Allow preserving EXIF rotations when sending HTML messages

* lisp/gnus/mml.el (mml--possibly-alter-image): Allow image
rotation if you have exiftool installed and the image format
supports it.
(mml-expand-html-into-multipart-related): Use it.
(mml-buffer-substring-no-properties-except-some): Renamed and
copy display properties, too.

1 files changed, 7 insertions, 0 deletions

diff --git a/etc/NEWS b/etc/NEWS
index b2e42e3f91b..185b1a4f644 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -276,6 +276,13 @@ for the ChangeLog file, if none already exists.  Customize
 built-in IDNA support now).
 
 ---
+*** When sending HTML messages with embedded images, and you have
+exiftool installed, and you rotate images with EXIF data (i.e.,
+JPEGs), the rotational information will be inserted into the outgoing
+image in the message.  (The original image will not have its
+orientation affected.)
+
+---
 *** The 'message-valid-fqdn-regexp' variable has been removed, since
 there are now top-level domains added all the time.  Message will no
 longer warn about sending emails to top-level domains it hasn't heard