bug#4469: 23.1; visual-line-fringe-indicators w/ 80 column lines

[Reiner Steib <reinersteib+gmane@imap.cc>]

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Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

Consider the following file with line of exactly 80 columns:

$ cat 80columns
12345678901234567890123456789012345678901234567890123456789012345678901234567890
line 2...01234567890123456789012345678901234567890123456789012345678901234567890
line 3...01234567890123456789012345678901234567890123456789012345678901234567890

$ emacs-23-1 -geometry 80x10 -Q \
  --eval "(setq visual-line-fringe-indicators
            '(left-curly-arrow right-curly-arrow))" 80columns

The the buffer is displayed fine: Three lines that fit into 80 columns
displayed in 3 "visual lines".


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Then do M-x visual-line-mode RET and get this: "visual line breaks"
are inserted.  The buffer is displayed as 6 "visual lines".


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In fact, I now notice that setting visual-line-fringe-indicators is
irrelevant for the bug.

With ...

$ emacs-23-1 -geometry 80x10 -Q 80columns -f visual-line-mode

... I get:


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As the lines fit into 80 columns, visual-line-mode should not insert
"visual line breaks".

In GNU Emacs 23.1.1 (i686-pc-linux-gnu, GTK+ Version 2.12.9)
 of 2009-07-30 on primula
Windowing system distributor `The X.Org Foundation', version 11.0.10400090
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: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  visual-line-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> M-x v i s <tab> u <tab> <return> M-x r 
e p o r t - e m a c s - b u g <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Making completion list...
Visual-Line mode enabled

Bye, Reiner.
-- 
       ,,,
      (o o)
---ooO-(_)-Ooo---  |  PGP key available  |  http://rsteib.home.pages.de/