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bug#2057: marked as done (23.0.60; delete key and deletechar)

From: Emacs bug Tracking System
Subject: bug#2057: marked as done (23.0.60; delete key and deletechar)
Date: Thu, 16 Apr 2009 18:30:04 +0000

Your message dated Thu, 16 Apr 2009 11:17:48 -0700 (PDT)
with message-id <address@hidden>
and subject line Re: bug#2057: 23.0.60; delete key and deletechar
has caused the Emacs bug report #2057,
regarding 23.0.60; delete key and deletechar
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
bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact address@hidden

2057: http://emacsbugs.donarmstrong.com/cgi-bin/bugreport.cgi?bug=2057
Emacs Bug Tracking System
Contact address@hidden with problems
--- Begin Message --- Subject: 23.0.60; delete key and deletechar Date: Sun, 25 Jan 2009 18:01:26 -0500
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 address@hidden mailing list.

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

I start Emacs on Ubuntu 8.10 inside a gnome-terminal emulation
window using the command "emacs -q -nw".  The backspace key on my keyboard is
set up to generate ASCII code 127, but Emacs incorrectly maps this code to
deletechar with input-decode-map which is:

    (keymap (127 . [deletechar]) (27 keymap (79 keymap (83 . ....

I believe this input translation is set up by term_get_fkeys_1 in term.c when
it looks at the termcap/terminfo function key definitions for my terminal
type, xterm-color, and sees that the termcap description contains:


which means that the delete *function* key produces ASCII code 127.

Emacs should look at both kD and kb.  If they are the same ASCII character,
then Emacs should not install a translation in input-decode-map for delete.

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
for instructions.

In GNU Emacs (i686-pc-linux-gnu)
 of 2009-01-18 on ugg
configured using `configure  '--without-x'

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

Major mode: Info

Minor modes in effect:
  savehist-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:
ESC [ > 1 ; 1 7 0 4 ; 0 c C-h i m e m a c s RET C-s
b u g SPC C-a C-n C-f C-f C-f C-f C-f C-f RET SPC SPC
ESC x r e p o r t - e m a c s - b u g RET

Recent messages:
Composing main Info directory...done
Mark saved where search started

--- End Message ---
--- Begin Message --- Subject: Re: bug#2057: 23.0.60; delete key and deletechar Date: Thu, 16 Apr 2009 11:17:48 -0700 (PDT)
Robert Brown <address@hidden> writes:

  > Dan Nicolaescu writes:
  >  > Robert Brown <address@hidden> writes:
  >  > 
  >  >   > I believe the following patch may be the right fix for bug 2057.  
  >  >   > looking at the key sequences generated by function keys, Emacs 
should only
  >  >   > register those that generate two or more ASCII characters.
  >  >   > 
  >  >   > My termcap entry, xterm-color, contains "kD=\177", which means that 
  >  >   > delete *function* key generates code 177.
  >  > 
  >  > Interesting, it seems that you have a modified termcap database, the 
normal one
  >  > has kD=\E[3~ for xterm-color.
  > Yes, it's definitely a bug in the termcap entry.  Hitting the delete
  > function key generates \E[3~ for me.  I can fix the termcap.
  >  > Can you try setting TERM to xterm-256color and see if that the delete
  >  > key works better then?
  > Switching to a different termcap works well.

OK, so it's not an emacs bug, closing this then.

  > I still think it may incorrect for Emacs to map single character function
  > key sequences.  But perhaps these just never occur in practice.

Given that we don't have a positive proof that it causes a problem,
there doesn't seem to be a good reason to change code that has been
around for such a long time.

--- End Message ---

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