[Tickets #12763] "BAD signature" message appears when verifying a PGP signed HTML message with attachment

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Ticket URL: http://bugs.horde.org/ticket/12763
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  Ticket             | 12763
  Created By         | tokimemofan at gmail.com
  Summary            | "BAD signature" message appears when verifying a PGP
                     | signed HTML message with attachment
  Queue              | Horde Groupware Webmail Edition
  Version            | 5.1.2
  Type               | Bug
  State              | Unconfirmed
  Priority           | 3. High
  Milestone          |
  Patch              |
  Owners             |
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tokimemofan at gmail.com (2013-10-15 11:18) wrote:

Today I install a clean Horde Webmail 5.1.2, and all components are  
the latest stable version.
I find that Horde_Stream_Filter 2.0.2 mostly fix the Bug #12673, but  
does not fix the case at "HTML message + Attachment + PGP signed".

1. Write a mail with HTML composition.
2. Add an attachment. I tried JPG/MP3 file.
3. Select encryption option to PGP sign message.
4. Send this message.
5. Verify this message, and "BAD signature" message appears.

OS: Ubuntu server 12.04.3 64-bit (update all packages today)
GnuPG: 1.4.11
PHP: 5.3.10-1ubuntu3.8
MySQL: 5.5.32-0ubuntu0.12.04.1