[gmime] block/unblock changed event in g_mime_object_set_content_id()

[Jeffrey Stedfast <fejj src gnome org>]

commit 684df5568e3d08ddf677ecd0669b843af0bf3811
Author: Jeffrey Stedfast <fejj gnome org>
Date:   Sun Mar 12 16:02:50 2017 -0400

    block/unblock changed event in g_mime_object_set_content_id()

 gmime/gmime-object.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/gmime/gmime-object.c b/gmime/gmime-object.c
index 5a1a2b4..05ace4c 100644
--- a/gmime/gmime-object.c
+++ b/gmime/gmime-object.c
@@ -867,7 +867,9 @@ g_mime_object_set_content_id (GMimeObject *object, const char *content_id)
        object->content_id = g_strdup (content_id);
        
        msgid = g_strdup_printf ("<%s>", content_id);
-       g_mime_object_set_header (object, "Content-Id", msgid);
+       _g_mime_object_block_header_list_changed (object);
+       g_mime_header_list_set (object->headers, "Content-Id", msgid);
+       _g_mime_object_unblock_header_list_changed (object);
        g_free (msgid);
 }