[PATCH v2 2/4] emacs/show: save redisplay redisplay data when showing lazy part.

[David Bremner <david@tethera.net>]

This data will be used to redisplay an image that is hidden by
deleting it from the buffer.  We cannot easily delay until the image
is hidden, as we won't have the original data at that point.
---
 emacs/notmuch-show.el | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 36cce619..107ce1b8 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -1019,10 +1019,13 @@ will return nil if the CID is unknown or cannot be retrieved."
 	   (part-end (copy-marker (point) t))
 	   ;; We have to save the depth as we can't find the depth
 	   ;; when narrowed.
-	   (depth (notmuch-show-get-depth)))
+	   (depth (notmuch-show-get-depth))
+	   (mime-type (plist-get (cadr part-args) :computed-type)))
       (save-restriction
 	(narrow-to-region part-beg part-end)
 	(delete-region part-beg part-end)
+	(when (and mime-type (string-match "^image/" mime-type))
+	  (button-put button :notmuch-redisplay-data part-args))
 	(apply #'notmuch-show-insert-bodypart-internal part-args)
 	(indent-rigidly part-beg
 			part-end
-- 
2.40.1