See #47771. Built from https://develop.svn.wordpress.org/trunk@45677 git-svn-id: http://core.svn.wordpress.org/trunk@45488 1a063a9b-81f0-0310-95a4-ce76da25c4cd
wp-admin/custom-header.php
wp-admin/includes/class-custom-image-header.php
Squiz.PHP.DisallowMultipleAssignments
wp-includes
@type
WP_Customize_Selective_Refresh::$current_partial_id