Why does zypper patch not patch Thunderbird? For example, Thunderbird 31.1 contained security patches, but these were not installed by zypper patch, only by zypper update.

Name : MozillaThunderbird
Version : 31.1.0
Release : 3.1
Architecture: x86_64
Install Date: Wed Sep 3 04:57:53 2014
Group : Productivity/Networking/Email/Clients
Size : 69568433
License : MPL-2.0
Signature : DSA/SHA1, Wed Sep 3 00:55:44 2014, Key ID 026b47f3766da614
Source RPM : MozillaThunderbird-31.1.0-3.1.src.rpm
Build Date : Wed Sep 3 00:29:38 2014
Build Host : cloud129
Relocations : (not relocatable)
Vendor : obs://build.opensuse.org/mozilla
URL : http://www.mozilla.org/products/thunderbird/
Summary : The Stand-Alone Mozilla Mail Component