Widget Customizer: Fix incorrect replacement in [27995].

props westonruter.
fixes #27690.

Built from https://develop.svn.wordpress.org/trunk@28034


git-svn-id: http://core.svn.wordpress.org/trunk@27864 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Installer: Use 'browse' instead of 'sort' for routes.

see #27055.

Built from https://develop.svn.wordpress.org/trunk@28035


git-svn-id: http://core.svn.wordpress.org/trunk@27865 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Installer: Left/right arrow keys in the overlay.

props adamsilverstein.
see #27521.

Built from https://develop.svn.wordpress.org/trunk@28036


git-svn-id: http://core.svn.wordpress.org/trunk@27866 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Installer: Combine 'Layout' and 'Columns' filters so 'Features' can span two columns.

see #27055.

Built from https://develop.svn.wordpress.org/trunk@28037


git-svn-id: http://core.svn.wordpress.org/trunk@27867 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Theme Installer: Show 'Preview' button for installed themes.

props adamsilverstein.
see #27055, see #27708.

Built from https://develop.svn.wordpress.org/trunk@28038


git-svn-id: http://core.svn.wordpress.org/trunk@27868 1a063a9b-81f0-0310-95a4-ce76da25c4cd