bug#1860: 23.0.60; odd white block next to cursor, after typing some spaces

bug#1860: 23.0.60; odd white block next to cursor, after typing some spaces

[Eric Hanchrow]

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the emacs-pretest-bug@gnu.org mailing list.

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

I'm using "urxvt", if it matters.
I started emacs like this:
$ cd /usr/local/src/emacs/src
$ ./emacs -Q -nw

That put me in the *scratch* buffer, naturally.  I then typed

     SPC SPC SPC SPC SPC SPC SPC

The cursor moved to the right, as expected.  But after the last SPC,
something strange happened: the cursor (a solid white rectangle) now
appears twice as wide as it ought to: it's as if columns six and seven
(I count starting from zero, the way column-number-mode does) both
light up whenever the cursor enters them.

I've seen this in other places too, but I can't come up with a simple
description of when it happens.

I honestly don't know if this is a bug or a feature.  If it's a
feature, I very much want to disable it.

This version of emacs was built from source whose last CVS checkin
looks like this:

    Author: Glenn Morris <rgm@gnu.org>
    Date:   Sat Jan 10 22:35:59 2009 +0000

        (Acknowledgments): Some more updates based on AUTHORS.

If Emacs crashed, and you have the Emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/usr/local/src/emacs/etc/DEBUG for instructions.


In GNU Emacs 23.0.60.10 (i686-pc-linux-gnu, GTK+ Version 2.14.4)
 of 2009-01-10 on debian
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: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  tool-bar-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

Recent input:
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC
SPC SPC SPC SPC SPC SPC SPC SPC SPC SPC ESC x r e p
o r t - e m TAB RET

Recent messages:
("./emacs" "-Q")
For information about GNU Emacs and the GNU system, type C-h C-a.

bug#1860: Acknowledgement (23.0.60; odd white block next to cursor, after typing some spaces)

[Eric Hanchrow]

xterm doesn't exhibit this problem; someone on IRC said that
gnome-terminal does.

bug#1860: 23.0.60; odd white block next to cursor, after typing some spaces

[Leonardo Etcheverry]

Eric,

After you brought up this issue in #emacs yesterday, I spent some time
reading the urxvt documentation and found this:

-ptab|+ptab
    If enabled (default), "Horizontal Tab" characters are being stored as
actual wide characters in the screen buffer, which makes it possible to
select and paste them. Since a horizontal tab is a cursor movement and not
an actual glyph, this can sometimes be visually annoying as the cursor on a
tab character is displayed as a wide cursor; resource pastableTabs. 

If you start urxvt with the +ptab option the double sized cursor goes away;
at least testing it with emacs -Q -nw

leo___


Eric Hanchrow-2 wrote:
> 
> I'm using "urxvt", if it matters.
> I started emacs like this:
> $ cd /usr/local/src/emacs/src
> $ ./emacs -Q -nw
> 
> That put me in the *scratch* buffer, naturally.  I then typed
> 
>      SPC SPC SPC SPC SPC SPC SPC
> 
> The cursor moved to the right, as expected.  But after the last SPC,
> something strange happened: the cursor (a solid white rectangle) now
> appears twice as wide as it ought to: it's as if columns six and seven
> (I count starting from zero, the way column-number-mode does) both
> light up whenever the cursor enters them.
> 
> I've seen this in other places too, but I can't come up with a simple
> description of when it happens.
> 
> I honestly don't know if this is a bug or a feature.  If it's a
> feature, I very much want to disable it.
> 
> 
> 

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