This allows us to automatically retain selections when the library context is changed (e.g. when searching. This changes the Attachment view's select() and deselect() methods so that they can be triggered directly.
see #21390.
git-svn-id: http://core.svn.wordpress.org/trunk@21773 1a063a9b-81f0-0310-95a4-ce76da25c4cd