bug#1497: emacs -nw loses display of line number with long lines

bug#1497: emacs -nw loses display of line number with long lines

[Paul R]

To reproduce, open emacs -nw -Q, then type a very long line, for example
typing around 100 random characters, then C-a C-k to kill the string
then maintain C-y to past many times to get a line taking 4 or 5 display
lines. This is your long line. Then hit C-j.

Repeat operation ten times or more to have many such long lines.

Monitor line number in mode-line while operating. At a point, it will
print L??

M-: (line-number-at-pos (point)) will return correct value so it is
likely to be a display problem.

Tested on Linux with emacs 23 cvs -nw in gnome-terminal.

Can't reproduce in X version.

-- 
  Paul

bug#1497: marked as done (emacs -nw loses display of line number with long lines)

[Emacs bug Tracking System]

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Your message dated Fri, 05 Dec 2008 09:40:16 -0500
with message-id <87ej0meldb.fsf@cyd.mit.edu>
and subject line emacs -nw loses display of line number with long lines
has caused the Emacs bug report #1497,
regarding emacs -nw loses display of line number with long lines
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
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-- 
1497: http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=1497
Emacs Bug Tracking System
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From: Paul R <paul.r.ml@gmail.com>
To: submit@emacsbugs.donarmstrong.com
Subject: emacs -nw loses display of line number with long lines
Date: Fri, 05 Dec 2008 12:15:17 +0100
Message-ID: <87abba7u0q.fsf@gmail.com>

To reproduce, open emacs -nw -Q, then type a very long line, for example
typing around 100 random characters, then C-a C-k to kill the string
then maintain C-y to past many times to get a line taking 4 or 5 display
lines. This is your long line. Then hit C-j.

Repeat operation ten times or more to have many such long lines.

Monitor line number in mode-line while operating. At a point, it will
print L??

M-: (line-number-at-pos (point)) will return correct value so it is
likely to be a display problem.

Tested on Linux with emacs 23 cvs -nw in gnome-terminal.

Can't reproduce in X version.

-- 
  Paul



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From: Chong Yidong <cyd@stupidchicken.com>
To: Paul R <paul.r.ml@gmail.com>
Cc: 1497-done@emacsbugs.donarmstrong.com
Subject: emacs -nw loses display of line number with long lines
Date: Fri, 05 Dec 2008 09:40:16 -0500
Message-ID: <87ej0meldb.fsf@cyd.mit.edu>

This is not a bug.  From the Emacs manual:

     Line-number computation can also be slow if the lines in the buffer
  are too long.  For this reason, Emacs doesn't display line numbers if
  the average width, in characters, of lines near point is larger than
  the value of `line-number-display-limit-width'.  The default value is
  200 characters.

bug#1497: emacs -nw loses display of line number with long lines

[Eli Zaretskii]

> From: Paul R <paul.r.ml@gmail.com>
> Package: emacs
> Version: 23
> Date: Fri, 05 Dec 2008 12:15:17 +0100
> Cc: 
> 
> To reproduce, open emacs -nw -Q, then type a very long line, for example
> typing around 100 random characters, then C-a C-k to kill the string
> then maintain C-y to past many times to get a line taking 4 or 5 display
> lines. This is your long line. Then hit C-j.
> 
> Repeat operation ten times or more to have many such long lines.
> 
> Monitor line number in mode-line while operating. At a point, it will
> print L??
> 
> M-: (line-number-at-pos (point)) will return correct value so it is
> likely to be a display problem.

Could it be due to the value of line-number-display-limit-width?

    line-number-display-limit-width is a variable defined in `C source code'.
    Its value is 200

Did you perhaps exceed the 200-character limit?