noisysocks a3c8b3ddea Customize: Ensure multiple CSS classes are passed to nav_menu_link_attributes as an array
When multiple CSS classes are added to a menu item, the nav_menu_link_attributes
filter should be called with $item->classes set to an array of CSS class names.

When previewing in the Customizer, however, a single string was being passed to
$item->classes because WP_Customize_Nav_Menu_Item_Setting::preview() bypasses
wp_update_nav_menu_item() and instead uses filter_wp_get_nav_menu_items().

The fix is to make filter_wp_get_nav_menu_items() match what
wp_update_nav_menu_item() does and split the string into an array.

Fixes #43113.
Props dlh.

Built from https://develop.svn.wordpress.org/trunk@49624


git-svn-id: http://core.svn.wordpress.org/trunk@49362 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-11-17 04:31:08 +00:00
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