master f025005e86 1/2: Fix double-encoding attachment headers in single-part rfc2047

[Lars Ingebrigtsen]

branch: master
commit f025005e8619ab42b43dad5dd470dbbbcdc75041
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Fix double-encoding attachment headers in single-part rfc2047
    
    * lisp/mail/rfc2047.el (rfc2047-header-encoding-alist): Don't
    double-encode Content-Disposition in mails with no other body
    (bug#56906).
---
 lisp/mail/rfc2047.el | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lisp/mail/rfc2047.el b/lisp/mail/rfc2047.el
index bb0d646346..67874d508b 100644
--- a/lisp/mail/rfc2047.el
+++ b/lisp/mail/rfc2047.el
@@ -45,6 +45,9 @@
   '(("Newsgroups" . nil)
     ("Followup-To" . nil)
     ("Message-ID" . nil)
+    ;; This header must be pre-encoded by the MTA, so avoid
+    ;; double-encoding it.
+    ("Content-Disposition" . default)
     ("\\(Resent-\\)?\\(From\\|Cc\\|To\\|Bcc\\|\\(In-\\)?Reply-To\\|Sender\
 
\\|Mail-Followup-To\\|Mail-Copies-To\\|Approved\\|Disposition-Notification-To\\)"
 . address-mime)
     (t . mime))