very old bug: we were disregarding line-spacing
when computing the canonical line height in pixels.

Revision 113300 on the development trunk fixes that.  I'm therefore
marking this bug done.

Thanks.

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