Weston Ruter 277d4d0ab0 Customize: Prevent selective refresh from causing infinite fallback refreshes when nav menu contains invalid items.
Invalid nav menu items are exported as settings in the customize controls since it `is_admin()`, but any such `nav_menu_item` settings are excluded from the preview since it's the frontend. Selective refresh for nav menus needs to ignore the syncing of any such `nav_menu_item` settings that are `_invalid` since they are never rendered, and when a nav menu only contains invalid items, an infinite fallback refresh can ensue.

Fixes #38890.

Built from https://develop.svn.wordpress.org/trunk@39333


git-svn-id: http://core.svn.wordpress.org/trunk@39273 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2016-11-21 19:16:32 +00:00
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