Props shahpranaf, TacoVerdo, afercia. Fixes #36562. Built from https://develop.svn.wordpress.org/trunk@37229 git-svn-id: http://core.svn.wordpress.org/trunk@37195 1a063a9b-81f0-0310-95a4-ce76da25c4cd
WP_Customize_Partial
WP_Customize_Selective_Refresh->$manager