+ - Prevent right_frame to be set to '//www.example.com'.
+ - Tweak printer friendly attachment view.
+ - Added new compose_send_after hook.
+ - Added new scheme to allow multiple plugins to share the onsubmit handler
+ for the compose form from the compose_form hook. See plugin.txt for more
+ information.
+ - Support for LIST-SUBSCRIBED extension. This speeds up the retrieval of
+ the subscribed mailbox-list.
+ - Properly clean up temporary attachment files when saving as Draft
+ (#1358407) and fix attachment cleaning code on logout.