bug#9549: 24.0.50; longlines showing hard newlines breaks display

[Miguel V. S. Frasson]

Hi.

In longlines-mode, showing hard newlines makes the apparent/displayed

point position to "jump" annoinly.  This bug makes longlines-mode with

longlines-show-hard-newlines useless.

How to reproduce.

1) emacs -Q

2) get some text with some long lines (spaces are necessary).

I do this copying "test " and yanking several times, making several

paragraphs (see recent input below).

3) M-x longlines-mode

4) M-x longlines-show-hard-newlines

5) use arrow keys (up and down) to navigate through the text.

Apparently, when point crosses two C-j, the displayed point goes to

upper right corner (blinks there as it does normally) giving the

impression that point is there.  Sometimes it even "recenters" as if

point where elsewhere.  When (real) point leaves 2 C-j, point behaves

normally.

Regards

Miguel Frasson.

In GNU Emacs 24.0.50.1 (i686-pc-linux-gnu, GTK+ Version 2.24.4)

 of 2011-09-18 on frasson-sam11-u

Windowing system distributor `The X.Org Foundation', version 11.0.11001000

Important settings:

  value of $LC_ALL: nil

  value of $LC_COLLATE: nil

  value of $LC_CTYPE: nil

  value of $LC_MESSAGES: nil

  value of $LC_MONETARY: nil

  value of $LC_NUMERIC: nil

  value of $LC_TIME: nil

  value of $LANG: pt_BR.UTF-8

  value of $XMODIFIERS: nil

  locale-coding-system: utf-8-unix

  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:

  longlines-mode: t

  tooltip-mode: t

  mouse-wheel-mode: t

  tool-bar-mode: t

  use-hard-newlines: t

  menu-bar-mode: t

  file-name-shadow-mode: t

  global-font-lock-mode: t

  font-lock-mode: t

  blink-cursor-mode: t

  auto-composition-mode: t

  auto-encryption-mode: t

  auto-compression-mode: t

  line-number-mode: t

  transient-mark-mode: t

Recent input:

t e s t SPC C-a C-k C-y C-y C-y C-y C-y C-y C-y C-y 

C-y C-y C-a C-k C-y C-y C-y C-y <return> <return> C-y 

C-y C-y C-y C-y C-y <return> <return> C-y C-y C-y C-y 

C-y C-y C-y <return> <return> C-y C-y C-y C-y C-y C-y 

C-y C-y C-y C-y <return> <return> C-y C-y C-y C-y C-y 

C-y C-y C-y C-y C-y M-x l o n g l i n e s - m o d e 

<return> M-x l o n g l i <tab> s h o <tab> <return> 

<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 

<up> <up> <up> <up> <up> <up> <up> <up> <up> <up> <up> 

<up> <up> <up> <up> <up> <up> <up> <up> <down> <down> 

<down> <down> <down> <down> <down> <down> <down> <down> 

<down> <down> <down> <down> <down> <down> <down> <down> 

<down> <down> <down> <down> <help-echo> <help-echo> 

<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 

<menu-bar> <help-menu> <send-emacs-bug-report>

Recent messages:

For information about GNU Emacs and the GNU system, type C-h C-a.

Mark set [47 times]

Longlines mode enabled

Load-path shadows:

None found.

Features:

(shadow sort gnus-util mail-extr message format-spec rfc822 mml easymenu

mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045

ietf-drums mm-util mail-prsvr mailabbrev mail-utils gmm-utils mailheader

emacsbug longlines time-date tooltip ediff-hook vc-hooks lisp-float-type

mwheel x-win x-dnd tool-bar dnd fontset image fringe lisp-mode register

page menu-bar rfn-eshadow timer select scroll-bar mouse jit-lock

font-lock syntax facemenu font-core frame cham georgian utf-8-lang

misc-lang vietnamese tibetan thai tai-viet lao korean japanese hebrew

greek romanian slovak czech european ethiopic indian cyrillic chinese

case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer loaddefs

button faces cus-face files text-properties overlay sha1 md5 base64

format env code-pages mule custom widget hashtable-print-readable

backquote make-network-process dynamic-setting system-font-setting

font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

-- 
Miguel Vinicius Santini Frasson
mvsfrasson@gmail.com