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bug#2409: 23.0.90; org-mode + viper-mode + ns make typing unresponsive

From: Steve Purcell
Subject: bug#2409: 23.0.90; org-mode + viper-mode + ns make typing unresponsive
Date: Fri, 20 Feb 2009 15:16:52 +0100

Typing into an org buffer becomes very unresponsive under viper-mode. The input cursor flickers rapidly between windows, and entered characters are not immediately displayed.

I could not reproduce this bug via "emacsclient -t" -- it appears to affect only my Emacs' main NS frame.

How to reproduce:

Fire up emacs with -q.

Start viper-mode (M-x viper-mode, then 'n', '5', 'n').

Open an org document. Split the window, e.g. with C-x 2, so that the org doc is in one window, and a different buffer (e.g. *scratch*) is in the other window. You'll need to "M-x viper-mode" in the *scratch* buffer to flip it into viper mode too.

Now, enter insert mode in *scratch* (i) and type a few words. The typing should be responsive, with no cursor flicker.

Now switch to the org buffer and try the same. The typing becomes unresponsive, with a delay before the characters/words appear, and the cursor will flicker rapidly between the two buffers.

The lack of responsiveness has caused me to give up on CVS Emacs for now, since I'm so reliant on org-mode, and although I looked briefly in the org code for a possible cause, I didn't discover anything.

I've observed the flickering from non-org buffers, but not to the same extent, and I haven't detected a pattern.

If I remember correctly, this started sometime in January; I update my Emacs and Org from CVS/git almost daily, so either could be at fault.

In GNU Emacs (i386-apple-darwin9.6.0, NS apple-appkit-949.43)
 of 2009-02-20 on mandala.as24.local
Windowing system distributor `Apple', version 10.3.949
configured using `configure  '--with-ns''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Help

Minor modes in effect:
  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
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t
  view-mode: t

Recent input:

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Loading url...done
Loading vc-git...done
View mode: type C-h for help, h for commands, q to quit.
Buffer is read-only: #<buffer HELLO>
Type C-x 1 to delete the help window.
Making completion list... [3 times]

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