bug#7651: 23.2.91; Rmail doesn't allow displaying text attachments conveniently

[Eli Zaretskii]

The new Rmail-MIME feature is nice, but it has some rough edges.  One
of them is that I lost an easy way of displaying many text
attachments.

Specifically, it looks like we display text attachments by default,
but only if content-disposition is "inline".  Maybe that's what the
various RFCs mandate, but why isn't there at least a button to display
the text (in the same or another buffer) if the user decides to do
that?  Previously, if I trusted the sender and the contents, I could
type `e', then decode the attachment manually, and "C-c C-c" to read
it as part of the message.  Now I can only save the attachment to a
file and visit it -- an inconvenience.  For someone who gets to review
patches, this is a serious inconvenience, especially since `v' does
not seem to work anymore in the Rmail buffer.

Also, there's something strange in the way we treat text/x-patch
attachments as text.  rmailmm.el has these 2 lines:

    ("text/.*" rmail-mime-text-handler)
    ("text/\\(x-\\)?patch" rmail-mime-bulk-handler)

which to my interpretation mean that the second line will never be
used, right?


In GNU Emacs 23.2.91.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.12.9)
 of 2010-12-11 on fencepost
configured using `configure  '--with-jpeg=no' '--with-gif=no' '--with-tiff=no''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  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: nil
  value of $XMODIFIERS: nil
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: RMAIL

Minor modes in effect:
  display-time-mode: t
  show-paren-mode: t
  savehist-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t

Recent input:
ESC O A ESC O A ESC O A ESC O A ESC O A ESC O A ESC 
O A ESC O A ESC O A ESC O A ESC O B ESC O C ESC O C 
ESC O C ESC O C ESC O C ESC O C ESC O C C-r C-w C-w 
C-w C-w C-r C-x C-x C-s C-s C-s ESC O A C-x C-x C-r 
C-r ESC O A ESC O A ESC O D ESC O D ESC O D ESC O D 
C-s C-w C-w C-w C-w C-w C-w C-s C-s C-s C-x C-x C-s 
C-s C-s ESC O q ESC O A ESC O A C-x C-_ ESC O A C-_ 
C-x b RET ESC p ESC p ESC p ESC p ESC p ESC p ESC p 
ESC p ESC p ESC p ESC p ESC p ESC p ESC p SPC SPC SPC 
SPC ESC p ESC p SPC ESC p ESC n ESC p ESC p SPC ESC 
p ESC p ESC p ESC p SPC ESC p SPC ESC p SPC ESC p SPC 
SPC ESC p ESC p ESC p ESC p SPC ESC p SPC ESC p ESC 
p ESC p ESC p SPC SPC ESC p ESC p SPC SPC ESC p ESC 
p ESC p ESC p SPC SPC ESC p SPC SPC SPC ESC p ESC p 
SPC ESC p SPC SPC SPC ESC p ESC p SPC SPC ESC p ESC 
p ESC p ESC p ESC p ESC p ESC p n d ESC p p p SPC p 
p SPC p SPC p p p p p p p SPC C-x o ESC > C-x o ESC 
x r e p o r t - e m TAB RET

Recent messages:
Making completion list...
Mark set
Mark saved where search started [9 times]
Undo!
call-interactively: End of buffer [3 times]
Showing message 1124
Showing message 1124...done
Showing message 1124
Showing message 1124...done
Mark set

Load-path shadows:
None found.

Features:
(shadow emacsbug help-mode view two-column dabbrev newcomment flyspell
ispell etags ring vc-bzr cc-mode cc-fonts cc-menus cc-cmds cc-styles
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cus-face files text-properties overlay md5 base64 format env
code-pages mule custom widget hashtable-print-readable backquote
make-network-process font-render-setting gtk x-toolkit x multi-tty
emacs)