[kmail2] [Bug 369245] New: KMail 5.3.1: Attachments are included as plain text in forwarded or replied mails

[Till Schäfer via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=369245

            Bug ID: 369245
           Summary: KMail 5.3.1: Attachments are included as plain text in
                    forwarded or replied mails
           Product: kmail2
           Version: Git (master)
          Platform: Gentoo Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: composer
          Assignee: kdepim-bugs at kde.org
          Reporter: till2.schaefer at uni-dortmund.de

For some (not all) mails with (binary) attachments, the attachments are
included as plain text in forwarded or replied mails. 

A necessary condition seems to be, that the mail composer is using plain text.
If i reply an e-mail in html format, everything works as expected. The
configuration option "Reply or forward using HTML if present" therefore is a
workaround for this bug. 

Reproducible: Always

Steps to Reproduce:
1. Reply to or forward an email with an attachment in plain text format

Actual Results:  
The binary content is embedded in the E-Mail text

Expected Results:  
forward: the attachment stays an attachment
reply: the attachment is removed

here is an example header of a mail, that triggers the bug: 

Return-Path: <anonymized>
Received: from unimail.uni-dortmund.de ([unix socket])
     by unimail (Cyrus 2.5.9-8-g5134a9a.       0) with LMTPA;
     Sun, 11 Sep 2016 20:01:51 +0200
X-Sieve: CMU Sieve 2.4
Received: from esa4.itmc.tu-dortmund.de (esa4.itmc.tu-dortmund.de
[129.217.131.14])
    by unimail.uni-dortmund.de (8.16.0.19/8.16.0.19) with ESMTPS id
u8BI1pDr009825
    (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT)
    for <smtiscae at unimail.uni-dortmund.de>; Sun, 11 Sep 2016 20:01:51 +0200
(CEST)
IronPort-PHdr: =?us-ascii?q?9a23=3AdeRkehYbwerxYpmMF1jZqfD/LSx+4OfEezUN459i?=
 =?us-ascii?q?sYplN5qZpcS9bnLW6fgltlLVR4KTs6sC0LuP9f6/EjVbsN7B6ClEK80UEUddyI?=
 =?us-ascii?q?0/pE8JOIa9E0r1LfrnPWQRPf9pcxtbxUy9KlVfA83kZlff8TWY5D8WHQjjZ0Iu?=
 =?us-ascii?q?frymUrDbg8n/7e2u4ZqbO1wO32vkJ+0tZ0zt/E2R7pBQ2to6bP5pi1PgmThhQ6?=
 =?us-ascii?q?xu32RmJFaezV7Xx/yb29pdyRlWoO8r7MVaUK/3LOwSRL1cCyk6YShuvJW4/S/5?=
 =?us-ascii?q?YyDKo1EVXl4blAFJHwnb7Q3rFter6mqp/tZ6jRWbOcm+Gaw1XTD4qbxgSBblhi?=
 =?us-ascii?q?odHyIktW3QkNB1kaRX5h6s8U9R2YnRNZucMPQ7dKTQcd8XRmdbdtlcXWpND9Dv?=
 =?us-ascii?q?J7ATBvYMaL4L57L2oEED+EHmCA=3D=3D?=
X-IronPort-Anti-Spam-Filtered: true
X-IronPort-Anti-Spam-Result: =?us-ascii?q?A0G/AgC7m9VXhw4P49SERwEBAQEBuViCe?=
 =?us-ascii?q?xeHcQQCAQIBAQIQAQEBHgmCegQDGM4i61Q?=
X-IPAS-Result: =?us-ascii?q?A0G/AgC7m9VXhw4P49SERwEBAQEBuViCexeHcQQCAQIBAQI?=
 =?us-ascii?q?QAQEBHgmCegQDGM4i61Q?=
X-IronPort-AV: E=Sophos;i="5.30,318,1470693600"; 
   d="pdf'?rar'52?scan'52,208,217,52";a="158717687"
Received: from mout.web.de ([212.227.15.14])
  by esa4.itmc.tu-dortmund.de with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Sep
2016 20:01:21 +0200
Received: from [85.22.85.17] by 3capp-webde-bs64.server.lan (via HTTP); Sun,
 11 Sep 2016 20:01:21 +0200
MIME-Version: 1.0
Message-ID:
<trinity-3cb8a1a0-15f8-421a-8c9e-763880f38a79-1473616881217 at 3capp-webde-bs64>
From: anonymized
To: Till <till2.schaefer at tu-dortmund.de>
Subject: Ausdrucke
Content-Type: multipart/mixed;
 boundary=rekcebs-7e59eea0-b75e-4746-893a-09eff6b08356
Date: Sun, 11 Sep 2016 20:01:21 +0200
Importance: normal
Sensitivity: Normal
X-Priority: 3
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X-UI-Out-Filterresults: notjunk:1;V01:K0:DCd7m6feAFo=:1naEPQauOMJQdJCN/xGmMg
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--rekcebs-7e59eea0-b75e-4746-893a-09eff6b08356
Content-Type: text/html; charset=UTF-8

<html><head></head><body><div style="font-family: Verdana;font-size:
12.0px;"><div>Hi Till,</div>

<div> </div>

anonymized

<div> </div></div></body></html>
--rekcebs-7e59eea0-b75e-4746-893a-09eff6b08356
Content-Type: application/force-download
Content-Disposition: attachment; filename=Ausdrucke.rar
Content-Transfer-Encoding: base64

UmFyIRoHAM+QcwAADQAAAAAAAAApsXQgkFAABHABALGXAQACExemwl23KkkdMysAIAAAAEF1c2Ry

anonymized

EAAAAEF1c2RydWNrZQDwqklLxD17AEAHAA==
--rekcebs-7e59eea0-b75e-4746-893a-09eff6b08356--

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