Pascal Birchler 255819e18a Customize: Fix selective refresh when customizing the 404 template.
Overrides the 404 status during partial refresh requests to serve back 200 so that the request is not deemed a failure and invoke the fallback behavior (full refresh).

See #27355.
Fixes #40018.

Merges [40316] to the 4.7 branch.

Built from https://develop.svn.wordpress.org/branches/4.7@40366


git-svn-id: http://core.svn.wordpress.org/branches/4.7@40273 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2017-04-05 02:14:45 +00:00
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