Weston Ruter 48e726bbef Embeds: Improve consistency of update and refresh logic for oEmbed caching between oembed_cache and post meta.
* Allow updating oEmbed cache during `parse-embed` requests for non-post editors (such as widgets).
* Update any existing `oembed_cache` post when `usecache` and TTL has passed.
* Do not overwrite a previously valid cache with `{{unknown}}`.

Props dlh.
See #34115.
Fixes #42310.

Built from https://develop.svn.wordpress.org/trunk@42009


git-svn-id: http://core.svn.wordpress.org/trunk@41843 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2017-10-24 23:10:48 +00:00
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