bug#7743: unrmail loses extra blank line at end of message

[Mark Lillibridge <mark.lillibridge@hp.com>]

    As of at least Emacs 23.1 and still present in version 24, unrmail
throws away the last blank line of a message if present.  The offending
code is in unrmail.el:

unrmail.el:235:
	    ;; Make sure the message ends with two newlines
	    (goto-char (point-max))
	    (unless (looking-back "\n\n")
	      (insert "\n"))

This is wrong!  Mbox format ends every message with a blank line, which
is not part of the message, so this code by failing to add the necessary
terminator blank line to messages that already end with a blank line
effectively removes the last blank line of such messages.


    The fix is easy: just always add the blank line like so:

unrmail.el:235:
	    ;; Add terminator blank line to message
	    (goto-char (point-max))
	    (insert "\n")


- Mark
PS, the patch for this change hopefully is:

ts-rhel5 [106]% diff original-unrmail.el new-unrmail.el
235c235
<           ;; Make sure the message ends with two newlines
---
>           ;; Add terminator blank line to message
237,238c237
<           (unless (looking-back "\n\n")
<             (insert "\n"))
---
>           (insert "\n")