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* Arrow keys navigate between items in the grid. * Transfer focus into the panel when selecting a tab along the side. * Transfer focus into the details sidebar when selecting an item and vice versa. * Set initial focus on the close button so that it is visible. props celloexpressions, lessbloat, ericlewis. fixes #25100, #25101, #28704. see #23560. Built from https://develop.svn.wordpress.org/trunk@29220 git-svn-id: http://core.svn.wordpress.org/trunk@29004 1a063a9b-81f0-0310-95a4-ce76da25c4cd