Package: mutt
Version: 1.5.11+cvs20060403-1
Severity: normal

I am not sure if this is a bug in mutt, less, or the curses library and is 
posting this as a mutt bug for now. Please reassign as appropriate.

Within mutt, when piping a message to less(1), sometimes less produces a 
"staircase effect" with inverse text, like this:

------------------------ cut here ------------------------- 8< ----------------
                                                                                
                                                       "TIMEDOUT") by 
vaogate.cccgt.org with SMTP id S1517AbWFEHLc;
                                                                       Mon, 5 
Jun 2006 03:11:32 -0400
                                                                                
                     Received: by LISTSERV3.SPACE.COM (LISTSERV-TCP/IP release 
14.3) with spool id 8521821 for [EMAIL PROTECTED]; Mon, 0
                                                                                
                     5 Jun 2006 15:11:21 +0800
                                                                                
                                              From:   "bwnktthg lqfpcecm" 
<[EMAIL PROTECTED]>
                                           To:     <[EMAIL PROTECTED]>
                                                                        
Subject: [spam subject removed]
   Date:   Mon, 05 Jun 2006 15:11:21 +0800
                                          Message-Id: <[EMAIL PROTECTED]>
                                                                                
             MIME-Version: 1.0
                                                                                
                              Content-Type: multipart/related;
             boundary="pst7133e1mjjcr2z690n"
                                            Return-Path: <[EMAIL PROTECTED]>

                                                                              
This is a multi-part message in MIME format.

                                                                                
                                          --pst7133e1mjjcr2z690n
            Content-Type: multipart/alternative;
                                                        
boundary="KJTFRYDOBFLGDZXWUVAX"

                                                                                
       --KJTFRYDOBFLGDZXWUVAX
:
------------------------ cut here ------------------------- 8< ----------------

If I instead pipe the message to "cat|less" (instead of just "less"), the 
output becomes normal.

This only happens intermittently but it happens quite often; unfortunately I 
have not seen a pattern how this can be triggered.

-- System Information:
Debian Release: testing/unstable
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'stable')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.4.28-ow1
Locale: LANG=zh_TW.Big5, LC_CTYPE=zh_TW.Big5 (charmap=BIG5)

Versions of packages mutt depends on:
ii  libc6                   2.3.6-13         GNU C Library: Shared libraries
ii  libdb4.4                4.4.20-4         Berkeley v4.4 Database Libraries [
ii  libgnutls12             1.2.9-2.1        the GNU TLS library - runtime libr
ii  libidn11                0.5.18-2         GNU libidn library, implementation
ii  libncursesw5            5.5-2            Shared libraries for terminal hand
ii  libsasl2                2.1.19.dfsg1-0.2 Authentication abstraction library
ii  zmailer [mail-transport 2.99.56-2        Mailer for Extreme Performance Dem

Versions of packages mutt recommends:
ii  locales                       2.3.6-13   GNU C Library: National Language (
ii  mime-support                  3.36-1     MIME files 'mime.types' & 'mailcap

-- no debconf information


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