emacs diff major mode

[Tomas Crhak]

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In GNU Emacs 21.1.1 (i386-suse-linux, X toolkit, Xaw3d scroll bars)
 of 2002-02-19 on D247
configured using `configure --with-gcc --with-pop --with-system-malloc 
--prefix=/usr --exec-prefix=/usr --infodir=/usr/share/info 
--mandir=/usr/share/man --sharedstatedir=/var/lib --libexecdir=/usr/lib 
--with-x --with-xpm --with-jpeg --with-tiff --with-gif --with-png 
--with-x-toolkit=lucid --x-includes=/usr/X11R6/include 
--x-libraries=/usr/X11R6/lib i386-suse-linux CC=gcc 'CFLAGS=-O2 -march=i486 
-mcpu=i686 -pipe          -DSYSTEM_PURESIZE_EXTRA=25000   
-DSITELOAD_PURESIZE_EXTRA=10000         -D_GNU_SOURCE ' LDFLAGS=-s 
build_alias=i386-suse-linux host_alias=i386-suse-linux 
target_alias=i386-suse-linux'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: POSIX
  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
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

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

Consider the following text in diff mode:

--- x   Thu Feb 21 15:42:53 2002
+++ y   Thu Feb 21 15:42:59 2002
@@ -1,3 +1,3 @@
 aaaaaaaaa
-x
+y
 bbbbbbbbb
--- z   Thu Feb 21 15:43:22 2002
+++ z2  Thu Feb 21 15:44:47 2002
@@ -1,3 +1,3 @@
 aaaaaaaaa
-z
+z2
 bbbbbbbbb


Killing line
--- z   Thu Feb 21 15:43:22 2002
Causes the diff of x and y change.

Even if you paste the lines above directly to a diff buffer, it won't be
copied verbatim, but you get (note the @@ -1,4 +1,4 @@ in diff -u x y).

--- x   Thu Feb 21 15:42:53 2002
+++ y   Thu Feb 21 15:42:59 2002
@@ -1,4 +1,4 @@
 aaaaaaaaa
-x
+y
 bbbbbbbbb
--- z   Thu Feb 21 15:43:22 2002
+++ z2  Thu Feb 21 15:44:47 2002
@@ -1,3 +1,3 @@
 aaaaaaaaa
-z
+z2
 bbbbbbbbb


Tomas