Re-encode message bodies with externalized attachments during FCC

Bug#70338

* lisp/gnus/message.el (message-do-fcc): If the user has requested to
externalize attachments, we can't use the cached version of the message
body from sending. This mirrors an equivalent check for GCC in
`gnus-inews-do-gcc'.

1 files changed, 4 insertions, 2 deletions

diff --git a/lisp/gnus/message.el b/lisp/gnus/message.el
index 979d2fecf56..b2805774162 100644
--- a/lisp/gnus/message.el
+++ b/lisp/gnus/message.el
@@ -5768,8 +5768,10 @@ The result is a fixnum."
       (with-temp-buffer
         (insert-buffer-substring buf)
         (message-clone-locals buf)
-        ;; Avoid re-doing things like GPG-encoding secret parts.
-        (if (not encoded-cache)
+        ;; Avoid re-doing things like GPG-encoding secret parts, unless
+        ;; the user has requested that attachments be externalized, in
+        ;; which case we have to re-encode the message body.
+        (if (or mml-externalize-attachments (not encoded-cache))
             (message-encode-message-body)
           (erase-buffer)
           (insert encoded-cache))