Customizer: Better hover/focus state for section titles and available widgets.
The 4px border pattern is found in a number of places across the admin, including plugins, notices, and Press This. props celloexpressions, folletto, hugobaeta. see #29158. Built from https://develop.svn.wordpress.org/trunk@38602 git-svn-id: http://core.svn.wordpress.org/trunk@38545 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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