The reason is probably because the patch is not a proper one but a workaround for a thunderbird bug, see the patch comment
"/* XXX: Work around https://launchpad.net/bugs/757976"; -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/757976 Title: Thunderbird attachment name changes cause send error To manage notifications about this bug go to: https://bugs.launchpad.net/nautilus-sendto/+bug/757976/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
