Bug#266701: xterm: Backspace behavior over non-ASCII characters in UTF-8 locale incorrect

[Andrew Moise <chops@demiurgestudios.com>]

Package: xterm
Version: 4.3.0.dfsg.1-6
Severity: normal

  In the en_US.UTF-8 locale, inserting any non-ascii character into the command
line and then backspacing over it seems to backspace over bytes rather than
characters.  If I insert "áõã" (either with compose keys or by cut-and-paste),
I can then backspace over the last few characters of my prompt:

[moise@pogo ~]$
[moise@pogo ~]$ áõã
[moise@pogo ~]$ áõ
[moise@pogo ~]$ á
[moise@pogo ~]$
[moise@pogo ~]$
[moise@pogo ~�

  Also, if I type "lsã" and then backspace one time, I get "zsh: command not
found: ls\M-C" when I hit enter.
  This only happens with zsh (not bash), so it could easily be a zsh bug.  It
doesn't happen with aterm or on the console, though, so I've arbitrarily filed
the bug against xterm :-).
  Just like #266336, this happens with both xterm and "xterm -class UXTerm
-title 'uxterm' -u8" (the guts of uxterm) when LANG and LC_ALL are en_US.UTF-8,
and not with either with en_US.ISO-8859-1.

-- System Information:
Debian Release: 3.1
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.7+mppe
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8

Versions of packages xterm depends on:
ii  libc6                     2.3.2.ds1-16   GNU C Library: Shared libraries an
ii  libexpat1                 1.95.6-8       XML parsing C library - runtime li
ii  libfontconfig1            2.2.3-1        generic font configuration library
ii  libfreetype6              2.1.7-2.2      FreeType 2 font engine, shared lib
ii  libice6                   4.3.0.dfsg.1-6 Inter-Client Exchange library
ii  libncurses5               5.4-4          Shared libraries for terminal hand
ii  libsm6                    4.3.0.dfsg.1-6 X Window System Session Management
ii  libxaw7                   4.3.0.dfsg.1-6 X Athena widget set library
ii  libxext6                  4.3.0.dfsg.1-6 X Window System miscellaneous exte
ii  libxft2                   2.1.2-6        FreeType-based font drawing librar
ii  libxmu6                   4.3.0.dfsg.1-6 X Window System miscellaneous util
ii  libxpm4                   4.3.0.dfsg.1-6 X pixmap library
ii  libxrender1               0.8.3-7        X Rendering Extension client libra
ii  libxt6                    4.3.0.dfsg.1-6 X Toolkit Intrinsics
ii  xlibs                     4.3.0.dfsg.1-6 X Window System client libraries m
ii  xlibs-data                4.3.0.dfsg.1-6 X Window System client data

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